APPLIES TO: This simplified ECM power and Ground circuits wiring diagram applies to the following vehicles:
- 5.0L V8 Ford F150 Pickup (w/ EFI): 1985, 1986.
- 5.0L V8 Ford F250 Pickup (w/ EFI): 1985, 1986.
This wiring diagram includes the following circuits:
- EEC Power Relay.
- EEC Module Grounds.
EEC POWER RELAY TESTS: Step-by-step guide to testing Ford’s brown EEC Power Relay with a multimeter.
- 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: Whenever you're ready, here are two EEC Power Relays I personally recommend —brands I've used in the field and had great results with over the years:
- Standard Motor Products RY-71T PCM Relay (Amazon affiliate link)
- Standard Motor Products RY71 Relay (Amazon affiliate link)
Buying through these links helps support this site and keeps these free wiring diagrams and tutorials coming —at no extra cost to you. It's a small way to say thanks, and I truly appreciate it.
EEC Power Relay Circuit Wiring Diagrams
- 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 (1989 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:
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).
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