Head lights, brake lights, interior dome light and dash lights do not work

Tiny
ZEE THAGREAT
  • MEMBER
  • 1980 PONTIAC FIREBIRD
  • 6.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 100 MILES
I have the car listed above the Head lights, brake lights, interior dome light and dash lights stopped working, but the blinkers work and the hazards work. I checked all the fuses and they are good. I changed out the headlight switch and that didn't work. I'm stumped I don't know what to do.
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Thursday, July 16th, 2020 AT 10:25 AM

8 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

First, great old car. Wish I had one. LOL

Okay, because of the model year, I have basically no wiring schematics to review. So, we need to work though this one step at a time. Hope that's okay.

First, did all the lights fail at the same time? Also, you mentioned that you checked fuses. In addition to checking the fuses, did you check if there was power to the fuses? Last, did you confirm if there is power to the switch. That is the one thing that ties everything you mentioned together.

Here is a link explaining the fuse checking process. Often times, people see a good fuse and assume everything is okay. However, if there is no power to the fuse, it doesn't matter if it is good or not.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Let me know. And please bear with me simply because I have no schematics to work through.

Take care,
Joe
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Thursday, July 16th, 2020 AT 1:46 PM
Tiny
ZEE THAGREAT
  • MEMBER
Yes, all the lights failed at the same time. I have not checked if there is power to them yet but I plan to. I'll double check the fuses again as well. Thank you so much for the quick response this has been a headache for me and I need some guidance in working this out. So if there is no power to the fuses or switch where should I look next?
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Thursday, July 16th, 2020 AT 9:00 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

If there is no power at the fuse, I will need you to confirm that the pins which the fuse connect to are not corroded or pushed down into the fuse box and preventing them to make contact. If that isn't an issue, I will need you to disconnect the battery and remove and inspect the rear of the box to make sure there is no damage. However, before you remove it, I want you to check something else, and that is ground.

Simply remove one of the lights and see if there is continuity to ground. Not always, but in many cases, the ground wire will be black or black with a white tracer on it. Basically, we will be confirming that ground to the lights hasn't been lost.

The good thing is because of the model year, it shouldn't be too complex. If the box is bad, it will need replaced.

If you have questions or need help about what I suggested, let me know.

Take good care of yourself.

Joe
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Thursday, July 16th, 2020 AT 9:11 PM
Tiny
ZEE THAGREAT
  • MEMBER
You have given me some really good direction and I appreciate you for it. I plan to set some time aside this weekend and start on this, I will be in contact about my findings and for any further direction. You take care as well and thank you much!
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Friday, July 17th, 2020 AT 12:34 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
You are very welcome. Let me know what you find. Another tech has uploaded schematics for this vehicle. They are very difficult to follow, but if the things above don't help, I'll start reading through them.

Take care,
Joe
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Friday, July 17th, 2020 AT 2:37 PM
Tiny
ZEE THAGREAT
  • MEMBER
I got a chance to check the ground to the headlight and it was good. So I got the fuse box and and the bulk head connection at the fire unbolted and I didn't notice anything funk on back of the fuse box, but I noticed on both sides of the bulk connection this black stuff all over the connections. Could this be the issue? I attached pictures.
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Friday, July 17th, 2020 AT 7:08 PM
Tiny
ZEE THAGREAT
  • MEMBER
Here is a shot of the other side:
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Friday, July 17th, 2020 AT 7:09 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Wow, that looks rough. To answer your question, anything that could prevent a clean connection can cause a problem. It could have something to do with it. Check everything up and see if it makes a difference.

Let me know.

Joe
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Friday, July 17th, 2020 AT 7:38 PM

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