I was installing a viper alarm. Something I did or connected caused a big problem. When I turn on the parking lights, truck dies if running. My fuel gauge, dome light, rear sensors, and audio sound are not working too. What can it be? No one seems to have answers. All fuses and relay seems to be working.

 

Disconnect everýþhing and see if it makes a difference

 

I did take everything back out, problem remains there.