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
Nelson Riedel wrote:
>
> Helped a fellow club member fix an interesting problem with the MDS ignition
> in his '73 TR6. If this is old news --- sorry.
>
> The car ran great but wouldn't stop when the ignition was switched off. If
> he tapped his brakes, the engine would shut off. (He said that was good
> British logic; if you want it to stop, hit the brakes.) He said the MDS
> module was installed as per instructions, wires directly to 12 volts and
> ground and also a wire to the white ignition wire at fuse block. ( I assume
> there was also a wire or two to the coil, didn't think to check.)
>
> There was obviously some source of 12 volt power to the ignition wire with
> series resistance such that it was loaded down by the brake lights (also
> powered from the white wire --- but after the fuse so it is the green wire).
> Checked out Dan Master's schematic for the '73 and noted the Alternator
> Warning Lamp (IGN) from the alternator voltage sense circuit connects to
> the white wire. We pulled the lamp and everything worked properly (except
> the lamp). We installed a diode in series with the warning lamp and
> everything now works as it should.
>
> The problem may have been compounded by engine modifications such as three
> big Weber Carbs and I believe a shaved head & high lift cam. The idle was
> set faster than norm to smooth out the jumping at the curb. That may
> cause the alternator output voltage to be above normal for idle.
>
> Nelson Riedel
> Granville, OH
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