ever since I installed aftermarket gauges my truck has been having problems, its been running about 11 volts, a week ago while i was driving my radio, and gauges went out, then everything else went out. i replaced the battery and alternator. still is doing the same problem, I dont know what else it is. it doesnt even start now.

 

What gauges did you install and where did you tap to get power? Sounds like you blew your radio fuse and a couple other fuses. If you disocnnect the gauges does it go back to normal (after replacing the fuses)??

Running 11 volts?? If the alternator is only putting out 11 volts you got a bad alternator. If the alternator is only putting out 11 volts thats not enough to charge the battery so the car wont start.