Alternator Output Control Relay 89 and 90 the same?

[shorage]

Good evening y'all.

So i was curious if the Alternator Output Control Relay is the same for both the 89 and 90?
I attached snapshot of the 89 and 90 EVTM regarding this item but it is not clear if it the same part number.

I am rewiring my 89 with a 90 harness and i think i forgot to pull this item. Thoughts?

Thanks

Frank Costa
89 with a 90 nervous system

 

[BaySHO Performance]

Pic 1 is for a 2.5l engine, not a SHO. The component diagram is for a SHO which shows an alternator output control relay, but it actually doesn't exist.

 

[NoSlo]

Are you having problems with your heated windshield, that you suspect the control relay?

Oh, wait - SHOs didn't come with heated windshields...

 

[shorage]

Well, that explains it. LOL. Thanks

 

[shorage]

No, im swapping a 90 harness into my frankenstien 89 SHO. The dash is a 90 and a long time ago in a state far far away i created an adapter using donor harneses to adapt the 90 dash harness to a 89 engine bay harness. i couldn't get the gauges to work. I figured its faster to just swap the harness. But i could be wrong. LOL

 

[luigisho]

Well keep us updated on that. Sounds like not fun! but maybe useful considering wiring issues at this age

 

[shorage]

So far so good, created new post with updates.
https://shoforum.com/index.php?threads/90-engine-harness-to-89-engine-connectors.139898/

Please reply on there if you can, Not sure if i linked it correctly.

The following is from that post
----------------------

Need 2 connectors to make an adapter. I am wiring a 90 "engine harness" to the 89 engine connectors. I need to create an adapter. Which is preferred to splicing into my "new" harness. Anybody have these? I would call them female connectors. I found the black one but i am not paying 80 bucks for it.

Apparently, they swapped from Male to Female on the "On Engine Harness" from 1989 to 1990

Just for clarification. I see 4 harnesses.

1) Dash Harness (out of firwall)
2) Light Harness/ABS/Airbag Harness
3) Engine Harness (Around engine and connects CCRM
4) On Engine Harness (sticks out the bottom of the throttle body into the valley)

I am sure i am naming them wrong, if anyone know the names, i will refer them to the proper names.


https://connectorexperts.com/i-24488497-ce8015f.html…

 

[shorage]

Well, its running, at first i thought my adapter was poo poo but i swapped the 91 MTX - L0S pcm in place of the 89 B9B i had in it and it fired right up.