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My battery is drained when left for a few days

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You either have a weak battery that will not hold a charge or you have a draw on your battery that is using power when the vehicle is off. The best way to look for a draw is to unhook the negative battery cable and put a test light in line, clip the end of the test light onto the battery post and the probe end onto the cable, if there is a draw the light will light, if it lights very dim then this is known as a parasitic draw, which is common for things like the computer and the clock, but if it lights bright then you have a problem and need to trace down the circuit with the problem. You can usually accomplish this by pulling fuses one at a time and watch for the light to dim. Start with the distribution center under the hood and move to the interior fuse panel. Also, I usually start be unhooking the main supply wire for the alternator as this can be a common source for a power draw, If you do not find a draw on the battery a hydrometer can tell you about the health of your battery and if it is in need of replacement.

Posted on Nov 13, 2014


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