1990 4.0 swap help


Deamers87ford

Deamers87ford

15+ Year Member

Joined
Jun 10, 2008
Messages
721
Points
3,101
City
Lancaster, Pa
Vehicle Year
1992
Transmission
Manual
i been working on wirering and when i hook battery up my instrument panel like shorts out and clicks and light for check engine comes on and stays on without keys it and if i put keys in the igntion i cant turn them whats going on how do i fix it?
 
Deamers87ford said:
i been working on wirering and when i hook battery up my instrument panel like shorts out and clicks and light for check engine comes on and stays on without keys it and if i put keys in the igntion i cant turn them whats going on how do i fix it?
Click to expand...

What year is the truck?
What year is the 4.0?
What motor came in the truck?
what wiring harness are you using? list all harnesses
any other info you think is important let us know?
I think I know what your issue is but Answer the above questions and I'll let you know if it is what I think it is
 
truck is a 90 4.0 is a 90 truck was originally a 2.9 im using the 4.0 engine bay harness an computer
 
Deamers87ford said:
truck is a 90 4.0 is a 90 truck was originally a 2.9 im using the 4.0 engine bay harness an computer
Click to expand...

Try unplugging the door light switch wiring on both doors and see what it does
Mine did the same thing but my truck was a 1990 and the wiring and motor was a 92... you may have a late 90 and the wires may be different... if so you will need the correct harness for the doors.. and be prepared to pull the dash.
 
hey i was looking at my wirering and i missed 2 plugs coming from the inner fender to about where headlights are on both sides what plugs into these?
 
Deamers87ford said:
hey i was looking at my wirering and i missed 2 plugs coming from the inner fender to about where headlights are on both sides what plugs into these?
Click to expand...

If you can take a pic of them and post it.. I can tell you what it goes to if I see it... come to think of it I bet you are talking about the speaker wires.. they are two wires and the connector is round... the door speaker wires run from the front by the headlighs down the inner fender (behind the fender) and into the door... It's stupid how Ford did it I know...
 
Last edited:
Deamers87ford said:
alright thanks ill do that tomrrow
Click to expand...

Make sure you do both sides.. I hope it helps.. Mine did the exact same thing.

But I changed all the under hood and dash wiring in mine so if you use the same dash I'm not sure...
 
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