How to find out what is draining your battery?


Asked by Sep 07, 2014 at 11:18 PM about the 1993 Chevrolet Cavalier

Question type: Maintenance & Repair

I have a cavalier chevrolet 93' and have had trouble with the battery constantly being
drained when it is plugged in, is there a way i can find out what is draining it, maybe a step
to step procedure of what I need and how to do it. thanks

1 Answer


Start with a fully charged battery, make sure both battery terminals are shiny clean, connect the positive cable, put a test light between the battery terminal and the negative cable end, make sure your connection is good, if you have a draw the test light will light, assuming it lights up the very first thing to do is electrically disconnect the alternator, if the light goes out then your alternator has a bad diode inside the alternator and needs to be replaced, if you still have a light then you will have to start removing circuits until you find the one that is causing the draw, you can do this by removing the fuses one at a time making sure you note where each fuse goes as you remove them, when you come to the fuse that turns off the test light that is the circuit that is killing the battery, then you need to find out what components are on that and disconnect each one till the light turns off, reconnect the previously disconnected components just to make sure the light stays off. replace the bad part, re-install the fuses, reconnect the alternator and that should be it. Note: your vehicle may have a parasitic load, this may cause the test light to glow dimly and is a normal function. Some of the smart test light can sense that this is a parasitic load and will turn the lamp off after a few seconds after hook up then will function as a normal test light. Hope this helps.

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