 volt gauge |
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| StratPlayer |
 Aug 30 2012, 09:17 AM
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#1
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StratPlayer  Group: Members Posts: 3,278 Joined: 27-December 02 From: SLC, Utah Member No.: 27 Region Association: Rocky Mountains 
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What is the main cause of a volt gauge showing a negative reading when the car is running?
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| Valy |
Aug 30 2012, 09:33 AM
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#2
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Senior Member Group: Members Posts: 1,675 Joined: 6-April 10 From: Sunnyvale, CA Member No.: 11,573 Region Association: Northern California |
What do you read exactly?
There is no negative range on the gauge. |
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| walterolin |
Aug 30 2012, 09:41 AM
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#3
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Senior Member Group: Members Posts: 685 Joined: 30-November 11 From: Louisville, Ky Member No.: 13,838 Region Association: South East States |
Valy is correct. If it is a mechanical (d'Arsvonval) meter it will only read negative if it has a zero in the center. If it is digital (say a Fluke 179), and it is reading negative, you have the leads reversed.
Olin |
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| 76-914 |
Aug 30 2012, 09:51 AM
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#4
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,500 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California
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If its the one in the console; just about anything. Because of its location in the "chain" it is basically starved for current. A 15w bulb activated will make it read below 12v.
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| Spoke |
Aug 30 2012, 11:24 AM
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#5
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Jerry Group: Members Posts: 6,978 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
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The wires are backwards. The meter only has graduations for positive voltage. reverse the wires and and you measure negative voltage.
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| toolguy |
Aug 30 2012, 12:04 PM
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#6
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Senior Member Group: Members Posts: 1,267 Joined: 2-April 11 From: San Diego / El Cajon Member No.: 12,889 Region Association: Southern California
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please clarify your question before reversing any wires. . what do you mean 'reads negative' ?? is this a stock meter, reading from 0 up to whatever positive, or does it have a 0 in the middle and one side neg 12 and the other side pos 12??
If you reverse the leads inappropriately, you'll at best peg the needle and that can bend it. . the terminals on the rear of the meter should be labeled This is when a picture is worth a thousand words. . OR are you talking about a VOM hand held mult-meter. . If yes, then reverse the leads. . red to positive |
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