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#1 |
Registered User
Join Date: Nov 2010
Location: WINSTON SALEM, NC
Posts: 106
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Driver's side reverse light not working
1972 GMC CUSTOM 1500
Replaced neutral safety switch All of my lights work except for the driver's side reverse light Checked bulb and it's fine Took bulb housing out and looks like only one wire going to socket How/what do I do next please Thank you, Keith |
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#2 |
Active Member
![]() Join Date: Apr 2021
Location: Santa Cruz, NM
Posts: 101
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Re: Driver's side reverse light not working
The metal lamp housing has to make ground contact. Clean the metal surfaces that make contact between the body and the housing.
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#3 |
Senior Member
![]() Join Date: Feb 2022
Location: Ca
Posts: 511
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Re: Driver's side reverse light not working
Use a multimeter and verify you have 12v at the socket. If you have power it's a simple ground issue at the socket or light housing. If no power, start tracing back. If the other side is lit, then you will not have far to trace. Both left and right use a common +12v wire from the switch. If other side is lit, the problem is between the intersection of the hot wire and the failed lamp. If you do not have a multimeter, spend 10 bucks at harbor freight. It will be one if the most useful 10 dollar tools you'll own.
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#4 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,549
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Re: Driver's side reverse light not working
just because the bulb looks good doesn't mean it is. I've been fooled more than once
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#5 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,156
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Re: Driver's side reverse light not working
I'll second this one!
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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#6 | |
Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,708
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Re: Driver's side reverse light not working
Quote:
The backup light circuit is a one wire circuit.. The socket, housing, and bed all work together to form the ground path.. Unlike the brake light circuit, if one backup light works, all switches and the fuse that are in the circuit are operational.. If you have voltage at the non-working backup bulb socket, then you have a ground path problem. If you don't have voltage, there is a break between that socket and where the wire divides for each light. |
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#7 | |
Registered User
Join Date: Nov 2010
Location: WINSTON SALEM, NC
Posts: 106
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Re: Driver's side reverse light not working
Quote:
No voltage at the non-working socket. Checked bulb with my digital multimeter. Last edited by slowboy; Today at 09:06 AM. |
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#8 | |
Registered User
Join Date: Nov 2010
Location: WINSTON SALEM, NC
Posts: 106
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Re: Driver's side reverse light not working
Quote:
I checked with meter, no voltage at socket. |
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#9 |
Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,708
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Re: Driver's side reverse light not working
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#10 |
Senior Member
![]() Join Date: Feb 2022
Location: Ca
Posts: 511
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Re: Driver's side reverse light not working
Remember, it's a one wire socket so you need ground. I would attach one lead of meter to good ground, then check the +12v pin in socket. If the socket and or housing is free from truck no risk of shorting. If housing still attached to truck careful with your probe. To verify housing is properly grounded, check ohms from socket lip to a good ground point. You should not see more than 1 to 3 ohms depending on how clean the contact surfaces are and distance between each point. Since the other side works the problem is going to be close and easy to find.
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