Go BottomNew Holland Boomer NH TC45 Temperature guage problem
 | DanielDan
Join Date: Posts: 1 
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2002-11-03 44569
I first noticed my temperature guage wasn't raising as far as it should have after a good workout. Then I ran out of gas with the guage showing a little gas left. Anyone else?
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley 
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2002-11-04 44578
There have been some gauge problems discussed here but I don't have the impression that it's a general problem. It's probably easier to just be aware that the gauges are off. If there is interest in tracking down the problem, then this blurb is at least an organized way to think about it.
Off the top of my head, the combination of a low reading temp gauge and a high reading fuel gauge may result from the same problem. Here's my reasoning, and hope I don't get it backwards. Gauges are ammeters. It takes current to deflect them from the resting points, and full-scale deflection is max current for the gauge.
My Ford 1710 gauges at rest are temp=hot and fuel=empty. Cold on the gauge would be a high current/low resistance condition, and the resistance would increase as the engine heats. Assuming the gauge is OK, a low reading gauge could result from either low resistance or high voltage. The fuel gauge works in reverse. A high reading fuel gauge could result from low resistance or high voltage--same as for a low reading temp gauge.
I tend to mistrust coincidence and suspect that two things happening together with the same explanation likely have a single cause. It's tempting to think that high alternator output might be the cause. However, I think that gauges have a ballast that produces a reference voltage so gauges aren't affected by battery voltage swings. I seem to recall that 9V produces full scale deflection, and 9V batteries are sometimes used in testing gauges. I can't find a common ballast in my 1710 wiring diagram, so the gauges probably have internal ballast. If a common ballast was present, it would be a good place to look. A faulty unit or bad ground might produce the problem. Of course, my reasoning may be backwards.
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