Pyrometer Issues

[DragNasty]

Got a question for you guys. When I cut my lights on, it drops about 800 degrees in temp. Makes me un easy on the accuracy of my guage. Anyone know what may be the cause?

[1999GMC]

If you turn your lights off it raises back up 800 degrees?

[DragNasty]

thats correct

[DragNasty]

But there are in no way wired together

[3bals]

Might be a ground issue???

Jody

[sixnickel]

It sounds like a ground to me. Is that pyro a amplifide type ? If so it is a
ground. If you have the guage mounted in a "A" post pod , plastic is not a ground. Try grounding the guage body with a wire to a good ground.
Rember the Golden Rule! When it makes sense check the positive side When at acts WACKY check the GROUNDS.

[DragNasty]

plastic is not a ground

You dont say! Its got a good ground so Im gonna try and use a different power source.

Thanks for the info as always guys.

[DragNasty]

It turns out that light for the gauge itself is what is causing the change in temp. So, I called Autometer and the rep told me that he couldnt tell what was up with it. He's gonna replace it with a new one, so hopefully the problem will be fixed.