Paul,
it sounds like a voltage fluctuation to me. I've seen F*rds do this when
their instrument voltage regulator was bad, but Chevys don't have one of
those.
Do the headlights do the same thing? You can't tell from the D-C gauge
because it's just an ammeter. Take a voltmeter and check your voltage at
the ignition switch with it on (it's easier to get to than the gauge).
It may be the vehicle voltage regulator kicking in and out. Open the
hood and listen to see if it is clicking at the same rate as the guage
fluctuation.
--
John "49-50-54-57-79-95" Chevy 3800 Panel
Paul W. Franchina wrote:
>
> Boris had his first jaunt yesterday evening after months of downtime for
> refurbishment. We didn't go far but the results of my efforts were very
> rewarding. The steering is smooth and effortless by comparison to the day
> he came home. The brakes are going to do their appointed job with force to
> spare. One thing I did notice however was the gas gauge going nuts. When I
> turned the ignition on the needle immediately jumped to near half tank
> reading. Withiin a few seconds it started jumping to full scale then
> falling back to the initial reading with a cycle period of a bit over a
> second. It kept this routine up until I turned the ignition off. I haven't
> looked at the wiring to the tank but the under dash area is such a rat's
> nest I'm not sure I could ever figure things out. Has anyone experienced
> these symptoms and what turned out to be the cause/cure?
>
> Paul W. Franchina
> pfoxtrot@gate.net
> & Boris: 1958 Chevrolet Apache 3100 Stepside
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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