91 cutlass supreme what are these wires

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Forum Name: Vehicle Wiring Information & File Requests
Forum Discription: Request Car Alarm, Car Stereo, Cruise Control, Remote Starter, Navigation, Mobile Video, and Other Vehicle Specific Wiring Info, Manuals, Tech Tips
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=118103
Printed Date: May 13, 2025 at 6:50 PM

Topic: 91 cutlass supreme what are these wires

Posted By: gadjette
Subject: 91 cutlass supreme what are these wires
Date Posted: November 29, 2009 at 6:17 PM

posted_image

My mom's car is a 91 Olds Cutlass Supreme, she's had some repetitive charging problems. She recently had an ignition module replaced.

Her car stereo now has so much static it's unusable. I changed her battery today, and in the process found these two loose wires. They are next to the sidewall by the battery. The red (right) wire appears to come from beneath the fuel relay (the big black box in the foreground) and the second terminal on the left has a black wire and a tan or beige running to it, and disappears into a branch of the wiring harness directly below.

I'm 800 miles from home, if someone has an expanded wireing diagram and wouldn't mind looking them up for me, I'd appreciate it greatly. If it's something I can take care of quickly while I'm here, I'd like to do so. If they are pretty much no biggie, that'd be cool to know too.

The car keeps popping the SES light, but she's had trouble getting the local mechanics she's used to find the issue. Just want to make sure these aren't part of the main problem.

Thanks for your time, guys!

Replies:

Posted By: sparkie
Date Posted: November 29, 2009 at 8:20 PM

It is difficult to see the picture clearly. The plugs may not be required at all. Have a good look at them to see if there is any corrosion on the contacts. This would suggest that they have never been plugged into anything. Those cars usualyy had extra plugs under the hood for other options which your car doesn't have. Find a mechanic that has a scan tool and that will tell you what the engine code is that is turning on the SES light.

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sparky

Posted By: gadjette
Date Posted: November 29, 2009 at 8:36 PM

They're clean, that's why I thought they may have been connected to something. And sorry about the image - flashlight + PDA camera didn't make for a clear picture.

Thanks for taking time to respond.

Posted By: chriswallace187
Date Posted: November 30, 2009 at 12:34 AM

Since that car is OBD-I, you can easily read the trouble code yourself without a scanner. Here's a pretty good illustration of the procedure.

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C Renner's Auto Electronix
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