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Power Window Harness - What's this?

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Old Feb 12, 2026 | 02:16 PM
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Default Power Window Harness - What's this?

Swapping out the power window harness on my '75 and can't figure out what this brown section of wiring is (see attached photo).

The wiring diagrams I have for the old harness and new harness have the pink/black connecting to BAT on the fuse black. The pink/black pigtail that comes off of that is empty in the diagrams but my old harness has this brown wire section. I've searched the forum but I haven't been able to find an answer.

Any ideas?

Thanks!!

Old harness removed. What is the brown wire going to/for?
Old harness removed. What is the brown wire going to/for?
Wiring diagram of my new harness. Nothing plugged into the pink/black pigtail.
Wiring diagram of my new harness. Nothing plugged into the pink/black pigtail.

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Old Feb 12, 2026 | 11:51 PM
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From this thread, it appears to be part of the headlamp "on" warning buzzer. Does your black box have similar numbers?



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Old Feb 13, 2026 | 10:22 AM
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Originally Posted by barkingrats
Does your black box have similar numbers?

Headlight warning buzzers
Headlight on warning buzzers

It sure does! Or ...um...used to. Thanks so much @barkingrats Did you remember that post or are you just really good at search terms?

I guess the "headlight on buzzer" plugs into the power window harness instead of the rear defogger switch on convertibles (which mine is). Makes sense. No defogger.



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Old Feb 13, 2026 | 10:43 AM
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Originally Posted by Stephs75
Headlight on warning buzzers

It sure does! Or ...um...used to. Thanks so much @barkingrats Did you remember that post or are you just really good at search terms?
I searched on what power accessories would use that short pigtail if the car has power windows. That the buzzer was a standard feature and not an option was just the luck of looking through several threads.
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