serious harness problem

[cruzinbill]

ok let me make sure im right on this until 89 the harness plugs are yellow 89 up had grey plugs for the ecu correct

 

[billspreston01]

86.5-89.5 are yellow, 89.5-92 are grey

 

[shaeff]

86.5-89.5 are yellow, 89.5-92 are grey

correct, sir. and to add to it:

in '89.5+ cars, the HAC sensor is built in the ECU, whereas on 87-88 turbo cars, the HAC is external, and mounts under the glove box area.

the harness to bod plugs are completely different (hence, why they are not interchangable between yearspans)

and a few other misc. plugs are different on the engine side. (about 4 1-wire connectors)

-shaeff

 

[cruzinbill]

ok thanks guys

 

[dirtlord420]

i put my 89.5 n/a harness in my 87 n/a and it works fine. but i guess that would be for turbos?

 

[Squid699]

86.5-89.5 are yellow, 89.5-92 are grey

WRONG........i have an early 89.......all 89's have the grey plugs and 89+ ECU and sensors. The difference lies with the interface with the body harness in the engine bay, which resembles an 88 harness more than the 89+. This would enable you to put an early 89 engine harness into an 86.5-88 if you had the right ecu and sensors.

For clarity:
86.5-88 yellow plugs
early 89 grey plugs (internal HAC 89+ ECU) and 89+ sensors, but 88 style body harness
late 89+ grey plugs, new sensors and newer style body harness. Will not fit on anything prior to mid 89

 

[dirtlord420]

ok makes sence now. thanks i was wondering how it was working.