No power to none of the accessories
Things to check: battery and connections, there is also an accessory lead from the starter that goes to fuse box, check all fuses
No power to transmission
1990gmcserria no overdrive
Looking for a Used Sierra 1500 in your area?
CarGurus has 65,553 nationwide Sierra 1500 listings starting at $2,495.
Search GMC Sierra 1500 Questions
GMC Sierra 1500 Experts