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Truck won't run w/o battery... Alternator or voltage regulator bad?
My battery won't charge. I'm heading to get it tested/replaced, but this is the second battery in 2 years that dies and won't recharge. I'm pretty sure it's my charging circuit, but don't know how to tell whether it's the alternator or the voltage regulator (or are they both in the same unit?).
When the battery is DEAD, I can use my jump pack to get the engine started. But if I take the jump pack off in the first minute or so, the engine stalls out. After a minute, it keeps running, but the volt meter I have in the power outlet is jumping from 13 to 14.5, and all the lights are flickering. Perhaps that's normal? Or should the alternator be sufficient to drive all the (mostly stock) electronics w/o a battery?
This is an '07 5.7l limited.
FWIW, I have a cheap Walmart Hammacher-Schlemmer charger with an electronic display. It refuses to charge the battery when it's in the 'dead' state (2 volts). I have to start the truck, let it run for about 10 min, then the battery will have about 10V. Then the charger will work, but eventually the charger blinks 'error/check battery'. Which is what is causing my doubts about the battery health.