> On the
> negative side of
> the coil, and at the distributor, it reads between 7 & 8 volts and the
> reading sometimes "jumps to" 11 or 12 volts.
Hmm, have you checked your point gap or dwell ? That seems a little high to
me. Could be a bad connection inside the dizzy too, maybe a wire that is
broken internally. Could the ground wire for your point plate be missing or
open ?
> With the key in the On
> position, but the car NOT running, I get the same 12.5 on the + side and
> less then 1 (actually 0.25) on the negative side.
My apologies if this was covered, Bob ... a 75 TR6 should have a ballast
resistor built into the wiring harness. This measurement means yours has
been removed. Do you know which Lucas Sports coil you have ? The proper
coil for a 75 TR6 requires the external ballast ... if someone sold you the
proper coil then you may be overheating the points and/or coil due to lack
of a ballast.
Easiest test for a bad coil, IMO, is to substitute with a known good one.
Randall
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