OK guys, here's the problem. First off I have a constant SECURITY light but It shows no codes. Second, I've got flickering lights. If I go around a left hand bumpy turn, all my dash lights and headlights will flash off with the bumps...very bad problem to me, I hate it. But a right hand turn NEVER does it. Strange but that's how it works. Got to be a ground strap somewhere right??
2002 2500HD
8.1L Auto

 

Check the ground location under the driver's door frame rail. Also, check your negative cable from your battery, could have a bad screw or a bad cable.

Oh, if it's any black wire on the chassis, wiggle it to see what happens when the engine is off, lights are on.

 

ground strap at back of the block drivers side to the body... seems to be the only main ground controlling body related electrical. let me know what you find

 

I'll check both today. Its the first day its not been snowing or raining till it floods. I'll let you know what I find