Johnny89345
OBS Enthusiast
i have a 2000 cucv k3500 6.5 diesel with the 12v/24v system. It ran for the last few weeks fine until it completely drained the drivers side battery. Its been cranking slow but once it gets going all electronics work fine. How do i test the voltage solenoid on the firewall? And i replaced batteries so we can rule that out. The alt also charges just over 14v. With the truck running the passenger side battery will read what the slt is putting out while the drivers side battery sits around 12.5. Please help