2007 GMC Sierra won’t start

[Teddy1$]

Accedently discontented the fuse box and now my truck won’t turn on and it says service airbag everything works but won’t start not even the click sound from the relay change relay and nothing check fuses and they look okay giving up any ideas

 

[Knowles Richard]

Hi teddy, check your owners or haines manual on this, try disconnecting the negative battery clamp first on your truck battery,Make sure your battery is fully charged, then unplug the same fuse block harness plug that was accidently undone, and carefully check both ends for bent or dirty damaged blades or prongs,Also check your engine and chassis grounds for good clean contact to all points from and to,if you plugged in the harness while the battery was still connected there could have been a electrical surge or spike to cause the starter relay in the fuse box, or inline fuse link to go bad,And if you can check for trouble codes, just some thoughts hope it helps. Old school mechanic Richard.

 

[98trck]

on my '98 truck when I had to replace the starter relay the wrong relay was in the box
the relay schematics are on the side of the relay
compare the old and new relay to make sure you have the correct one...
PETE