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- Greenback, TN
My dash voltmeter in the LMTV dropped from 'correct' to 'not correct' on a trip. Turning off the truck indicates the 'not correct' reading is same as powered off. The voltmeter is dead.
Just as a sanity check, the voltage was checked at alternator output, and is good. Tested at 24 v terminal in the Power Distribution panel shows correct voltage.
A DVM probe into the meter's disconnect plug, truck side, showed correct voltage'.
Took the voltmeter out and tested it on the bench. Yup, inputting 28 vdc to black and red terminals does nothing, and no resistance between those terminals either. The lamp in the meter works just fine.
Looks like the meter movement has opened up. Has anyone done a bench test on a voltmeter? If that worked, please let me know.
Any spares around? On second thought though, this is a good time to install a more accurate meter, and to add a 12v circuit voltmeter.
This is what I am ordering:
https://powerwerx.com/panel-dual-volt-meter-red
I'll have to make a couple of adapter plates to mount the smaller meter. A photo will be added when it's done.
Just as a sanity check, the voltage was checked at alternator output, and is good. Tested at 24 v terminal in the Power Distribution panel shows correct voltage.
A DVM probe into the meter's disconnect plug, truck side, showed correct voltage'.
Took the voltmeter out and tested it on the bench. Yup, inputting 28 vdc to black and red terminals does nothing, and no resistance between those terminals either. The lamp in the meter works just fine.
Looks like the meter movement has opened up. Has anyone done a bench test on a voltmeter? If that worked, please let me know.
Any spares around? On second thought though, this is a good time to install a more accurate meter, and to add a 12v circuit voltmeter.
This is what I am ordering:
https://powerwerx.com/panel-dual-volt-meter-red
I'll have to make a couple of adapter plates to mount the smaller meter. A photo will be added when it's done.
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