Hi Dave,
Could be the 10V voltage stabalized screwed to the back of the speedometer
has a poor ground. The speedo needs to be grounded, usually with a black wire
on one of the gauge case post thumbscrews. The heater fan works off that
circuit as well - check it for power.
Jeff
---- David Friedlander via 6pack <6pack@autox.team.net> wrote:
> Hey all;
>
> I have been trying to track down the gremlin that's keeping my fuel and
> temp gauges
> from working. I'll start up the car and those two gauges don't function
> (the voltage
> and oil pressure gauges work fine). After maybe 15 or 20 minutes of
> driving, they'll
> suddenly kick on and stay on for the rest of the trip. Some trips, they
> don't come on
> at all. But when one comes on, they both come on. Strangely, when they
> don't work,
> neither do my turn signals! I've spent the afternoon tracing wires for
> power (light
> green) and ground wires (green w/blue for temp gauge green and black for
> the fuel
> gauge). Getting to the gauges can be quite the challenge. Any comments?
> Faulty voltage
> stabilizer, perhaps? I've replaced that in the past...
>
> Dave Friedlander
> '74 Six
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