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I don't think so, one bad was on high side, one was on low side.

The 4th battery in the group is fine, tests very good. one bad one was in the high side, one in the low side. they were fine for the first couple weeks.

The 2 that were DEAD show 13 volts, charge at 5 to 8 amps and with a load instantly go to 0 volts. ??? 3rd one shows 13 volts, with load goes to 8 volts and heads for 0 in a couple seconds.

4 NEW interstate batteries 4 weeks ago. Now 2 completely dead and not chargeable, 1 VERY low capacity and 1 good. Never had any luck with interstate 6TL. So problem solved.

Thanks but run ground wire where? And what is the polarity box? Under the air /hyd pump? How to bypass it? What is notable is the voltage drop on batteries when starter is engaged. 26 volts to 19 volts indicates a huge current draw so how can there be a problem with polarity box, if it was bad...

with fresh batteries the batt voltage drops to 19-20 volts from 26. maybe starter is drawing too much or is jammed?

OK thanks for the suggestions. Maybe I didn't have a battery problem, here is what happens. New batteries fully charged, sit for 2 days with relay off. Batt voltage is 24 volts. Turn on under dash switch and then dash power switch everything seems fine. Push start and clunk, nothing. If hold...

Since I want to remove the entire instrument panel, are the gauge plugs numbered? or only go to one gauge? I have the manual but have been unable to install it.

OK, I want to take the entire dash out anyway to clean and to remove brake treadle valve, not captive nuts! Need access to back side of front as it got hit and very bent up. This 18 ga steel is hard to work with! Thanks

Ron, Thanks, no I don't see how anything could have been on. Do the wires for 12 volt meter go directly somewhere I could access they without taking dash out? Tom

that's the thing, what draw? and why did new batteries go flat in a couple of days?

OK, with disconnect switch on batt drain is 40 ma, with switch off drain is 5 ma. batts should last a year at that draw! maybe just a troll under the truck?

yes, I know that.

In what way?

Right but a meter on the batteries shows correct charging voltage. I know that doesn't account for the drain, alt was cold. when I got the truck it had sat for 1 year and the batteries had frozen but 3 of them recovered. I replaced all 4 just because. At first 12 volt meter on dash worked correctly.

Now I know that sounds simple but, 2006 A1R 7000 miles total. 4 new batteries charged and installed. 24 v meter on dash shows 24, 12 v meter on dash shows right at the yellow/green and constantly moves up and down while meter on low set of batteries shows constant 14 volt. Meter on high set...