[TR] TR4 cut out under power

[Lee&John Howard]

Was having a nice drive along a good curvey road last evening when the
engine cut out.  Was very fortunate to be able to coast into a  pull-off.
Tried what I could on spot, and then was AAA'd home. Put on an new rotor.
This is negative ground car, so battery lead should tie to neg post on the
coil, right? Coil is OK, judging by ohm test. Installed new condenser.
Checked the gap. No spark.
What have I missed?
Most embarrassing. Your help greatly appreciated.
Thanks
John Howard