 Volt Meter Reading Analysis Needed |
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| Ansbacher |
 Mar 9 2015, 06:54 PM
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#1
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Senior Member  Group: Members Posts: 689 Joined: 4-July 14 From: Tampa Bay, Florida Member No.: 17,589  |
Simple question, I think. With engine running and no extra electrical loads turned on, my voltmeter reads a bit over 13 Volts. Turn on headlights and voltage drops to a bit above 12 Volts. Is that a normal drop or is something going on with the voltage regulator or alternator?
Ansbacher |
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| Spoke |
Mar 9 2015, 09:00 PM
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#2
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Jerry Group: Members Posts: 6,992 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None 
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The voltage you measure is expected of the center console voltmeter. I checked the voltmeter in my car with my multimeter and it was less than 0.25V different than my multimeter.
The voltage drop you're seeing with the lights on is a simple IR (current x resistance) voltage drop of 40+ year old wiring and connectors. You might get rid of some of the voltage drop by cleaning all grounds and battery connections. |
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Posts in this topic
Ansbacher Volt Meter Reading Analysis Needed Mar 9 2015, 06:54 PM
r_towle At idle, normal.
At high revs, not normal. Mar 9 2015, 06:58 PM dlee6204 I would say it's normal if Youre reading off t... Mar 9 2015, 07:02 PM Tom Depends on where the reading was being taken from.... Mar 9 2015, 07:06 PM screenguy914 Unless cranking the engine, system voltage should ... Mar 9 2015, 07:43 PM
Ansbacher Yes, I was reading volts from the center console g... Mar 9 2015, 07:54 PM Mike Bellis Almost ALL old car alternators make little or no o... Mar 9 2015, 08:44 PM 76-914 That is one inaccurate gage. Everyone has that res... Mar 9 2015, 09:00 PM Dave_Darling The center console voltmeter is mostly there for ... Mar 10 2015, 12:55 AM euro911 My center console voltmeter reads a little above 1... Mar 10 2015, 03:02 AM somd914
My center console voltmeter reads a little above ... Mar 10 2015, 03:46 AM The Cabinetmaker I'm gonna call foul on the old wiring thing. T... Mar 10 2015, 06:04 AM euro911 32 had passed by the time I acquired the 'BB... Mar 10 2015, 10:31 PM |
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