 Volt meter question, Secondary added question |
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| Menmojo |
 Jul 26 2022, 08:14 PM
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#1
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Porsche addict  Group: Members Posts: 49 Joined: 7-July 15 From: Midwest Member No.: 18,929 Region Association: None  |
I’m working on a 1975 914. I just replaced a non working volt meter with a working period correct vdo volt meter. When the car is shut off the volt meter is reading the voltage.
Is this correct? Is the volt meter supposed to be switched on with the ignition or does it always show the voltage? I’m concerned that it will slowly drain the battery. The car has the stock wiring harness and originally came with a center gauge package. |
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| bbrock |
Jul 26 2022, 08:58 PM
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#2
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains 
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I'm wondering if you have it plugged into the clock wire by mistake. That one would be powered all the time.
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| Menmojo |
Jul 26 2022, 09:14 PM
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#3
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Porsche addict Group: Members Posts: 49 Joined: 7-July 15 From: Midwest Member No.: 18,929 Region Association: None |
QUOTE(bbrock @ Jul 26 2022, 06:58 PM)  I'm wondering if you have it plugged into the clock wire by mistake. That one would be powered all the time. That’s a very valid point! I’m going to check. That could definetly be the problem since the clock isn’t working! |
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| Menmojo |
Jul 26 2022, 09:57 PM
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#4
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Porsche addict Group: Members Posts: 49 Joined: 7-July 15 From: Midwest Member No.: 18,929 Region Association: None |
QUOTE(Menmojo @ Jul 26 2022, 07:14 PM) QUOTE(bbrock @ Jul 26 2022, 06:58 PM) I'm wondering if you have it plugged into the clock wire by mistake. That one would be powered all the time. That’s a very valid point! I’m going to check. That could definetly be the problem since the clock isn’t working! Bingo. That fixed one problem. The clock wires and voltage gauge wires were incorrectly plugged in and reversed. Now the volt meter only works when the ignition is on. New question: When I turn on the headlights the volt meter drops to zero. I measured the voltage at the battery and it’s still roughly 13.7 volts so I know the charging system is working. What would cause the volt meter to drop to zero when the lights are on? |
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| Spoke |
Jul 27 2022, 06:28 AM
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#5
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Jerry Group: Members Posts: 6,991 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
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QUOTE(Menmojo @ Jul 26 2022, 11:57 PM) New question: When I turn on the headlights the volt meter drops to zero. I measured the voltage at the battery and it’s still roughly 13.7 volts so I know the charging system is working. What would cause the volt meter to drop to zero when the lights are on? It sounds like you've hit on the wrong wire. Find a fuse maybe fuse 9 which also powers the GEN light. I believe this one turns off. The positioning of the voltmeter in the 914 wire harness is not optimal. When lights, ventilation fan are on, the voltmeter likely will read a bit less than the battery. It's only use is as a rough estimation of battery voltage. As some say, it's just for vanity. For me, it gives a good indication of battery voltage when I first turn the car on and running no lights or fans. |
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Posts in this topic
Menmojo Volt meter question Jul 26 2022, 08:14 PM
914Sixer Not wired correctly, showld not be on when igniti... Jul 26 2022, 08:26 PM emerygt350 Yeah, definitely not on. It's best to rewire ... Jul 26 2022, 08:36 PM rjames The volt meter could just be inaccurate- not uncom... Jul 26 2022, 11:12 PM emerygt350 As I said, with the original wiring it is worthles... Jul 27 2022, 04:19 AM
slotty008
As I said, with the original wiring it is worthle... Jul 29 2022, 02:05 PM GregAmy Crappy voltmeter is one of the reasons (space bein... Jul 27 2022, 06:51 AM emerygt350
Crappy voltmeter is one of the reasons (space bei... Jul 27 2022, 07:34 AM GregAmy I think I approach this more like a pilot. They h... Jul 27 2022, 07:48 AM emerygt350 Yeah, simplicity has it's attraction, but so m... Jul 27 2022, 10:11 AM bbrock I like the voltmeter and even its faults. Mine ac... Jul 27 2022, 06:09 PM emerygt350 That actually demonstrates why the original wiring... Jul 27 2022, 06:48 PM fixer34 Connect the voltmeter to the point you want to mea... Jul 29 2022, 06:02 PM |
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