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Old 09-28-2017, 04:10 PM   #1
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dash voltmeter

With engine running, testing the voltage at the batteries indicates about 14.3 volts, but my dash voltmeter is in the 17+ volt range, any help on the difference, both of my batteries are less than 6 months old.

Not sure how accurate the meter in the dash is since it is from 1998, however, it has moved up from about 16 volts with engine running?
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Old 09-28-2017, 05:26 PM   #2
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Dash voltmeter is slightly different on my 2003 from the SilverLeaf and from the plug-in meter in my 12v access. plug, but all are within a few 10th of a volt. Typical alternator puts out between 13.8v and maybe 14.5v, based on circumstances. 16v and 17+v are way out of range--dash meter is probably bad....
PS--older Alpines use a diode battery isolator that depresses alternator output by a 10th of a volt or more....
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Old 09-28-2017, 09:42 PM   #3
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hunter27h,
I have the same problem. Spent $$$ determining it was the dash voltage gage that was malfunctioning. The curved piece that encloses the gages comes off. Access the gage from here if you want to replace.
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Old 09-29-2017, 07:29 PM   #4
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Start by confirming actual voltage AT EACH BATTERY BANK.

Let us know what you find.
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Old 10-02-2017, 06:18 AM   #5
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I did check each battery individually, prior to posting to the forum, and thank you for your suggestion.
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Old 10-02-2017, 03:05 PM   #6
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opened the back of the guages today and checked voltage on the back of the voltmeter, at engine idle, 13.83 volts with a digital meter, with the dash meter reading 16-17 volts, so it's definitely a "tired" voltmeter, and time to replace.

Thanks for all the help!
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Old 10-03-2017, 03:51 PM   #7
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My 2000 did the same thing. It's definitely your gauge. Mine finally pegged after about 2 years.
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Old 10-09-2017, 07:40 AM   #8
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Replaced the gage temporarily with one from amazon, while I look for a closer replacement, it was definitely the gage, thanks for all the help!
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