Ok I have a 1990 Chevrolet K1500. For some reason the radio flickers on and off. I hooked up a second ground wire thinkin the car was looking for a good ground. The radio works fine now but the fuel gauge wont move from half a tank. I dont know what else to do
i had a 1989 k 1500 with the same problem and found out that the baffel in the gas tank to keep fuel from moveing from side to side came lose and got stuck under sending unit. i replaced with a new tank and did it my self cost around 150.00 dollars. i later found out that chevy had a recall on those gas tanks due to baffel comeing lose and moveing around in tank. new tank fixed my problem. also might want to replace fuel pump at the same time i had to replace mine about 6 months after replaceing new tank.