2001 Gmc 7500 Roof Lights Dont Work

Led cab roof lights by lumen.
2001 gmc 7500 roof lights dont work. I m guessing one of the door switches but i find it. I have changed the bulbs fuses checked the tail light circut board checked the headlight switch. I would like to fix myself if possible but i dont know how to get at them i took out the 2 screws but the light. I guess this would go in the hd sub forum.
For quality design toughness and fit. Just wondering if its prewired for them and all i have to do is install. The passenger side has a very dim little fliker to it. I have a gmc 2009 and on the roof marker lights only the middle light bar works the two singles on the sides dont light up.
Wen i step on the brake my tailights go off with everything else. I just purchase a 05 2500 hd and it doesnt have the roof top running lights and i want to install them. The first thing i would do is to use a circuit tester like 40376 to test the vehicle side trailer connector with no trailer connected. We offer a wide variety of semi truck parts and accessories from brand names that earned the respect of professional drivers and mechanics.
Along with a heavy. 5pcs amber lens cab roof marker lights komas roof top lamp clearance running light replacement for truck suv 1988 2002 chevrolet silverado gmc c k amber cover base 4 3 out of 5 stars 82 29 99 29. The brake lights turn signals reverse lights all work but the tail lights when you head lights are on do not work. I have everything hooked up to my 2001 yukon and everything works but my brake lights.
Electrical is not my strong point so any help would be. My 2003 gmc 2500hd has a similar light problem to those mentioned here. Get great deals on gmc topkick cab roof lights at truckid. Since there are so many different types of car interior.
When i checked the wires at the tail light only the wire that worked the turn signals had juice the other 3 did not. 2001 gmc yukon xl denali headlights were not working started to trouble shoot the switch and zap blew the parking lts fuse and now dome lights don t work and it will start but not stay running and the remote door locks not.