 Acceptable voltage discrepancy, Voltage at dash vs. voltage at battery |
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| 98101 |
 Nov 24 2017, 06:26 PM
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Michael in Seattle  Group: Members Posts: 373 Joined: 7-October 17 From: Seattle, WA Member No.: 21,495 Region Association: Pacific Northwest  |
I started my car after sitting a few days and noticed the dash voltage meter went up over 15V. In Tech Tips 700 I read that overvoltage could lead to battery acid spills, so I quickly shut it off.
Prior to that, I'd noticed the dash gauge reads lower than I'd like when all the lights are on. I checked the voltage at the battery under different circumstances and they weren't so extreme in either direction. So now I'm wondering what the acceptable differences would be before you'd start to expect a poor (ground?) connection somewhere? https://www.youtube.com/watch?v=S6BcQC-cjXo |
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Nov 25 2017, 10:57 AM
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#2
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can't remember Group: Members Posts: 3,156 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest 
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QUOTE(98101 @ Nov 24 2017, 04:26 PM)  I started my car after sitting a few days and noticed the dash voltage meter went up over 15V. In Tech Tips 700 I read that overvoltage could lead to battery acid spills, so I quickly shut it off. Prior to that, I'd noticed the dash gauge reads lower than I'd like when all the lights are on. I checked the voltage at the battery under different circumstances and they weren't so extreme in either direction. So now I'm wondering what the acceptable differences would be before you'd start to expect a poor (ground?) connection somewhere? https://www.youtube.com/watch?v=S6BcQC-cjXo With multiple voltage meters, alternators, batteries and voltage regulators my lights on always causes a significant voltage drop - say at least a half a volt. The stock alternator is not the biggest in the world. Say about 10 amps to the headlights alone along with the marker lights along with the gauges and running the motor. It all adds up. |
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Posts in this topic
98101 Acceptable voltage discrepancy Nov 24 2017, 06:26 PM
Mike Bellis Most alternators do not charge much at all at idle... Nov 24 2017, 06:35 PM Spoke There is a lot of resistance in the 40+ year old w... Nov 24 2017, 07:20 PM
98101 Thanks Mike and Spoke.
I was also confused by th... Nov 24 2017, 08:07 PM Mike Bellis
Thanks Mike and Spoke.
I was also confused by t... Nov 24 2017, 08:49 PM 98101
I see -15 Amps and +11 Volts when you start it. T... Nov 24 2017, 11:37 PM cary Seeing the same issue for years. I circumvented th... Nov 24 2017, 11:14 PM Spoke Short bursts of 16V on the battery should cause no... Nov 25 2017, 08:29 AM porschetub
Short bursts of 16V on the battery should cause n... Nov 25 2017, 05:26 PM 98101
Do you have a schematic of how the ammeter is con... Nov 25 2017, 05:59 PM worn
Previous owner(s) may not have been electrical wi... Nov 25 2017, 08:40 PM porschetub
Do you have a schematic of how the ammeter is co... Nov 26 2017, 12:42 AM |
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