Erattic Differential Gauge

[THoltz]

Not too long ago I had some gauges installed, among them a differential temperature gauge. Lately, the indicator needle will experience small (20 degrees or so) but rapid deflections and then stabalize again. Any ideas? Anybody know the charateristics of deflections if it is a bad ground or power connection? In other words, would the meter fail low, high, or as is.



An autometer vendor rep can jump in here any time if they have some technical info. Thanks!

 

[Diesel Manor]

On that gauge, if you ground out the sensor wire to the chasis, the needle should go to full sweep. So if the guage is bouncing, could be a bad ground. If your test goes to full sweep, then the gauge is fine. You'll need a better ground. We've done a write up on our installation sheets page that might help. Look for DieselManor Tech Tip - Supplemental Grounding Instructions for Temperature Senders

 

[THoltz]

Thanks very much for the help, I will check it out.