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4.0l Swap Wiring help needed


Ottoparts

Member
Joined
May 4, 2021
Messages
10
City
Tijeras, NM
Vehicle Year
1988
Engine
4.0 V6
Transmission
Manual
Total Lift
I need to figure that one out!
I've looked at and printed off some of the wiring schematics but haven't found one using a 94 Explorer.

Here's my stuff: 88 B2 with 94 Explorer donor.
I'm in the midst of my 4.0 conversion. I have most of the wires hooked up, however I don't believe I have "switched" power to the EEC.
My CEL doesn't light up, I have no spark, and no fuel pump.
What switched wire should be activating the EEC relay?
 
You did a complete harness swap? Or just the 94 engine harness but keeping the 88 body harness?

According to the attached 94 4.0 engine diagram, there was a yellow wire that came from the underhood fuse box that feeds the ECM relay power. There is a red/lightgreen that comes from the ignition switch, goes to a diode, then changes to a tan/black that turns the ECM relay on when the keyswitch is turned.

Then the ECM relay feeds the fuel pump relay.
 

Attachments

I apologize as I should have mentioned that I kept the 88 dash and am just using the 94 4.0l engine harness.
Thank you for the diagram.
I'm not far off. I have the yellow wire (don't mind the cheap and temporary wire connector) hooked to the B2 black/orange wire. The yellow wire does indeed go to a diode, then changes to a tan/black.
The red/green I would tap the positive side of the battery and I would hear the relays click.
Now I need to find the B2's ignition wire.
Thank you for your help
 

Attachments

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You can take it off the old coil wire.
 
I believe the coil wire on the BII was fed with a white/blue wire.
 
The rf filter will have red light green.
 
Thanks folks.
I'll start with those.
 

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