Back-up lights don't work - The 1947 - Present Chevrolet & GMC Truck Message Board Network

gmc396 · 07-26-2019, 04:26 PM

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!

franken · 07-26-2019, 07:16 PM

Trace through the wiring diagram...

https://www.google.com/search?q=colo...BJN2nDauILAkM:

gmc396 · 07-26-2019, 07:43 PM

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.

07-26-2019, 04:26 PM	#1
gmc396 Registered User Join Date: Aug 2013 Location: Ephraim, WI Posts: 45	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!

07-26-2019, 07:16 PM	#2
franken Registered User Join Date: Jun 2013 Location: Somewhere Posts: 3,069	Re: Back-up lights don't work Trace through the wiring diagram... https://www.google.com/search?q=colo...BJN2nDauILAkM:

07-26-2019, 07:43 PM	#3
gmc396 Registered User Join Date: Aug 2013 Location: Ephraim, WI Posts: 45	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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