Voltmeter
Thread Starter
Racer
Joined: Aug 2005
Posts: 377
Likes: 41
From: Highland IN
Voltmeter
I had my ammeter converted to a voltmeter years ago on my 63. Just finished my American auto wire install. I had tested along the way and everything was working. Now that i am done my voltmeter is not working. I measure voltage on the bolts on the back. But gauge not reading. I checked and it has a good ground. Thoughts????
Thread Starter
Racer
Joined: Aug 2005
Posts: 377
Likes: 41
From: Highland IN
It has worked for years
i tested a couple times during the install of the harness and it worked
i measured the voltage on the back. At the post and it measures correct. Gauge just won’t read
i tested a couple times during the install of the harness and it worked
i measured the voltage on the back. At the post and it measures correct. Gauge just won’t read
Racer
Joined: Dec 2005
Posts: 388
Likes: 220
From: Seattle
Team Owner
Joined: Jul 2006
Posts: 22,202
Likes: 4,187
From: Kannapolis NC
I don't see a wire on the other gauge post. One for one side of the gauge, one for the other post on the gauge. The case doesn't need a ground on an aftermarket voltmeter. The way yours is connected (it looks like to me), nothing is flowing through the gauge winding, so no deflection.
Leave the ign off, connect a small square 9v battery (like used in a smoke detector) across the two upper posts and see if your gauge doesn't show 9v.
Leave the ign off, connect a small square 9v battery (like used in a smoke detector) across the two upper posts and see if your gauge doesn't show 9v.
Thread Starter
Racer
Joined: Aug 2005
Posts: 377
Likes: 41
From: Highland IN
I can add a ground to the post. But it never had one. Look at the attached pic. It says that post is grounded through the dash. It worked during early test after i had it partially installed. The battery was always disconnected during circuit connections.
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Team Owner
Joined: Jul 2006
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From: Kannapolis NC
Is one of the posts supposed to be connected to the light or does your voltage gauge not have a light? Or a light that comes on with the ignition? You should've gotten a diagram with the gauge.
Team Owner
Joined: Apr 2008
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From: Middle TN by way of KY, OH, VA, IL, CA, FL, NY, SC, HI
I may be looking at this wrong, but the picture appears to show only one wire - the dark red one - attached to a terminal on your voltmeter. Is that supposed to be a single wire application wiring?
Thread Starter
Racer
Joined: Aug 2005
Posts: 377
Likes: 41
From: Highland IN
I did fix it, but it was on accident. The positive wire goes to the mounting post, then that is a resistor that goes over to the positive post. the negative goes through the case. It has worked since I had it built. Not sure what happened, but was not reading at all. I got under the dash and checked voltage and it was good on both posts, the one with the wire and the other on the other side of the resistor. So I was going to wire to a nine volt battery just to check another way. Had the test wires connected to the post opposite of the wire connection and on the neg post. As I was about to hook up to batter, the other side of the test wires touched the door sill and shorted, this shocked the gauge and seemed to wake it up. it did not peg. has worked since.