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Re: Battery dies while sitting idle
Well it could be possible that you have a cell that is going bad.. This would cause battery to fade with little draw from onboard accessories (ie: clock, etc...) Why not spend a couple dollars and install battery isolation switch you can flip when vehicle is expected to sit for a duration... I know this doesnt solve the drain problem you have but could be a solution for not having to jumpstart it when you need to ude it..Good Luck
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Dealer should have been able to figure this one out!
Best bet to trouble shoot is next time it is going to sit for a couple of days disconnect the battery. After the couple of days pass hook up the battery and if it's dead then the battery isn't holding a charge, if not then something in the vehicle is draining the battery.
If you live in a colder climate weak batteries tend to be more of a problem as temps get colder.
If the battery is more then 3 years old it is a prime suspect.
either have a battery drain or your battery or alternator is bad-you can check all these things out if you have a battery voltmeter. The battery should be at 12.5 volts after sitting overnight and it should be close to 15 volts when first started, gradually dropping down to about 14.2 volts at idle.
Disconnect battery from vehicle overnight to check for internal battery drain.......just take one of the cables off. If the battery is still up and starting the vehicle after being disconnected after a day or two......the drain IS in the vehicle and will have to be checked again. Do it yourself. Buy a cheap 12 volt test light. Place it between the cable you removed before. One end on the battery post and the other on the cable end. Now....with the key off...... If the light glows brightly....you have TOO MUCH drain. We want a dim glowing light. The dim light is just the memory circuits in the electronics and OK.
With the doors closed....take out one fuse at a time until the light glows dim.......the fuse that dims the light is the problem circuit. If no fuse dims the light...remove relays one at a time. Remember....some fuses and relays could be in the engine compartment and under the dash. If no relay dims the light disconnect ALL alternator wires. Remember....anything that uses power will make the light glow ....keep those doors closed (we do not want interior light drain affecting the test ) and if you have a under hood light check it first by removing the bulb. We do not want false readings.