The first thing I'd do is see if there's a spark at the coil HT wire,
thus eliminating any prob in the dizzy cap and rotor. If there's no
spark, I'd set my voltmeter to, say, 50 volt scale, hook it between the
coil + side and ground, then have someone crank the engine while I
watched the voltmeter. If the amp is triggering the coil the needle
should bounce. If it doesn't i'd first clean every connection in the
ignition lo-tension ckt and try again. After that it's sort of a wire
continuity check and/or substitution method of trouble shooting.
FWIW,
CR
Tom Bott wrote:
> Good Day MG Docs,
>
> Patient: 1980 MGB LE all original with electronic ignition including
external
> amplifier (mounted on inner fender below coil).
>
> Symptoms: no spark at plugs.
>
> Diagnostics: I am getting 12+ volts out of the coil. But I also
noticed that
> when I ground the voltmeter to the engine and put the positive probe
on both
> positive and negative sides of coil, I am still getting 12+ volts. Is it
> normal to get voltage from both sides of coil? Or is something
plugged into
> the wrong side?
>
> Also, what type of volt reading should I be getting out of the
amplifier to
> the distributor? And does anyone know of a simple test for the
distributor?
>
> As always, keep 'em runnin!
>
> Thanks, Tom
/// or try http://www.team.net/cgi-bin/majorcool
/// Archives at http://www.team.net/archive
|