CGT h2o/fuel gauges too low, after voltage stabilizer

[Ken]

Hi Dave,

My concern isn't "trim adjustment" (fine tuning?), I'm trying to ensure that the gauges are sweeping their full range.  Currently, they do not go above half under any circumstances, such as a full tank of gas.

I'm going to troubleshoot the senders and the thermostat as Ti suggested.

Thanks,

Ken

Quoting David.Ullrich at ferguson.com:

> What about just moving the faces? You can adjust the faceplate up and down on
> most 4k & CGTs unless you have the digi-dash like I do...
>
> -----Original Message-----
> From: Ti Kan [mailto:ti at amb.org]
>
> Ken writes:
> > On my '86 Coupe GT, the water temp and fuel gauges read too low.  I have
> replaced the voltage stabilizer/regulator with an untested new one sourced
> from a list vendor.  It did not fix the problem.
> >
> > What is the next level of troubleshooting I can perform to fix this?  Do
> the gauges themselves fail in some other way?
> >
> > I'm sure I'm supposed to test the new voltage regulator, which means I need
> to buy some test equipment.
>
> The voltage stabilizer regulates the voltage to 10V, so you can simply
> measure with a DC voltmeter if you have one.  These stabilizers rarely
> fail by supplying low voltage, however.  They're usually working or
> not working at all.  I suspect that your fuel gauge problem may be
> a sender problem at the tank.  As to the coolant temp gauge, perhaps
> it's also a sender problem, or perhaps you are running thermostat that
> has too cold an opening temperature?