How do i tell if ignition switch is the cause?
Turn the key and starter does nothing but if i jump the starter solenoid with a screwdriver
it will start and stay running. Checked relays and fuses. Everything in the truck works
when the key is turned on just wont run the starter
You have to some probing, check al the wires for corrosion, maybe it's the starter solenoid?
Search GMC Sierra 1500 Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
GMC Sierra 1500 Experts