ECM Power And Ground Circuits Wiring Diagram (1989 4.9L, 5.0L, 5.8L Ford F-Seris Pickup)

APPLIES TO: This simplified ECM power and Ground circuits wiring diagram applies to the following vehicles:

F150:

• 4.9L L6 Ford F150 Pickup: 1989.
• 5.0L V8 Ford F150 Pickup: 1989.
• 5.8L V8 Ford F150 Pickup: 1989.

F250:

• 4.9L L6 Ford F250 Pickup: 1989.
• 5.0L V8 Ford F250 Pickup: 1989.
• 5.8L V8 Ford F250 Pickup: 1989.

F350:

• 4.9L L6 Ford F350 Pickup: 1989.
• 5.8L V8 Ford F350 Pickup: 1989.

This wiring diagram includes the following circuits:

• EEC Power Relay.
• EEC Module Grounds.

EEC POWER RELAY TESTS: This relay is a common no-start culprit —here's how to test it step-by-step.

• Testing The Ford EEC Power Relay (Brown Relay).
• EEC Power Relay To PCM Circuit Tests (1985-1991 4.9L, 5.0L, 5.8L Ford F-Series Pickup).

WHERE TO BUY THE EEC POWER RELAY: If you're looking to replace the EEC Power Relay, these are two options I stand by —based on my hands-on experience with these known automotive brands in the shop.

• Standard Motor Products RY-71T PCM Relay (Amazon affiliate link)
• Standard Motor Products RY71 Relay (Amazon affiliate link)

Buying through these links helps fund more free tutorials and wiring diagrams —at no added cost to you. Thanks so much for your support!

EEC Power Relay Circuit Wiring Diagrams

• ECM Power And Ground Circuits Wiring Diagram (1985-1986 5.0L V8 Ford F-Series Pickup).
• ECM Power And Ground Circuits Wiring Diagram (1987 4.9L, 5.0L V8 Ford F-Series Pickup).
• ECM Power And Ground Circuits Wiring Diagram (1988 4.9L, 5.0L, 5.8L Ford F-Series Pickup).
• ECM Power And Ground Circuits Wiring Diagram (1990-1991 4.9L, 5.0L, 5.8L Ford F-Series Pickup).

More Ford F-Series Pickup Tutorials

You can find a complete list of Ford F-Series pickup wiring diagrams and tutorials in this index:

• Ford F-Series Pickup Index Of Articles.

Here's a sample of the tutorials you'll find in the index:

• How To Test The MAP Sensor (Ford F150, F250, F350).
• How To Test The Ford Fuel Pump Relay -No Start Troubleshooting (Green Relay).
• How To Test The Ford Ignition Control Module.
• How To Test The Ford Ignition Control Module (Distributor Mounted).