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Ammeter to voltmeter #2638974
03/30/19 08:55 PM
03/30/19 08:55 PM
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cdstl Offline OP
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I just got my Cuda's standard dash back from Instrument Specialties. Looks good. I had them convert the ammeter to a voltmeter.

So, now how do I hook it up?

Thanks


1972 Cuda 340 4 speed, 2001 Ram CTD 4x4 6 speed, 1970 Duster 408 4 speed, 2001 Ram 5.2 4x4 auto, 1996 Ram 5.9 2x4 auto, 1965 Satellite 4 speed
Re: Ammeter to voltmeter [Re: cdstl] #2638997
03/30/19 10:06 PM
03/30/19 10:06 PM
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neg to ground. positive to switched 12V, not sure where the best pickup point would be, maybe a switched circuit in the fuse box. EDIT or maybe the blue wire ign1 circuit as that is what the "system" is seeing at any point in time.

Last edited by RapidRobert; 03/30/19 10:14 PM.

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Re: Ammeter to voltmeter [Re: cdstl] #2639036
03/30/19 11:59 PM
03/30/19 11:59 PM
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Now you have a Voltmeter: Great for monitoring Alt./V-reg operation. But Now how do you monitor battery state while operating car: Charged-Charging-DisCharging?

Re: Ammeter to voltmeter [Re: PhillyRag] #2639037
03/31/19 12:27 AM
03/31/19 12:27 AM
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383man Offline
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Voltmeter gets hooked parallel and ammeter in series. Ron

Re: Ammeter to voltmeter [Re: PhillyRag] #2639053
03/31/19 02:57 AM
03/31/19 02:57 AM
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Originally Posted by PhillyRag
Now you have a Voltmeter: Great for monitoring Alt./V-reg operation. But Now how do you monitor battery state while operating car: Charged-Charging-DisCharging?


If the voltmeter is up it is charging. 13.5-14.5 volts is good or you can tell visually with some experience if no numbers (like mine). If voltage is down it is not. I spotted a failing alternator - no charge - by occasional unusual fluctuations in the voltage.

I hooked mine to the 12 volt feed used to power the instrument panel... it is switched and works fine.

Re: Ammeter to voltmeter [Re: PhillyRag] #2639077
03/31/19 08:21 AM
03/31/19 08:21 AM
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Originally Posted by PhillyRag
Now you have a Voltmeter: Great for monitoring Alt./V-reg operation. But Now how do you monitor battery state while operating car: Charged-Charging-DisCharging?


I also eliminated a fire hazard.

Gonna post a picture soon. I was gonna give IS a call, but it's the weekend. Probably won't be able to get to it until next weekend anyway.

Thanks


1972 Cuda 340 4 speed, 2001 Ram CTD 4x4 6 speed, 1970 Duster 408 4 speed, 2001 Ram 5.2 4x4 auto, 1996 Ram 5.9 2x4 auto, 1965 Satellite 4 speed
Re: Ammeter to voltmeter [Re: cdstl] #2639081
03/31/19 08:27 AM
03/31/19 08:27 AM
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Here’s what I have now.

2F1F2D3F-B2CA-460D-A92A-160C4FF27D68.jpeg

1972 Cuda 340 4 speed, 2001 Ram CTD 4x4 6 speed, 1970 Duster 408 4 speed, 2001 Ram 5.2 4x4 auto, 1996 Ram 5.9 2x4 auto, 1965 Satellite 4 speed
Re: Ammeter to voltmeter [Re: ahy] #2639466
04/01/19 02:14 AM
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Originally Posted by ahy
Originally Posted by PhillyRag
Now you have a Voltmeter: Great for monitoring Alt./V-reg operation. But Now how do you monitor battery state while operating car: Charged-Charging-DisCharging?


If the voltmeter is up it is charging. 13.5-14.5 volts is good or you can tell visually with some experience if no numbers (like mine). If voltage is down it is not. I spotted a failing alternator - no charge - by occasional unusual fluctuations in the voltage.
.

While monitoring voltage is helpful; it's still only an Indirect means of monitoring state-of-battery.
With a "healthy" battery & an alt. able to handle any system loads; the ammeter typically only sees
a moderate amp load for a relatively short period: (minor recharge after a start)..

Re: Ammeter to voltmeter [Re: cdstl] #2639572
04/01/19 10:47 AM
04/01/19 10:47 AM
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You just need to attach 12 volts and ground to hook up a voltmeter.







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