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88 wiring under dash security system confusion by Worcen
Started on: 09-16-2025 10:32 PM
Replies: 3 (43 views)
Last post by: Worcen on 09-17-2025 10:32 AM
Worcen
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Report this Post09-16-2025 10:32 PM Click Here to See the Profile for WorcenSend a Private Message to WorcenEdit/Delete MessageReply w/QuoteDirect Link to This Post
Hey guys, recently got an 88 fiero as a project. There was an old StealStopper model 70 anti-theft device wired under my dash. I think I've got 99% of it all out but I need to figure out a few wires that got messed up in the process. There's this one connector the comes down from the back of the dash with 2 black wires that I can't find where it goes. There's also the yellow wire coming from the connector that goes to the last piece from the security system. I circled the black/gray wires and yellow wire in green. There's another yellow wire that comes from behind the gauge cluster that I assume goes to the yellow wire coming from the back of the dash. I circled both of those in red. The blue circle is what I assume is the rest of the junk from the security system. My main question is do those yellow wires go together? And is that connector under the dash part of the security system? Or does it go somewhere. The black/gray wires go up into the back of the dash too. Thank you!

I also added the pic without my edits for clarity.

There's also a white wire the goes to a fuse? It goes up to the left of the steering wheel. Not sure if that's a security system artifact but I might need to take the dash apart to find out.

Any help is appreciated! Thanks!
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Report this Post09-17-2025 07:40 AM Click Here to See the Profile for Vintage-NutSend a Private Message to Vintage-NutEdit/Delete MessageReply w/QuoteDirect Link to This Post
My suggestion is purchasing a copy of the 1988 Pontiac Fiero Service Manual - It has all the schematics with the colors of the wires.

This information is also available on-line at:
https://fieroinfo.com/manua...o_Service_Manual.pdf

------------------
Original Owner of a Silver '88 GT
Under 'Production Refurbishment' @ 136k Miles

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olejoedad
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Report this Post09-17-2025 08:27 AM Click Here to See the Profile for olejoedadSend a Private Message to olejoedadEdit/Delete MessageReply w/QuoteDirect Link to This Post
The heavy gage yellow wires are your start signal from the ignition switch to the rest of the car. They should be connected to each other.
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Worcen
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Report this Post09-17-2025 10:32 AM Click Here to See the Profile for WorcenSend a Private Message to WorcenEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by olejoedad:

The heavy gage yellow wires are your start signal from the ignition switch to the rest of the car. They should be connected to each other.


I had a feeling those were important! Thanks! I'll connect those two back up.
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