2008 6.2L gmc electrical issue please help
Had my vehicle at the mechanic and got it back with a
dead battery, or so I thought. As soon as you hook it up to
jumper cables you have about 4 sec to start it and if you
do it in that time it starts right up but after 4 sec
everything just goes dead and I mean everything and is
completely dead. The battery is brand new it’s got good
connections. If you detach the cables and hook them
back up it’s like it resets something and gives you about 4
sec again to start it. And once you start it if you turn it off
it will not start again everything will be completely dead. I
checked all relays and fuses and I’m not sure what’s
wrong.