What is the general information about relays and their testing on Ford Excursion?

Question

Accepted Answer

Fuel injection system, horns, starter and fog lamps in the vehicle employs relays to switch electrical signals to the respective units. Relays use a lowcurrent control circuit to control a high current power circuit and if a relay is bad then the associated component will not work as it is supposed to. Majority of the relays are placed at the engine compartment fuse/relay box while some specific relays are placed on top of the interior fuse box in the dash. The fuse block is located at the back of the bus but to get there, one has to remove the fuse panel cover which is underneath the steering column. If a faulty relay is thought to be present, it may be removed and examined by following a particular course of action or by taking the vehicle to a dealer service department or a repair shop; yards defective relays are rectified as a unit. More often than not, relay's terminals are labeled in numbers according to ISO standards whereby they communicate the circuits and functions of the particular relay. Among the mentioned terminals four of them are control terminals which are connected to the relay control circuit and interacts with the relay coil while the rest are power terminals. When energized, the coil produces a magnetic field and this closed the larger contacts of the power circuit hence supplying power to the circuit loads. Terminals 85 and 86 are usually for the control circuit, certain connections are needed if a diode or resistor is present. Terminal 30 provides connection to the battery voltage most often used on the circuit loads, while terminal 87 connects the ground side of the circuit. For testing relay continuity ohmmeter can be used for continuity check through relay control coil, and then check its appropriate resistance and continuity at the power circuit terminals. This terminal can be connected to Terminal 86 and the positive terminal of the battery; the other wire connecting Terminal 85 to ground to make the relay click. Continuity should then be checked between the power circuit terminals and also ensuring that it functions properly if any test does not work as required then the relay should be replaced.

Genuine Ford Excursion Relay

7 Relays found

Ford Excursion Relay

Ford Excursion Starter Motor Relay Assy

Ford Excursion Direction Indicator Relay

Ford Excursion Direction Indicator Relay

Ford Excursion Relay

Ford Excursion Relay

Ford Excursion Relay

Ford Excursion Relay

Ford Excursion Relay Parts Questions & Experts Answers

Related Ford Excursion Parts

Browse by Year