Instead of a lighter socket, I added a power receptacle to the side of the console so I could still operate plug-in accessories. Since I'm not a smoker I removed the cigarrette lighter and installed the gauge in its place. Installation of Voltmeter Wires: Wire the meter as shown below. In mine I haven't seen a significant difference. that may be necessary to correctly install. If you want a more accurate reading of actual battery voltage then you can do a comparison check with the key set to accessory position and turn off all lights and other accessories. The light for the gauge should be wired into the dimmer circuit for the interior lights. Or just wire it to the alternator directly. You could take it from the cigar lighter, radio, HVAC circuit, etc. You can take power from any circuit you want that is hot when the ignition is on. The voltage drop on this lead is not large enough to be concerned about because the current load on it is not usually high. Since it's a Voltmeter, it's pretty easy to wire. I used this lead to power the voltmeter in mine as it was located conveniently close to where I mounted the meter. Your 78 has a white with green stripe wire that is used to power the radio in both key positions. It should be connected to a lead that is switched power when the key is turned to both the accessory and ignition positions. I recommend not to connect the voltmeter to an always-on power source, it will drain the battery when the car is not in use. Sep 17 Installing New Wiring Harnesse.a loose connection at the gauge, an open circuit in the gauge wiring. Sep 18 Installing New Wiring Harnesse. 14 WIRE VR CONNECTOR To do a full field test on a Ford with an external regulator.Sep 25 Splash Panel Seals & Crimper(7.

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Oct 23 ALSouth Alabama British Car Fes.Oct 14 TXTMGR Fall Gathering of the Fa.Oct 10 VAHunt Country Classic British. Unlike our AD448 two wire voltmeter, this meter has a third wire for the measured voltage allowing for a greater range of measurement.Oct 01 VAShenandoah Valley British Car.

How to wire voltmeter gauge