What is the general information and testing procedure for relays on Ford F-150?

Various electrical gadgets in the vehicle for instance relevant injection system, horns, starter and the fog lamps employ relays to send an electrical signal to the component. Relay controls the low current control circuit to govern the high current power circuit, and when the relay is faulty the particular device cannot function as required. Bulk of relays can be found at the fuse and relay box and if a relay is deemed abnormal it can be taken out for testing or better yet to the dealer service department as all bad relays should be replaced. The relays mainly in use are the ISO relays in which the provision for the circuit connections has been numbered and each having its specific function. Two of the pins are used for the control circuit that connects to the relay coil, the rest are pins in the power circuit. When energised the coil produces a magnetic field to close the larger contacts of the power circuitry to supply power to the loads. Normally terminals 85 and 86 are for the control circuit definite connection is necessary if Diode or Resistor is provided is provided. Terminal 30 allows the battery voltage to be connected , while terminal 87 connects to the ground of the circuit in question. In the testing of the relay, the sensitivity can be checked by measuring the resistance through the control coil and comparing it with the correct resistance in both directions. In the same way, it is permissible for the continuity between terminal 30 and 87 to be disrupted when the relay is without energy. Jumper wires should be connected to the proper terminal and the battery to check if the relay made a clicking sound; continuity test should also be performed and the power circuit terminals are should also be tested. If any of these tests show failure the relay should be changed.

Genuine Ford F-150 Relay

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44 Relays found

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Ford F-150 Relay
Part Number: FOAZ-14N089-A
$16.62 MSRP: $25.00
You Save: $8.38 (34%)
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Product Specifications
- Replaced by: 5M5Z-14N089-A
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1992-2014 Ford F-150 | 6 Cyl 3.5L DOHC TIVCT, 6 Cyl 3.7L PFI NA, 6 Cyl 3.8L, 6 Cyl 4.2L, 6 Cyl 4.2L OHV EFI, 6 Cyl 4.9L, 8 Cyl 4.6L, 8 Cyl 4.6L Romeo SOHC EFI, 8 Cyl 4.6L Windsor SOHC EFI, 8 Cyl 5.0L, 8 Cyl 5.0L MOD DOHC SEFI NA, 8 Cyl 5.4L, 8 Cyl 5.8L, 8 Cyl 6.2L OHC NA | 3AT C6, 4AT, 4AT 4R100, 4AT 4R70W, 4AT 4R75W, 4AT AOD, 4AT E4OD, 4MT, 4-Speed Automatic Transmission 4R75E Livonia, 4-Speed Automatic Transmission AODEW/4R70E W/TSS, 4-Speed Automatic Transmission AODEW/4R75E W/TSS, 5MT, 5-Speed Manual Transmission - Mazda M5R2-C, 6-Speed Automatic Transmission (6R80), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Ford F-150 Relay
Part Number: 8T2Z-14N089-B
$40.60 MSRP: $59.83
You Save: $19.23 (33%)
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Product Specifications
- Replaced by: GU5Z-14N089-B
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2015-2019 Ford F-150 | 6 Cyl 2.7L, 6 Cyl 3.0L 4V DOHC TC DSL-LION B , 6 Cyl 3.3L Duratec, 6 Cyl 3.5L Cyclone Petrol TIVCT, 6 Cyl 3.5L GTDI, 8 Cyl 5.0L Coyote, 8 Cyl 5.0L MOD DOHC SEFI NA | 10-Speed Automatic Transmission (10R80), 6-Speed Automatic Transmission (6R80), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Ford F-150 RELAY
Part Number: HU5Z-14N089-B
$24.34 MSRP: $35.00
You Save: $10.66 (31%)
Ships in 1 Business Day
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Product Specifications
- Replaces: 8T2Z-14N089-C, 5L3Z-14N089-AA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2020 Ford F-150 | 6 Cyl 2.7 L GAS, 6 Cyl 3.0 L DIESEL, 6 Cyl 3.3 L FLEX, 6 Cyl 3.5 L GAS, 8 Cyl 5.0 L FLEX
- 2004-2014 Ford F-150 | 6 Cyl 3.5L DOHC TIVCT, 6 Cyl 3.7L PFI NA, 6 Cyl 4.2L OHV EFI, 8 Cyl 4.6L, 8 Cyl 4.6L Romeo SOHC EFI, 8 Cyl 4.6L Windsor SOHC EFI, 8 Cyl 5.0L MOD DOHC SEFI NA, 8 Cyl 5.4L, 8 Cyl 6.2L OHC NA | 4-Speed Automatic Transmission 4R75E Livonia, 4-Speed Automatic Transmission AODEW/4R70E W/TSS, 4-Speed Automatic Transmission AODEW/4R75E W/TSS, 5-Speed Manual Transmission - Mazda M5R2-C, 6-Speed Automatic Transmission (6R80), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Ford F-150 Direction Indicator Relay
Part Number: 5L3Z-13350-AA
$48.95 MSRP: $80.91
You Save: $31.96 (40%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Relay - Direction Indicator; Flasher, Flasher Relay
- Manufacturer Note: Flasher Assy
- Replaces: 4L3Z-13350-AA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2004-2014 Ford F-150 | 6 Cyl 3.5L DOHC TIVCT, 6 Cyl 3.7L PFI NA, 6 Cyl 4.2L OHV EFI, 8 Cyl 4.6L, 8 Cyl 4.6L Romeo SOHC EFI, 8 Cyl 4.6L Windsor SOHC EFI, 8 Cyl 5.0L MOD DOHC SEFI NA, 8 Cyl 5.4L, 8 Cyl 6.2L OHC NA | 4-Speed Automatic Transmission 4R75E Livonia, 4-Speed Automatic Transmission AODEW/4R70E W/TSS, 4-Speed Automatic Transmission AODEW/4R75E W/TSS, 5-Speed Manual Transmission - Mazda M5R2-C, 6-Speed Automatic Transmission (6R80), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Ford F-150 Relay
Part Number: 8T2Z-14N089-D
$35.72 MSRP: $38.00
You Save: $2.28 (6%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Manufacturer Note: 40 AMP
- Replaced by: GU5Z-14N089-A
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2019 Ford F-150 | 6 Cyl 2.7L, 6 Cyl 3.0L 4V DOHC TC DSL-LION B, 6 Cyl 3.3L Duratec, 6 Cyl 3.5L GTDI, 8 Cyl 5.0L Coyote | 10-Speed Automatic Transmission (10R80), 6-Speed Automatic Transmission (6R80), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
- 2011-2014 Ford F-150 | 6 Cyl 3.5L DOHC TIVCT, 6 Cyl 3.7L PFI NA, 8 Cyl 4.6L, 8 Cyl 5.0L MOD DOHC SEFI NA, 8 Cyl 6.2L OHC NA | 4-Speed Automatic Transmission 4R75E Livonia, 4-Speed Automatic Transmission AODEW/4R70E W/TSS, 4-Speed Automatic Transmission AODEW/4R75E W/TSS, 5-Speed Manual Transmission - Mazda M5R2-C, 6-Speed Automatic Transmission (6R80), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Ford F-150 Relay
Part Number: 5L3Z-14N089-AA
$24.34 MSRP: $35.00
You Save: $10.66 (31%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Replaced by: HU5Z-14N089-B
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2004-2014 Ford F-150 | 6 Cyl 3.5L DOHC TIVCT, 6 Cyl 3.7L PFI NA, 6 Cyl 4.2L OHV EFI, 8 Cyl 4.6L, 8 Cyl 4.6L Romeo SOHC EFI, 8 Cyl 4.6L Windsor SOHC EFI, 8 Cyl 5.0L MOD DOHC SEFI NA, 8 Cyl 5.4L, 8 Cyl 6.2L OHC NA | 4-Speed Automatic Transmission 4R75E Livonia, 4-Speed Automatic Transmission AODEW/4R70E W/TSS, 4-Speed Automatic Transmission AODEW/4R75E W/TSS, 5-Speed Manual Transmission - Mazda M5R2-C, 6-Speed Automatic Transmission (6R80), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Ford F-150 Relay
Part Number: 8L8Z-14N089-A
$29.21 MSRP: $38.00
You Save: $8.79 (24%)
ADD TO CART
Product Specifications
- Replaced by: GU5Z-14N089-A
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2004-2014 Ford F-150 | 6 Cyl 3.5L DOHC TIVCT, 6 Cyl 3.7L PFI NA, 6 Cyl 4.2L OHV EFI, 8 Cyl 4.6L, 8 Cyl 4.6L Romeo SOHC EFI, 8 Cyl 4.6L Windsor SOHC EFI, 8 Cyl 5.0L MOD DOHC SEFI NA, 8 Cyl 5.4L, 8 Cyl 6.2L OHC NA | 4-Speed Automatic Transmission 4R75E Livonia, 4-Speed Automatic Transmission AODEW/4R70E W/TSS, 4-Speed Automatic Transmission AODEW/4R75E W/TSS, 5-Speed Manual Transmission - Mazda M5R2-C, 6-Speed Automatic Transmission (6R80), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Ford F-150 Starter Motor Relay Assy
Part Number: E9TZ-11450-B
$24.97 MSRP: $39.82
You Save: $14.85 (38%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Relay Assy - Starter Motor
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1989-2004 Ford F-150 | 6 Cyl 3.8L, 6 Cyl 4.2L, 6 Cyl 4.9L, 8 Cyl 4.6L, 8 Cyl 5.0L, 8 Cyl 5.4L, 8 Cyl 5.8L | 3AT C6, 3MT, 4AT, 4AT 4R100, 4AT 4R70W, 4AT 4R75W, 4AT AOD, 4AT E4OD, 4MT, 5MT
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Ford F-150 Relay
Part Number: F8OZ-14N089-AA
$24.10 MSRP: $34.33
You Save: $10.23 (30%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2004-2014 Ford F-150 | 6 Cyl 3.5L DOHC TIVCT, 6 Cyl 3.7L PFI NA, 6 Cyl 4.2L OHV EFI, 8 Cyl 4.6L, 8 Cyl 4.6L Romeo SOHC EFI, 8 Cyl 4.6L Windsor SOHC EFI, 8 Cyl 5.0L MOD DOHC SEFI NA, 8 Cyl 5.4L, 8 Cyl 6.2L OHC NA | 4-Speed Automatic Transmission 4R75E Livonia, 4-Speed Automatic Transmission AODEW/4R70E W/TSS, 4-Speed Automatic Transmission AODEW/4R75E W/TSS, 5-Speed Manual Transmission - Mazda M5R2-C, 6-Speed Automatic Transmission (6R80), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Ford F-150 Direction Indicator Relay
Part Number: F65Z-13350-AA
$26.11 MSRP: $41.64
You Save: $15.53 (38%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Relay - Direction Indicator
- Replaced by: 5C3Z-13350-AA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1997-2004 Ford F-150 | 6 Cyl 4.2L, 6 Cyl 4.9L, 8 Cyl 4.6L, 8 Cyl 5.4L | 4AT, 4AT 4R100, 4AT 4R70W, 4AT E4OD, 5MT
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Ford F-150 Relay
Part Number: F5TZ-14N089-B
$9.57 MSRP: $13.63
You Save: $4.06 (30%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Horn Relay, Sentinel Relay, Wiper Relay
- Replaced by: 5M5Z-14N089-BA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1997-2014 Ford F-150 | 6 Cyl 3.5L DOHC TIVCT, 6 Cyl 3.7L PFI NA, 6 Cyl 4.2L, 6 Cyl 4.2L OHV EFI, 6 Cyl 4.9L, 8 Cyl 4.6L, 8 Cyl 4.6L Romeo SOHC EFI, 8 Cyl 4.6L Windsor SOHC EFI, 8 Cyl 5.0L MOD DOHC SEFI NA, 8 Cyl 5.4L, 8 Cyl 6.2L OHC NA | 4AT, 4AT 4R100, 4AT 4R70W, 4AT E4OD, 4-Speed Automatic Transmission 4R75E Livonia, 4-Speed Automatic Transmission AODEW/4R70E W/TSS, 4-Speed Automatic Transmission AODEW/4R75E W/TSS, 5MT, 5-Speed Manual Transmission - Mazda M5R2-C, 6-Speed Automatic Transmission (6R80), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Ford F-150 Relay
Part Number: 5C3Z-14N089-A
$16.38 MSRP: $23.33
You Save: $6.95 (30%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Replaced by: 5M5Z-14N089-CA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2004 Ford F-150 | 8 Cyl 4.6L Romeo SOHC EFI, 8 Cyl 4.6L Windsor SOHC EFI, 8 Cyl 5.4L | 4-Speed Automatic Transmission 4R75E Livonia, 4-Speed Automatic Transmission AODEW/4R70E W/TSS, 4-Speed Automatic Transmission AODEW/4R75E W/TSS, Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Ford F-150 Relay
Part Number: 4F1Z-14N089-BA
$16.38 MSRP: $23.33
You Save: $6.95 (30%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Replaced by: 5M5Z-14N089-CA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2014 Ford F-150 | 6 Cyl 3.5L DOHC TIVCT, 6 Cyl 3.7L PFI NA, 6 Cyl 4.2L OHV EFI, 8 Cyl 4.6L, 8 Cyl 4.6L Romeo SOHC EFI, 8 Cyl 4.6L Windsor SOHC EFI, 8 Cyl 5.0L MOD DOHC SEFI NA, 8 Cyl 5.4L, 8 Cyl 6.2L OHC NA | 4-Speed Automatic Transmission 4R75E Livonia, 4-Speed Automatic Transmission AODEW/4R70E W/TSS, 4-Speed Automatic Transmission AODEW/4R75E W/TSS, 5-Speed Manual Transmission - Mazda M5R2-C, 6-Speed Automatic Transmission (6R80), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Ford F-150 Relay
Part Number: 5M5Z-14N089-EA
$20.71 MSRP: $29.50
You Save: $8.79 (30%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2021-2023 Ford F-150 | 6 Cyl 3.5 L FULL HYBRID EV-GAS (FHEV)
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Ford F-150 Exterior Rear View Mirror Relay
Part Number: 8C3Z-14N089-A
$68.40 MSRP: $100.00
You Save: $31.60 (32%)
ADD TO CART
Product Specifications
- Other Name: Relay - Exterior Rear View Mirror; Relay
- Position: Rear
- Replaces: 7C3Z-14N089-C
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2007-2014 Ford F-150 | 6 Cyl 3.5L DOHC TIVCT, 6 Cyl 3.7L PFI NA, 6 Cyl 4.2L OHV EFI, 8 Cyl 4.6L, 8 Cyl 4.6L Romeo SOHC EFI, 8 Cyl 4.6L Windsor SOHC EFI, 8 Cyl 5.0L MOD DOHC SEFI NA, 8 Cyl 5.4L, 8 Cyl 6.2L OHC NA | 4-Speed Automatic Transmission 4R75E Livonia, 4-Speed Automatic Transmission AODEW/4R70E W/TSS, 4-Speed Automatic Transmission AODEW/4R75E W/TSS, 5-Speed Manual Transmission - Mazda M5R2-C, 6-Speed Automatic Transmission (6R80), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
View related parts
Ford F-150 Relay
Part Number: 4F1Z-14N089-AA
$9.57 MSRP: $13.63
You Save: $4.06 (30%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Replaced by: 5M5Z-14N089-BA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2004-2014 Ford F-150 | 6 Cyl 3.5L DOHC TIVCT, 6 Cyl 3.7L PFI NA, 6 Cyl 4.2L OHV EFI, 8 Cyl 4.6L, 8 Cyl 4.6L Romeo SOHC EFI, 8 Cyl 4.6L Windsor SOHC EFI, 8 Cyl 5.0L MOD DOHC SEFI NA, 8 Cyl 5.4L, 8 Cyl 6.2L OHC NA | 4-Speed Automatic Transmission 4R75E Livonia, 4-Speed Automatic Transmission AODEW/4R70E W/TSS, 4-Speed Automatic Transmission AODEW/4R75E W/TSS, 5-Speed Manual Transmission - Mazda M5R2-C, 6-Speed Automatic Transmission (6R80), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
View related parts
Ford F-150 RELAY
Part Number: GU5Z-14N089-B
$45.99 MSRP: $59.83
You Save: $13.84 (24%)
ADD TO CART
Product Specifications
- Other Name: Fuel Pump Relay
- Replaces: 8T2Z-14N089-B, 8L8Z-14N089-B
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2009-2020 Ford F-150 | 6 Cyl 2.7 L GAS, 6 Cyl 2.7L, 6 Cyl 3.0 L DIESEL, 6 Cyl 3.0L 4V DOHC TC DSL-LION B, 6 Cyl 3.3 L FLEX, 6 Cyl 3.3L Duratec, 6 Cyl 3.5 L GAS, 6 Cyl 3.5L Cyclone Petrol TIVCT, 6 Cyl 3.5L DOHC TIVCT, 6 Cyl 3.5L GTDI, 6 Cyl 3.7L PFI NA, 8 Cyl 4.6L, 8 Cyl 4.6L Romeo SOHC EFI, 8 Cyl 5.0 L FLEX, 8 Cyl 5.0L Coyote, 8 Cyl 5.0L MOD DOHC SEFI NA, 8 Cyl 5.4L, 8 Cyl 6.2L OHC NA | 10-Speed Automatic Transmission (10R80), 4-Speed Automatic Transmission 4R75E Livonia, 4-Speed Automatic Transmission AODEW/4R70E W/TSS, 4-Speed Automatic Transmission AODEW/4R75E W/TSS, 5-Speed Manual Transmission - Mazda M5R2-C, 6-Speed Automatic Transmission (6R80), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
View related parts
Ford F-150 Direction Indicator Relay
Part Number: 4L3Z-13350-AA
$48.95 MSRP: $80.91
You Save: $31.96 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Relay - Direction Indicator
- Manufacturer Note: Flasher Assy
- Replaced by: 5L3Z-13350-AA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2004-2005 Ford F-150 | 6 Cyl 4.2L OHV EFI, 8 Cyl 4.6L Romeo SOHC EFI, 8 Cyl 4.6L Windsor SOHC EFI, 8 Cyl 5.4L | 4-Speed Automatic Transmission 4R75E Livonia, 4-Speed Automatic Transmission AODEW/4R70E W/TSS, 4-Speed Automatic Transmission AODEW/4R75E W/TSS, 5-Speed Manual Transmission - Mazda M5R2-C, Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
View related parts
Ford F-150 Direction Indicator Relay
Part Number: YL3Z-13350-AA
$32.72 MSRP: $52.18
You Save: $19.46 (38%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Relay - Direction Indicator
- Replaced by: 2L1Z-13350-AA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2000-2004 Ford F-150 | 6 Cyl 4.2L, 8 Cyl 4.6L, 8 Cyl 5.4L | 4AT, 4AT 4R100, 4AT 4R70W, 5MT
View related parts
Ford F-150 Relay
Part Number: D2LY-14512-A
$45.85 MSRP: $63.70
You Save: $17.85 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1980-1982 Ford F-150 | 6 Cyl 4.9L, 8 Cyl 5.0L, 8 Cyl 5.8L | 3AT C6, 3MT, 4MT

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Ford F-150 Relay

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Ford F-150 Relay Parts Questions & Experts Answers

Exterior Rear View Mirror Relay
1S7Z-14N089-AA
Q: What is the general information and testing procedure for relays on Ford F-150?
A: Various electrical gadgets in the vehicle for instance relevant injection system, Horns, starter and the fog lamps employ relays to send an electrical signal to the component. Relay controls the low current control circuit to govern the high current power circuit, and when the relay is faulty the particular device cannot function as required. Bulk of relays can be found at the fuse and relay box and if a relay is deemed abnormal it can be taken out for testing or better yet to the dealer service department as all bad relays should be replaced. The relays mainly in use are the ISO relays in which the provision for the circuit connections has been numbered and each having its specific function. Two of the pins are used for the control circuit that connects to the relay coil, the rest are pins in the power circuit. When energised the coil produces a magnetic field to close the larger contacts of the power circuitry to supply power to the loads. Normally terminals 85 and 86 are for the control circuit definite connection is necessary if Diode or Resistor is provided is provided. Terminal 30 allows the battery voltage to be connected , while terminal 87 connects to the ground of the circuit in question. In the testing of the relay, the sensitivity can be checked by measuring the resistance through the control coil and comparing it with the correct resistance in both directions. In the same way, it is permissible for the continuity between terminal 30 and 87 to be disrupted when the relay is without energy. Jumper wires should be connected to the proper terminal and the battery to check if the relay made a clicking sound; continuity test should also be performed and the power circuit terminals are should also be tested. If any of these tests show failure the relay should be changed.