Review on 🔧 Dorman 901-130 4WD Switch for Cadillac, Chevrolet, and GMC Models by Dusty Oner

I have purchased this exact product from Revain several times to repair my 'SERVICE 4WD' bulb. New selectors solve the problem in just two days or in a whole year. Saw on GM message boards that the solder points in the selector need to be hardened if the part is expected to work properly. I re-soldered all five blocks I've collected over time and they all work perfectly now. Too bad it was necessary. Most normal people don't have time to play Inspector Gadget. But the process is easy and worth the effort.