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Thread: Volt meter wrong and batteries die

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    4 Star General Steel Soldiers Vendor m-35tom's Avatar
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    Default Volt meter wrong and batteries die

    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 shows constant 14 volt. This is at idle and alt lights show green.
    Further it sat for 2 days and batteries went down to 11 volts on all and would not even try to crank.
    Any ideas except that the 12 v meter must be bad?
    Thanks, Tom
    tom bauer m-621
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    4 Star General Steel Soldiers Vendor Suprman's Avatar
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    I would check the load battery box behind the cab.

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    Well a bad 12V meter shouldn't have drained the batts. Meter performance could be a case of garbage in-garbage out. Have you connected a multimeter at the panel meter? It sounds as if y0u have a wiring issue somewhere or a failed component such as a polarity box or even an alternator, causing a discharge.

    With everything turned off(like when the batts discharged) and with a fully charged set, you could put a current meter in line/series at the batteries to measure the drain, then start disconnecting circuitry downstream until you remove/find the source of the drain.

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    4 Star General Steel Soldiers Vendor m-35tom's Avatar
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    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.
    tom bauer m-621
    air conditioned - 28 air
    6 wheel drive - 3 air lockers
    power steering - hydraulic - over 250 kits sold
    fast - now 1 of 43 with .69 od !!!
    m-35 transmission expert
    avatar - 64mph @ 2400 rpm with 14.5R20XL

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    4 Star General Steel Soldiers Vendor m-35tom's Avatar
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    Quote Originally Posted by Suprman View Post
    I would check the load battery box behind the cab.
    In what way?
    tom bauer m-621
    air conditioned - 28 air
    6 wheel drive - 3 air lockers
    power steering - hydraulic - over 250 kits sold
    fast - now 1 of 43 with .69 od !!!
    m-35 transmission expert
    avatar - 64mph @ 2400 rpm with 14.5R20XL

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    Quote Originally Posted by m-35tom View Post
    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.
    Yea, I got that the alt was charging ok at the batts, measuring good voltage there and bad at the panel meter = bad meter or bad wiring. What I was getting at was depending on how yours is wired, the alt could be responsible for the drain.

    does yours have a manual disconnect switch and was it turned off when the batts discharged? If it was left on, there is a 24V sense line from the manual sw outlet to the polarity protection box. On the A1 schematic I have it looks like they put some load and voltage sensing into that device to monitor current flow, alternator load and it can output to control the disconnect relays to unload the alternator and batts during an overload. Not sure if they did this same functionality in the A1R, but if they did, A problem there could be causing the discharge with the manual disconnect left on.

    a connection problem in the polarity protection box could also cause your volt gauge readings...

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    4 Star General Steel Soldiers Vendor Suprman's Avatar
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    Under the box to the right of the batt box, where the disconnect relay is, should be a manual disconnect switch. Reach under the box it turns.

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    I'm the dude, man! Steel Soldiers Vendor simp5782's Avatar
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    What mine says. Probably a clue that there is a drain
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    1979 AM General M920
    1984 AM General M915A1 (Big Cam III, HT3B Turbo, Brushless 24v Alternator with equalizer, A/C, Rear 20,000lb winch. 11R24 rear tires and 395s up front.)
    1984 AM General XM923A4 ( Big Cam III NTC-400, HT4B turbo, Intercooled, #10 button, Dual fuel Line setup - MRAP Aluminum Radiator - 7" Ram Air Intake system - Dual 115 gallon tanks - Air Conditioning - 145amp alternator - Puradyn Oil Bypass system, CAT 7155 16speed transmission, riding on 16.00 AT-3s on HEMTT wheels. )
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    4 Star General Steel Soldiers Vendor m-35tom's Avatar
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    Quote Originally Posted by Suprman View Post
    Under the box to the right of the batt box, where the disconnect relay is, should be a manual disconnect switch. Reach under the box it turns.
    yes, I know that.
    tom bauer m-621
    air conditioned - 28 air
    6 wheel drive - 3 air lockers
    power steering - hydraulic - over 250 kits sold
    fast - now 1 of 43 with .69 od !!!
    m-35 transmission expert
    avatar - 64mph @ 2400 rpm with 14.5R20XL

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    4 Star General Steel Soldiers Vendor m-35tom's Avatar
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    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?
    tom bauer m-621
    air conditioned - 28 air
    6 wheel drive - 3 air lockers
    power steering - hydraulic - over 250 kits sold
    fast - now 1 of 43 with .69 od !!!
    m-35 transmission expert
    avatar - 64mph @ 2400 rpm with 14.5R20XL

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    coachgeo (09-13-2019)

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