Car Fix DIY Videos

If you have a dead battery on your old car after you let it sit overnight with the battery cables hooked up, you obviously have a draw in the electrical system that is draining the battery. Here’s how to find it.

1. Get a multimeter that measures Amps, specifically milliamps.

2. Unhook the negative battery cable.

3. Set the multimeter to 200m in the Amp section

4. Attach the red wire from the multimeter to the negative battery cable.

5. Attach the black wire from the multimeter to the negative battery post.

6. If the numbers jump up, you have a draw in the system.

7. Go to the fuse block inside the car and remove each fuse or accessory wire one at a time. If the amp reading changes when you remove a particular fuse or wire, that is the item that is drawing.

8. Trace the wires in the circuit that’s causing the draw. You will likely find the issue but sometimes it can be an internal short.

9. If all fuses and accessory wires check out ok, move to the alternator. Unplug it and see if the amps changes. If not, check the voltage regulator (older vehicles).

10. After finding the issue, reconnect your battery and test it 6 to 8 hours later to see if voltage has dropped. It should read around 12.6 volts with the key and accessories off. Should be around 14 volts while running.

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