Re: Backup Lights/Switch
what i would do is check out all your other lights. make sure that when you back up that there aren't any signal indicators or other lights turning on. the current may be directed a different route and it has to go somewhere so it's possible for it to travel to another light.
I would re check the bulb and the fuse again cuz it can't hurt. pull the bulb out and look at the filaments (metal terminal thingies) and make sure they're clean and not broken.
Vibration from a large sound system can be the cause of little wiring problems.
Look for corroded wires.
check every connection and ground.
and again test all the other electronics in your car to see if they're affected.
99 Cobra: flowmasters, 18x9.5 cobra R's, soon to be tuned and geared. daily driver
99 V6:in avatar, Mac Cai, true duals/flowmaster 40's ,UDP, custom tuned, bullitt suspension 18" wheels...taken by mother nature