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Old 09-18-2015, 03:55 PM   #1
Jcox68rt
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Power to brake light switch?

I was trying to diagnose a problem with my brake light switch in my 63 gmc swb fleet-side. There is a white wire and orange wire leaving the switch and goin up into the wiring harness. Simple enough, however, the orange only becomes hot when I turn my headlights on.. Seems like it should come on when the key is on or always hot. Right? I have two orange wires coming out of the other side of the harness and they both go to the same spot on the headlight switch. I'm pretty sure I can tell which one is the one that comes from the brake light switch because of the gauge. Should I remove it from the headlight switch and run it down to fuse panel in a non fused space that's available?

Am I over thinking this one?

Thanks in advance!
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Old 09-18-2015, 11:57 PM   #2
Jcox68rt
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Re: Power to brake light switch?

No wiring gurus chiming in? I can always grab a constant hot from anywhere I guess or a hot from my ignition switch?
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Old 09-19-2015, 12:37 AM   #3
66pnl
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Re: Power to brake light switch?

That orange wire should be hot at all times, it's the same circuit that powers the dome lamp. Comes from the fuse panel to the h/lamp switch then to the brake switch. Does the dome lite work.
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Old 09-19-2015, 06:39 AM   #4
The Rocknrod
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Re: Power to brake light switch?

I did a print screen since this pic is from a pdf. Hope this helps.
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Old 09-19-2015, 08:26 AM   #5
awbrown
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Re: Power to brake light switch?

The orange wire should be hot all the time , key on or not ... simply rewire it so it is hot and you should be fine .. if you have no brake lights after that repost .. if I remember , it comes off the headlight switch ,so the switch may be bad .. Mine was and I just picked a hot wire and spliced it in ...
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Old 09-19-2015, 10:19 AM   #6
Jcox68rt
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Re: Power to brake light switch?

Quote:
Originally Posted by 66pnl View Post
That orange wire should be hot at all times, it's the same circuit that powers the dome lamp. Comes from the fuse panel to the h/lamp switch then to the brake switch. Does the dome lite work.
The dome light is missing, however I just bought a new one from brothers.


Quote:
Originally Posted by The Rocknrod View Post
I did a print screen since this pic is from a pdf. Hope this helps.
The screenshot does help, it shows those two orange wires coming off a hot leg of the headlight switch.


Quote:
Originally Posted by awbrown View Post
The orange wire should be hot all the time , key on or not ... simply rewire it so it is hot and you should be fine .. if you have no brake lights after that repost .. if I remember , it comes off the headlight switch ,so the switch may be bad .. Mine was and I just picked a hot wire and spliced it in ...
I have a new headlight switch to install also, that leg on the headlight switch according to the schematic above looks like it is a constant hot? So my switch is probably bad. It was doing some wonky stuff when I first got the truck. I'll change it out and see if it helps. If not I'll just grab a constant hot from somewhere, probably the fuse panel since it's right there.

Thank you all for the insight, help, and the schematic!
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Old 09-19-2015, 12:31 PM   #7
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Re: Power to brake light switch?

Ya I'd run a quick jumper from a hot lead to see if it works.
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