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74M35A2....Any ideas why my alternator gauge is no pegged in the red? Past the green. Do I have something wrong?

So it sounds like 569 need to be on the negative terminal for the main positive battery.

Found this thread. Sheds some light on the issue but does not explain the alternator issue. https://www.steelsoldiers.com/threads/m939-power-wires.131420/

OK. So tonight I removed and installed the new batteries. Everything went as planned but when I started the truck the alternator pegged in the red. Shut the truck off and cycled it again and the same thing. Everything went back where it came from with the exception of 2 batteries now and not...

Well they just wont stay charged anymore. They are dated 2012. Kicked ass till about 6 months ago. Charged em up one more time this Sat. Had the truck out for 5 hours. Monday.....no start. Out with the old...guess I will just convert from 4 down to 2 of these. From these

I also just ordered two Battery tenders from Costco. They have the best price by far. But not driving these trucks like I used to is eating up batteries.

So if one were to replace these 4 batteries....What would you recommend for brand and size? I am in VA, so weather really not an issue and truck is garaged. Not a huge fan of interstate. Neighbor says he runs the Costco batteries in a lot of his trucks and likes them. I would most likely...

Shim is alive again. Thanks for the help.

OK...now what 74M35A2 makes sense. Did not know the voltage will only go as far as the clamp. So I will hit each battery for a while tonight w/o unhooking the entire set up. And M35A2-AZ can bust my Brofl if it blows it up.

No electrician here...BUT...if they are 4 of them in series...If I connect the + to the + on one and the -- to the other terminal...it's attached to the + of the next battery.

So, bringing this thread to life...Truck has been sitting and last night...no start. Mine has the 4 huge assume 6 volt batteries under the seat. So I can charge 2 at a time in series with a 12V charger? Forgot to take a picture, but the 4 batteries are hooked up in series. So assume 6V each?