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72 courtesy lights and mystery wire

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Old 04-04-2017, 09:19 PM   #1
Joe79Vette
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Default 72 courtesy lights and mystery wire

I was looking into why my courtesy lights are not working. I found a broken bulb so that was easy I thought. I cleaned it up and I have the driver side working. Problem is now it is on all the time. So I did some tracking of wires. Under the console the cigarette light wire is plugged into the yellow wire labeled PKG SW conn on the wire diagram. I know the cigarette light wire is hot but what is the yellow wire for and could this be my issue?
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Old 04-04-2017, 11:36 PM   #2
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I guess the real question is what is the yellow wire for. My car is a radio delete and no AC.

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Old 04-05-2017, 12:02 AM   #3
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my68-82 shop manual has the 20 yellow ending at the radio plug with 14 black and 20 grey.

not much help I know.
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Old 04-05-2017, 12:17 AM   #4
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my68-82 shop manual has the 20 yellow ending at the radio plug with 14 black and 20 grey.

not much help I know.
I thought it was radio related but that is why I looked at my wiring diagram and found the the yellow PKG SW Conn wire.

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Old 04-05-2017, 12:27 AM   #5
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you had a good look at the door switch ? sometimes they go faulty !
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Old 04-05-2017, 12:56 AM   #6
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I am testing those tomorrow. That could be the issue as well.

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Old 04-05-2017, 12:02 PM   #7
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Are all of your courtesy lights staying on or just the drivers side? Hard to tell from your post.

My experience with the courtesy lights on my 70 has always been the original door switches. The part that moves is usually the part that fails.

If my courtesy lights stay on all of the time, I simply twist or jiggle the plunger on the drivers side door a bit, then test it buy pushing it in. A twist or two is usually all that is needed to reposition the wire that is grounded and keeping the lights on.

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Old 04-05-2017, 11:41 PM   #8
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Are all of your courtesy lights staying on or just the drivers side? Hard to tell from your post.

My experience with the courtesy lights on my 70 has always been the original door switches. The part that moves is usually the part that fails.

If my courtesy lights stay on all of the time, I simply twist or jiggle the plunger on the drivers side door a bit, then test it buy pushing it in. A twist or two is usually all that is needed to reposition the wire that is grounded and keeping the lights on.


Looks like it was the plunger. But I still can't find what the yellow wire is for. Even through it is on the diagram. I can't find anything about it.
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Old 04-06-2017, 09:23 AM   #9
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Is the yellow wire for the Parking Brake Handle Switch? When you use the parking brake does the BRAKE light turn on?

Last edited by Revi; 04-06-2017 at 09:24 AM.
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Old 04-06-2017, 09:27 AM   #10
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Is the yellow wire for the Parking Brake Handle Switch? When you use the parking brake does the BRAKE light turn on?
Yes. The parking brake light works. The wire is brown I believe for this.

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Old 04-06-2017, 03:25 PM   #11
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I think I figured the yellow wire out. It is for the seatbelt warning light. But my car is a very early one and my seatbelt light is a timer switch in the dash. They changed this for the Dec and later cars. My car is a Aug of 71 so I would not have the later switch in the seat.

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