Question about GMC Sierra 3500

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I have an 03 GMC 3500 dually that the driver's side fender running lights won't light up. The passenger side work fine. Also my reverse light doesn't light up either. Could that be the problem?

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Check battery voltage both sides of stop light switch if if none check fuse , if one side only replace switch, if ok check voltage at light bulb holder if ok check bulb or earth system

Posted on May 03, 2017

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I have an 03 GMC 3500 dually that the driver's side fender running lights won't light up. The passenger side work fine. Also my reverse light doesn't light up either.


Are the bulbs good ? Did you check for B+ voltage at the lamp sockets ? The passenger and the driver side get B+ voltage from the same place . Do you know how to do automotive electrical circuit testing with a DVOM - digital volt ohm meter ? Do you know what a wiring diagram is ? How to use it to find testing points in a electrical circuit ? Here is a web site for free wiring diagrams .
http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine size . Under system click on lighting , then under subsystem click on exterior lighting . Click the search button , then on the blue link's . The light's on the fenders are maker lamps ! Now here is were it gets tricky , if you look at the diagram on the right you will see the back up lamps are controlled by the BCM - body control module . The BCM gets a turn on signal from the PCM -engine computer , because the transmission range switch is a input to the PCM . This can be very confusing to someone you doesn't deal with this sort of thing . Hooking up a scan tool that can view this type data would be the easiest way to trouble shoot .

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