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Old 09-01-2024, 04:36 AM
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Default Alternator?
Quote:
Originally Posted by RCM1210 View Post
I'm in need of advice and/or a dependable auto mechanic for a 2015 Benz with 81000 miles that we've owned for 7+ years . My expensive 3 1/2 year old Duracell AGM battery goes dead about a day and a half after charging and starting a few times in the garage. I'm not sure if there is an electrical drain or bad battery. I was able to check all the fuses, except for 4-5 (under the hood) with a multimeter, which I couldn't reach the first try.

I've always worked on my own vehicles, but I'm no electronic/electrical guy. I only found out yesterday how to use my multimeter just enough... to check the fuses, lol. Have you ever heard the saying, " I drive it till the wheels fall off"? Well that's me!

Any suggestions would be very much appreciated.

And thanking you in advance.
I didn't see anyone mention the alternator as a possible failure point. Connect your voltmeter to the battery with the engine running. You should see 14+ volts. Less than that and you have a bad alternator.