Frank,
Does sound nutty. A crossed wire is pretty unlikely though. More likely,
is a weak generator or a brake light circuit that is pulling too much
current and diminishing the peak of the waveform such that the tach isn't
driven. Check the voltage at the brake light switch (hot side) with and
without the brakes applied. Applying the brakes shouldn't reduce the
voltage appreciably. If it does, a weak short in a bulb socket might be
the culprit. If it doesn't, and you don't have an oscilloscope :-), have
the generator tested under load. Sound reasonable?
Good luck!
Jim Henderson
'69 Sprite MKIV HAN9U78817G
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