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Old 07-26-2019, 04:26 PM   #1
gmc396
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Join Date: Aug 2013
Location: Ephraim, WI
Posts: 48
Back-up lights don't work

I have a '68 C2500 GMC with the granny 4-speed. I've replaced the BU light switch in the transmission, but I still have no power to BU light socket on back of truck. I've checked the wiring to the front of the truck, but then loose it as it goes into bundles. I would greatly appreciate any advice or suggestions of what to check. Thank you!
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Old 07-26-2019, 07:16 PM   #2
franken
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Join Date: Jun 2013
Location: Somewhere
Posts: 3,102
Re: Back-up lights don't work

Trace through the wiring diagram...

https://www.google.com/search?q=colo...BJN2nDauILAkM:
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Old 07-26-2019, 07:43 PM   #3
gmc396
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Join Date: Aug 2013
Location: Ephraim, WI
Posts: 48
Re: Back-up lights don't work

Thank you. I just rechecked the fuse and see it was blown. Must have happened during the install of the back-up light switch as that was the first thing I checked. They work now. I also learned the ignition must be on for the BU lights to work.
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