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  On second voltmeter in one year

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Author Topic:   On second voltmeter in one year
masbama posted 09-20-2009 09:39 PM ET (US)   Profile for masbama   Send Email to masbama  
I thought my [boat's voltmeter] was bad because it [indicated over 18-volts] even when engine was not running. I replaced it, and the new one worked fine until recently. Now it does the same. I tested the battery with a meter and it read 12-volts when engine not running and a little more when running; not [over 18-volts]. Any thoughts as to what is causing this?
Chuck Tribolet posted 09-21-2009 12:25 AM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
Just for grins, I'd measure the voltage across the the
voltmeter, ignition off. It will and should (and probably will)
read zero.

I'd guess you have subjected the voltmeter to a serious
shock, and the needle has jumped off its mounts. I've
managed to do this to a couple of mechanical meters over the
years.

What brand and model of meter? What boat?


Chuck

masbama posted 09-21-2009 09:34 AM ET (US)     Profile for masbama  Send Email to masbama     
It's a 1999 18' Dauntless with a 150hp 2 stroke Evinrude OceanPro. It is the standard OMC gauge. Thanks! I had to buy one last year and one this year. When I trim down the gauge will read 12 volts or less while trimming but shoots back up to 18 plus at rest.
jimh posted 09-21-2009 08:11 PM ET (US)     Profile for jimh  Send Email to jimh     
The only method I know for testing a voltmeter is to compare its readings with a second voltmeter wired in parallel. The second voltmeter has to have known accuracy and calibration. A multimeter with a known accuracy of calibration makes a good secondary standard for comparison with the dash panel voltmeter in a small boat's electrical system.

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