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Old November 11th, 2016   #1
ligito
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Default Digital DC voltmeter

I have a digital voltmeter in my truck.

It is not switched and it is hot all of the time.
Should I just switch it, or wire it so it comes on when I start the vehicle?
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Old November 11th, 2016   #2
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Default Re: Digital DC voltmeter

Depends on how many amps it is drawing to operate its display and how often you drive the truck. If we are talking a milliamp draw and the truck does not sit for weeks on end, what can it hurt? On the other hand, all the factory instruments switch on and off with the key so...
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Old November 11th, 2016   #3
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Default Re: Digital DC voltmeter

OK, for the meantime, I rerouted the positive wire and left it disconnected until I can find a wire that is hot, when running, to connect to.

I just need to get it back together.
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Old November 12th, 2016   #4
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Default Re: Digital DC voltmeter

Quote:
Originally Posted by ligito View Post
Should I just switch it, or wire it so it comes on when I start the vehicle?
Depends if you want to check the voltage without switching it on.
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Old November 12th, 2016   #5
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Default Re: Digital DC voltmeter

Quote:
Originally Posted by Rob2m View Post
Depends if you want to check the voltage without switching it on.
Is best choice would be to connect it on a wire coming from the (acc) accessory side of the ignition switch .

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Old November 12th, 2016   #6
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Default

I used a relay, triggered by a key-on circuit to connect the meter directly to the battery. Connecting to a key-on circuit doesn't provide true battery voltage.


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Old November 12th, 2016   #7
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Default Re: Digital DC voltmeter

Quote:
Originally Posted by Wjbertrand View Post
I used a relay, triggered by a key-on circuit to connect the meter directly to the battery. Connecting to a key-on circuit doesn't provide true battery voltage.


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This ^^^ is Very True. It adds some complication but is the best way IMO.
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Old November 12th, 2016   #8
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Default Re: Digital DC voltmeter

I can't locate the wires that come on with the switch, without firing the airbag.
I know the wire colors but I can't find them.
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Old November 12th, 2016   #9
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Default Re: Digital DC voltmeter

Did this vehicle not have a voltmeter from the factory? What is this vehicle? Perhaps we can attack better if we know our enemy.
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Old November 13th, 2016   #10
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Default Re: Digital DC voltmeter

It has an idiot voltmeter in the instrument cluster.
There is a digital voltmeter in the panel that I'm adding to the lower dash, along
with some switches and a power point.
Ford F250SD 1999.
My most recent money pit.
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