Join Date: Dec 1999
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Re: Can I Jump start my own Jeep?
when you parrallell 2 batteries does it equal the lowest voltage, or do they equalize somewhere in the middle?
My father (E.E.) has told me but ive slept since then.
basically the battery with the higher voltage flows into the battery with less voltage, so yes you would be better off unhooking the weak battery, and using the GOOD battery.
a cheap way would be one of those battery disconnect switches, when its dead, just jumper cable to the good battery (external battery) and turn the battery disconnect off ( disconnecting the weak internal battery)
after it starts you can turn teh internal batt back on and unhook jumper cables
but honestly after about 2 times, id just fix the charging system, or run teh GOOOD battery in the Jeep!