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I have a 2003 GMC Envoy XL and the driver's side front parking and marker lights don't work although the signal light does. Both of the marker lights were blown and one of the prones in the parking lamp seemed to have been broken. I replaced the marker lamps and the driver's side parking lamps. The marker lamp on the passenger's side worked while neither the marker nor the parking lamps worked. I switched the two parking lamps and the passenger's side parking lamp still worked while the driver's side parking lamp and the marker still didn't work. I checked the front parking lamp fuse and the main fuse by replacing them with other fuses. I also cleaned the lamp connectors with electronic contact clearer. Also, I didn't find any burnt stains inside or outside of the connector. What can I do to fix the driver's side marker and parking lamps?

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Johnny Brown

GMC Master 5,763 Answers
Posted on Mar 14, 2011

Johnny Brown

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The first thing would be to test for power and ground at the wires going to the sockets, the most common reason for this is the sockets go bad inside.this is a complete unit, the main connector is where you would check for power first then go on to socket, most of the time the connector for the main power feed goes bad, it has a connector for all the wiring and then splits all wires to there location inside headlight asm. again testing with a testlight would be very helpful i think you will find a bad socket for each light out or the main connector on the headlight asm is bad. good luck. have a good day.

sasilvertree

Expert 55 Answers
Posted on Mar 14, 2011

sasilvertree

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If you have a test light, you can check for power at the light sockets and connectors. If you have power, you can connect the alligator clip on the test light to the positive side of the battery and test for a faulty ground...Good luck!

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2003 GMC envoy XL...tail lights work but brake lights will not work is it the brake light switch and how can I test it

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