2 new alternators Still not charging

[DENALI]

I have an 03 that isnt charging. I replaced the alternator with a new one twice today (napa) with the same result. I am positive its not the alternator although my local napa is a small one and doesnt have a way to test the alternator itself other than to swap it out with another.
I am hoping there is something thats common other than the alternator which you guys can direct me to Thanks

[bismic]

Sure the batteries are good?

[DENALI]

Originally Posted by bismic

Sure the batteries are good?

Yes i load tested them tonight.

[bismic]

How many amps does your tester draw? Many (most) home testers are not capable of fully testing the batteries (and they need to be tested individually as well). I have a tester too, but I realize that while it can be a positive indication of a bad battery, it is not necessarily a positive indication of a good one (hope that makes sense).

[snopro_03]

You need to test the electrolytes in your batteries with a refractometer. load testing a battery is only a partial test of a battery. ive seen this countless times while load testing a battery it shows up good but checking the battery fluids they show up bad.

[snopro_03]

And ive seen your exact symptoms with no charging issue. batterys load test good fluid tests bad install new batteries problems gone.

[WarChild]

Inspect all the cables. Make sure there aren't any brakes or corrosion buildup but I too am going with bad batteries.

[Brieldo]

Any codes being thrown?

[DENALI]

Originally Posted by Brieldo

Any codes being thrown?

Nope no codes. I am going to head into the next town over and get both alternators i have and both batteries tested. Will let you guys know when i know.

[Diezel Dawg]

I had the same issue with my alternator. Ended up being a bad battery warning light on the dash. Weird how a little light will keep your alternator from charging

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