I have an '07 LBZ dually. Issue is that it will only start with a jumper pack. I replaced one battery 6 mos ago and replaced the other today. The battery (or possibly batteries) would not hold a charge - I would need to jump them if the track sat for 20mins or more, even after a 1 hour drive. Voltage gauge is reading 14.4 or so with the engine rulling, so it seems like the alternator is fine.
When I turn the key to the "start" position, there is a click (or sometimes no click) and everything dies - the dash, all lights etc AND the power windows will not work. These are aftermarket and directly powered from the red junction box.
If I take the key out and put it in --- still nothing - all dead.
If I hook up the jumper pack, everything is back to normal and I can start it.
It is almost like some huge relay or switch is getting stuck and the jumper pack fixes everything, which I know is not the case from looking at the schematics
I realize the standard procedure is replace both batteries at once before doing anything else - but I'm stumped as it seems like something else (other than plain low cranking amps) might be causing an issue.
When I turn the key to the "start" position, there is a click (or sometimes no click) and everything dies - the dash, all lights etc AND the power windows will not work. These are aftermarket and directly powered from the red junction box.
If I take the key out and put it in --- still nothing - all dead.
If I hook up the jumper pack, everything is back to normal and I can start it.
It is almost like some huge relay or switch is getting stuck and the jumper pack fixes everything, which I know is not the case from looking at the schematics
I realize the standard procedure is replace both batteries at once before doing anything else - but I'm stumped as it seems like something else (other than plain low cranking amps) might be causing an issue.
