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Thread: HMMWV electrical problem please help. Headlights out no volt meter and no wait light

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    Colonel MarkM's Avatar
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    Default HMMWV electrical problem please help. Headlights out no volt meter and no wait light

    My PBC box went out and replaced it with another but no wait light, Headlights, volt meter. Wait light blinks on the crank. Just where are the circuit breakers? I know of the one next to the steering column but that should be self resetting. What an I missing????? Also not getting the "thump" from the PBC box. Is there a manual reset breaker somewhere?

    Thanks guys,

    Mark
    Last edited by MarkM; 08-13-2019 at 12:16.
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    3 Star General Dock Rocker's Avatar
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    Did you unhook your batteries when you changed your box?

    There are no circuit breakers in that system.

    Did you get the correct temp sender for the box you installed?



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    Colonel MarkM's Avatar
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    I did disconnect the batteries but found water in the old box so something shorted out. Would a bad temp unit cause these issues? I don't believe so. The boxes had the same model number. I put the dried out control box back in just for testing and it has the same issue. No headlights but does have running lights. No wait light and dash bat gauge is not working and is all the way red so no power. I did today changed out the glow plugs.

    Thanks,

    Mark
    Last edited by MarkM; 08-13-2019 at 14:29.
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    3 Star General Dock Rocker's Avatar
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    Do you have a keyed start switch? Or do you still have the original start leaver?

    If you have an aftermarket keyed switch that is likely your problem. Remove it and put the factory piece back in.

    If itís not that it is likely a ground issue.


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    The only box that "thumps" is the original Prestolite PCB. That thump is the main power contactor pulling in. Everything after the Prestolite box didn't do that. Go online and find yourself an S3 box, one with the additional small connector on the side. They use a temp sensor instead of a glow plug controller so they get changed as a pair. Do a little search here on SS and you'll find several good posts about what goes together and what the latest and greatest configuration is.

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