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Trust My Mechanic

Your Free Car Repair Advice and Auto Repair Help

Car Battery Drains Overnight

Austin Davis, November 5, 2006September 27, 2014

This morning my Corvette was completely dead. The battery is new, replaced mid September. Nothing on the car works, and there is no clicking when I tried to start the car. What could this be.

Lori
California

Hello Lori

Thanks for your email. You really need to have a complete charging system test done to determine what is happening. This test should include the following tests:

1. Load test the battery to check to see if the battery has an internal problem

2. Check the alternator output does the alternator recharge the battery properly

3. Check for a voltage drain is there something left on that is draining the battery overnight like a trunk, glove box or hood light

4. Check and clean the battery cables if the cables are loose or dirty the power from the alternator can t reach the battery

I would bet you either have a Drain something is sucking battery power with the key off. Or you have a bad battery or bad alternator that did not charge the battery the last time you drove the car.

There are a TON of electrical components on that car, so any electrical item that is left on or stuck on, will drain down a new battery over night. I have seen an electric seat motor and an electric antenna motor short circuit and drain a battery down overnight.

Most auto repair shops can do this test for you while you wait, and the cost is probably less than $50. You WANT to test all these components ON the vehicle, so don t take your battery out of the car for testing, take the whole car in for testing. Since this is a Vette .make sure the mechanic is knowledgeable about the charging system of this vehicle.

Blessings,
Austin Davis

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