Indeed the problem could be the battery, but it could also be a parasitic drain on the battery being caused by an electrical short circuit somewhere. I would have the battery tested first. If it comes back as being bad, then, yes, replace it. If it comes back as a good battery, then you will need to run a test to find the short circuit. Here is our guide that allows anyone to do this:
https://www.2carpros.com/articles/car-battery-dead-overnight
And here are the instructions to a test that I use myself (after checking the various switches and lights). There is a test that anyone can do for an electrical short. All you need is a multi-meter ($15.00 to $20.00 or so at AutoZone). Disconnect one of the battery cables from the battery. Take your multi-meter, turn it on, and set to 20 volts DC. Take one lead and connect it to the newly disconnected battery cable, and connect the other lead to the battery post. You may have to MacGyver it to keep the leads connected. You should see some sort of reading. Now start unplugging fuses, one at a time, until you see a significant drop in the meters reading. You have now identified the circuit. If the car has any aftermarket electronics (like a radio, for example), then start with checking that. Let us know what you find and we will go from there.
Here is the multi-meter that I use:
https://www.amazon.com/Functions-Craftsman-Multimeter-Voltmeter-34-82141/dp/B01FM5QKHY/ref=sr_1_2_sspa?ie=UTF8&qid=1526038252&sr=8-2-spons&keywords=craftsman+multimeter&psc=1
Thanks for using 2carpros and please keep us posted.
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Friday, May 11th, 2018 AT 4:35 AM
