[T3] hot start difficulty

[Dan Badeer]

I know this has been covered before, but I can't seem to find it.

New engine (175 miles)
rebuilt starter
starter and battery wiring is very good
new german voltage regulator
runs great
I get a click sometimes when trying to start, with nothing cranking;
when this happens it usually starts on the 2nd try
battery is fully charged and fairly new (I keep a trickle charger on it)
no flat spot or hesitation while driving; very smooth through the gears
will usually fire on first crank
It wouldn't start today after a 40 minute drive at about 60 mph.  It
cranked just fine.....  After cool down, it fired right off, as usual.

Thanks in advance,
Dan
65 SB