ECM Power And Ground Circuits Wiring Diagram (1985-1986 5.0L V8 Ford F-Series Pickup)

  • By: Abraham Torres-Arredondo
  • Created: 09 July 2025
  • Updated: 10 July 2025
  • Articl Id: 714
ECM Power And Ground Circuits Wiring Diagram. EEC Power Relay Circuit Diagram. (1985 5.0L V8 F150 And F250 Pickup)

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.
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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.

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:

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

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:

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