the first question is if you have TF trucks, why 6V? 59 is 12V
the notice on the coil means it has internal resistance, so should NOT be used w/ an external - you could go back and ask for one w/ NO internal resistor - or just take the external resistor out of the circuit by hooking the 2 wires together that normally go to the firewall resistor
6v and 12v use the same dist
internally regulated 6v alternator? need to hook some wires together at the firewall regulator, but can't recall which right now, will see if I can find my notes, but you need to clarify if this is not your TF truck
Bill