Nelson, Here is what the manual says:
ENGINE RUN-ON
If your engine continues to run even when the ignition is turned Off you are
experiencing engine Run-On. This usually only occurs on older vehicles
with an external voltage regulator. Because the MSD receives power directly
from the battery, it does not require much current to keep the unit
energized. If you are experiencing run-on, it is due to a small amount of
voltage going through the charging lamp indicator and feeding the small red
wire even though the key is off.
(Then it talks about Ford and GM circuits)
It explains how to install the diode in the charging lamp circuit to prevent
the feeding back of voltage through the circuit to the MSD unit.
Basically the diode is installed in line from the alternator to the lamp. The
stripe on the diode must be pointing toward the alternator.
That fixed the problem. (It did for me anyway!)
Regards,
Joe
Nelson Riedel wrote:
>
> Subject: Re: Problem with MSD Ignition in TR6
>
> > Nelson,
> > That problem is covered in the MSD installation instructions. It has to
> do with feedback causing the switch to in effect be bypassed by the ignition
> > light wiring.
> >
> > There is a diode included in the kit to remedy the problem.
> >
> > Regards,
> > Joe Curry
>
> Joe,
>
> Instructions? Diode? The guy who installed it for my friend must have
> thrown them out. Not sure I'd have read them anyway, sounds too much like
> asking for directions when I still have a half tank of fuel. Like their
> solution but sure hope they didn't say the problem was caused by feedback.
> The problem is that there is an unswitched power source (albeit it a
> relatively high impedance one) to the white wire circuit when the engine is
> running.
>
> Nelson
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