Ron;
On the back of the Instriment cluster, is a Voltage Limiter
(regulator). It's a little silver rectangular metal box with two plugs.
sounds like that is your problem.
It supplies not only 5 volts or so, but a steady 5 volts. It evens out
the normal variations due to engine speed. Most I've seen are just
plugged on to the printed circuit board.
Ray
On Oct 2, 2007, at 1:54 AM, David Homstad wrote:
Ron,
I had a 64 Dodge Coronet with a similar problem, many years ago. All
the voltage dependant gages (fuel, temp, oil) would be normal, and then
for just a second or 2 would shoot upscale and then return to normal
again. The amp gage was unaffected. It happened every few days. That
was caused by a “voltage limiter” device somewhere in the dash. It
limits the voltage to the gages. When all the gages move together, it
is a sign of a voltage problem. The cause may be the voltage limiter,
the voltage regulator, or a bad connection (battery terminals?) that
varies in resistance. Try driving with a voltmeter on the battery and
see if the system voltage varies.
Dave Homstad
56 Dodge D500
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