> To: Dave Gropper <dave_gropper@rl.gov>
> Reply-To: "Ernest E. Gilbert" <barrister@lawref.com>
>
> Q3. READ MY WRITS(!!) Engine OFF, Ignition OFF, pull car into sun in
> driveway Tach reads 0 r.p.m.... sun warms up car, tach starts to
> read... After a while (with a COLD Unstarted Engine) Tach reads over
> 3000 r.p.m. HELP!!
>
> Tach is an ammeter, that is it reads current through it. Circuit is
> from ignition switch (white wire gets power only with key on) - through
> tach - through points - through coil primary winding - and thence to
> ground. To read with the key off the ammeter must be getting power from
> somewhere between keyswitch and ammeter. This white wire is in the same
> harness as the white wire for the ignition lite which is famous for
> melting down when the alternator fails because they are in the same
> harness. In my case they fused together after the ammeter supplying
> power to the points and coil with the key off. Hard to shut off. My
> guess is a high resistance short in the keyswitch or the wires coming
> from it.
>
>
This can be confirmed by disconnecting the battery and checking to see
if the tach drops back to 0 (zero).
- -Mark
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