 Car loses a volt as the engine warms up..., weird one |
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| anthony |
 May 25 2004, 12:32 PM
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2270 club  Group: Benefactors Posts: 3,107 Joined: 1-February 03 From: SF Bay Area, CA Member No.: 218   |
Ok, here's the situation. When I start the car cold I get 13.2 volts across the battery terminals. Perfect, right?
As the temperature gauge moves towards the middle of the gauge I slowly loose more voltage until I'm down to 12.2 volts. Is this normal? I'm thinking that at full operating temperature with no accessores (lights, brake lights, etc) I should have full charging voltage. It seems that something is kicking in as the engine warms up and draws a full volt. Are there any D-Jet components that would draw voltage as the car warms up. The voltage drop is gradual. As the temperature gauge goes up the voltage gauge drops in sync. And this is not a faulty voltage gauge issue. I've verified this with a volt meter across the battery terminals. |
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| Joe Bob |
May 25 2004, 02:29 PM
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Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
What gauge are you looking at? The one in the dash? Or a multimeter across the terminals????
Dash gauges usually run thru the fused hot when ignition is on circuit(s)....this can give a low reading due to heat and impedence due to the resistance of dirty grounds or corroded fuses..... Best read is across the terminals when the car is hot with a GOOD multimeter. If you are STILL getting low reads, could be a alternator, regulator or BOTH taking a dump. Most FLAPS will do an in car load test and pinpoint the problem. |
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Posts in this topic
anthony Car loses a volt as the engine warms up... May 25 2004, 12:32 PM
SirAndy hot wires (and other electical components) have a ... May 25 2004, 12:49 PM davep Something is very wrong. A fully charged battery w... May 25 2004, 01:05 PM anthony QUOTE
davep <... May 25 2004, 01:38 PM lapuwali Check your alternator belt. I've had belts sl... May 25 2004, 02:34 PM anthony QUOTE
davep Engine not running, the battery should read 12.8 V... May 26 2004, 02:36 PM anthony Anyone know if our alternators have brushes that a... May 26 2004, 03:51 PM bob174 Check your voltage regulator. If it's never b... May 26 2004, 05:41 PM davep I think I have a new set of brushes, not for sale ... May 27 2004, 02:56 PM anthony I haven't got to it yet. I will have time on S... May 27 2004, 04:17 PM
anthony Problem solved! It was the voltage regulator. ... May 29 2004, 09:02 PM |
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