replaced the military 24V coil with an Accel 8140 12V coil. The 24V coil
series resistor of 4.4 Ohms (spec at 4.5) reduces the voltage to the 12V coil
down to 6V due to it's lower resistance and thus higher current drain, the
Accel coil requires 9V for optimal output voltage (although this is much
higher then required it's nice to have a little extra high voltage going to
the plugs :) so i found some crome wire at an electric surplus store
wound on a 20 Ohm resistor, cut off 2.4 Ohms worth and replaced the stock
wire inside the preresistance box. Now the coil is getting 9 Volts, but
the resistore is now dissipating 95 Watts vs 64 Watts for the stock setup.
The wire for the resistor is well within spec (i.e. it's far from glowing)
and the resistor box is mounted to the firewall and doesn't seem to be any
hotter then it was with the stock setup (i.e. it's hot but you can't fry
an egg (or finger)).
In addition the starter preresistor bypass wire (on the preresistor there
are 3 wires (COIL+, START+, BATT+), one goes to the starter button such that
when you press the starter button the coil is connected to the battery (i.e.
the preresistor is bypassed). This was done to increase voltage into the
coil to compensate for the decrease in battery voltage while the starter
is running, this shouldn't be needed with the modern coils as they run at
a much higher voltage out.