C3 interior lights
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Joined: Oct 2010
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From: Lubbock TX
C3 interior lights
Monkeying with electrical is alive and well. Previous owner did something. No interior lights, no dome or underdash. Open either door or hit the headlight controller - Nada. Looked at service manual. Looks like when any of the three switches (doors or headlight) is activated, they just provide a connection to ground. Since none of these make any light turn on, I wonder if there is a break farther upstream. Diagram shows these three lights come to a common splice point, this splice point then branches out to the three switches. I do have 12V at the dome light bulb connector. ANyone have any experience in knowing where this splice point might be or how to backtrack the harnesses to find a break??
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Joined: Oct 2010
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From: Lubbock TX
Ok
Have thought about that, but ground where?? If I ground at the bulb, it should work. Guess I could back track and see what I can find in the dash. But i guess depending on what bulb comes on, it might tell me if I am in front of or behind the splice. The way I understand the diagram, the splice point is how any switch can get all bulbs to turn on. Since no bulb comes on from any switch, would that not indicate there is a break somewhere upstream mainly around the splice? If I had a bad switch or a wire break between the switch and the splice point, one of the other switches would turn on the bulbs. I am DOA on all bulbs. Will try that and if I can find several white wires, will try them all.
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Joined: May 2006
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From: Dayton, Ohio
If you just pull the bulb and socket down,you should be able to take grounded piece of wire and touch the end to the brass case of the bulb. If it has power that should ground and light the bulb and most likely all your bulbs will light.
What year are you working on ? When you said dome, I am thinking 77 and up , that brings into play the delayed system. Your door switches go there but the HL switch white wire does not.
Try the grounding,that will tell us if you have power and if they all work,then we can search for the interruption in the ground. Could be as simple as someone unplugged the delay relay.
What year are you working on ? When you said dome, I am thinking 77 and up , that brings into play the delayed system. Your door switches go there but the HL switch white wire does not.
Try the grounding,that will tell us if you have power and if they all work,then we can search for the interruption in the ground. Could be as simple as someone unplugged the delay relay.
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Joined: Oct 2010
Posts: 56
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From: Lubbock TX
If you just pull the bulb and socket down,you should be able to take grounded piece of wire and touch the end to the brass case of the bulb. If it has power that should ground and light the bulb and most likely all your bulbs will light.
What year are you working on ? When you said dome, I am thinking 77 and up , that brings into play the delayed system. Your door switches go there but the HL switch white wire does not.
Try the grounding,that will tell us if you have power and if they all work,then we can search for the interruption in the ground. Could be as simple as someone unplugged the delay relay.
What year are you working on ? When you said dome, I am thinking 77 and up , that brings into play the delayed system. Your door switches go there but the HL switch white wire does not.
Try the grounding,that will tell us if you have power and if they all work,then we can search for the interruption in the ground. Could be as simple as someone unplugged the delay relay.
Safety Car
Joined: Jun 2004
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From: Beecher Illinois
There is a way to bypass it.
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Joined: Oct 2010
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From: Lubbock TX
AH-HA!! I think I have seen that delay. I was in there working on AC and I wondered what that was. Will do, I will check it out.
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Thread Starter
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Joined: Oct 2010
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From: Lubbock TX
Good News!! Kind of emabrassed, I am glad you mentioned what the delay does when it fails, lights are ON. All the bulbs were burnt out. Why did I just assume they or at least one would be working. Well, put in a new bulb and it is ON, all thetime. Remembering what you said on the delay, I pulled it out. Shorted the whites together, and that is it!!! Thanks a bunch. Sure am glad u mentioned the delay.
