not sure what this ign 1 and 2 are - there is a wire to one end of the firewall resistor that goes to the coil, the wire on the other end of the resistor goes to the ign sw - if you have a 12V coil w/ internal resistance, just take the two wires off the firewall resistor [both of which go into the firewall if you have an original harness] and hook them together to bypass it - one side of the coil [either type] goes to the distributer, other side to the ign sw, but again on an original harness, both go into the harness
yer parts guys are screwy - resistors aren't measured in volts and it makes no difference to a resistor if it's 6v or 60v - their books should show that the 5-9 [235 or 283] uses a 12V coil w/ NO internal resistance, but they may not have that type of coil handy nowadays as everything went to the internal in the 60's or so
a newer style internal resistance coil will work on the truck [if you bypass the external one], but an original coil didn't have the internal resistance, so used the external ign resistor, which is why it's shown on your wiring diagram
the purpose of the original setup is that when you first engage the starter, the starter bypasses the ign resistor to give full juice to the coil, then once running, the coil only gets the resistance lowered current as Eric says so as to not burn points
Bill
