I just rebuilt the whole rig and put in a voltmeter in place of the old ammeter. We put very few miles on it with the ammeter after reviving it from its 10-year-slumber. I frankly don’t think I looked at the ammeter more than one or two times in the 5 times we drove it pre-tear down.
So I don’t know if it did this before, but I noticed a very strange occurrence and wondered if anyone else had ever seen this:
As the speedo drive cable turns, the voltmeter needle pulses. At freeway speed it just vibrates. When going 5mph it slowly pulses. It also jumps with the turn signal which was unexpected as I pulled the signal wire from a wire I thought would be pretty isolated. I believe I tapped into (properly spliced into) a wire I ran under the dash directly from the battery.
I have another voltmeter that is a little digital guy that is part of my usb plug outlet and it reads a little higher than the gauge but doesn’t seem to fluctuate.
Has anyone ever seen this? I’m thinking about taping a metal shield around the cable at the back of the gauge to isolate any emi it might be generating but wondered if anyone else had ran into it.
So I don’t know if it did this before, but I noticed a very strange occurrence and wondered if anyone else had ever seen this:
As the speedo drive cable turns, the voltmeter needle pulses. At freeway speed it just vibrates. When going 5mph it slowly pulses. It also jumps with the turn signal which was unexpected as I pulled the signal wire from a wire I thought would be pretty isolated. I believe I tapped into (properly spliced into) a wire I ran under the dash directly from the battery.
I have another voltmeter that is a little digital guy that is part of my usb plug outlet and it reads a little higher than the gauge but doesn’t seem to fluctuate.
Has anyone ever seen this? I’m thinking about taping a metal shield around the cable at the back of the gauge to isolate any emi it might be generating but wondered if anyone else had ran into it.
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