You actually only need to jump one side. Here is the "deal."
When the Mopar breakerless system was first introduced, and for a few years, the box received power TO the box from TWO sources...........full 12V and also reduced power through 1/2 of the 4 pin ballast.
These are now known as a "5 pin" box and MUST have a 4 pin resistor
MOST boxes you will encounter are a more modern 4 pin box and do not need a 4 pin resistor.......the section feeding the box is simply dead ended
A 5 pin box MUST have a 4 pin resistor
A 4 pin box (or a conversion like yours) can have a 2 or 4 pin resistor, the "other half" is not used.
The 2 pin resistor is the same wiring which feeds the coil as the 4 pin. In other words once you forget the "other half" feeding the box, the half of the ballast which feeds the coil is THE SAME AS IT WAS ever since breaker points.
To sum this all up, you only need one jumper. "Which side?" Just put a light on the coil + and turn the key to "run." Unplug the old ballast. Hook your jumper to the end with the jumper across the two end terminals, hook the jumper to one, then the other wire on the opposite end. Whichever brings the coil+ wire "alive" is of course what you want. Tape/ "safe" off the remaining wires
