GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hi, My name is ***** ***** for the delay.I will do my best to assist you.
from the way you explain the problem.
this sounds as if you may have a common bad ignition switch.
not the lock cylinder but the electrical switch itself
stand by,someone will be right with you.
If you take a test light to the fuse block, with the engine running, and touch the tops of each fuse to check for the presence of power, do you have any fuses that do NOT have power on them?
4 cylinder or 6 cylinder Sonoma?
Playing from memory here, there is a cluster of fusible links at the junction block under the hood on the driver's side fender. From looking at the schematic, it would seem that you probably have an open fusible link there. Locate these, and give each one a good tug. If one of them pulls apart, then it was burned inside the insulation, and needs to be replaced.