Cadillac Repair: DEAD BATTERY, cadillac cts, test light

Question
My battery seem to go dead after it sits overnight. I have to recharge the battery every morning> I have already replaced the battery. What could be draining the battery. I runs fine during the day I can come and go, but when it sit over night the battery goes dead. I drive a 2003 Cadillac CTS.

Answer
Hello,

It sounds like you have a parasitic draw. Could be a dome light, cigarette lighter problem, shorted circuit.

You need to find out what circuit the draw is on. You can disconnect the positive battery cable and put a test light in between. Start pulling fuses one by one until the test light goes out. That will be your trouble circuit and you will need to get an electrical service manual for your car, possibly on Ebay or Craig's list to determine what all is on that circuit until you find the problem.

Rob