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e vassar · 09-13-2020, 02:08 PM

I ran across a digital voltmeter in a old tool box. I don't remember where it came from. I put the red and black wires across a battery, and it works! Even flashes on and off under 12V. So I think im going to install it in my car.Here's my question. There is also a purple wire on it. What could that be for?

09-13-2020, 02:08 PM	#1
e vassar Member Join Date: Jul 2015 Posts: 382 Likes: 67 Liked 271 Times in 107 Posts	Digital Voltmeter Wiring I ran across a digital voltmeter in a old tool box. I don't remember where it came from. I put the red and black wires across a battery, and it works! Even flashes on and off under 12V. So I think im going to install it in my car.Here's my question. There is also a purple wire on it. What could that be for?