Join Date: Mar 2002
Location: Austin, TX, USA
Re: Help with "strange" electrical issue....
If you think you have a ground issue, get a digital volt meter. Attach the black probe to the battery negative post. You might have to rig up a probe extension of some type. Attach the red probe to you guage ground. Then activate the gauge circuit and see if any voltage appears on your DVM. You should see less than 0.05 volts as a general rule. If you see 12V, your ground is not connected at all. If you see a lower voltage, the ground is bad.
You can use the same technique to debug the hot side - meter readings of less than 0.05 are beuno.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI