Hello, checked and read a bunch of threads and still not sure.
For the fun of it, I converted my '78 to the non-US points distributor (19100-61080). The stock coil is 90919-02083 and says 12V-R, but I believe it also says use with resistor. The primary resistance is 1.8 ohms. There has never been a visible external resistor but the wiring diagram shows an inline resistor.
There are two B/Y wires (one fat, one thin) that connected to the coil/igniter combo. Connected the points distributor to the coil (-) and the coil (+) to the fat B/Y wire (which is how it connected originally).
Running the engine:
My question: Do I actually need an external ballast resistor for this coil or can I run it as is?
I measured my son's '71 points setup, which does not have a ballast resistor, and his values are:
Oh, and question #2/#3.
My starter has the B/W ballast resistor bypass wire but where does it end up near the coil? Is it the same B/Y wire that attaches to coil (+) and receives 14V only when cranking?
For the fun of it, I converted my '78 to the non-US points distributor (19100-61080). The stock coil is 90919-02083 and says 12V-R, but I believe it also says use with resistor. The primary resistance is 1.8 ohms. There has never been a visible external resistor but the wiring diagram shows an inline resistor.
There are two B/Y wires (one fat, one thin) that connected to the coil/igniter combo. Connected the points distributor to the coil (-) and the coil (+) to the fat B/Y wire (which is how it connected originally).
Running the engine:
- battery voltage is 14V
- 12V on the two B/Y wires
- 12V on the coil (+)
- 9V on the coil (-)
My question: Do I actually need an external ballast resistor for this coil or can I run it as is?
I measured my son's '71 points setup, which does not have a ballast resistor, and his values are:
- Primary resistance: 3 ohms
- When running, full battery voltage to coil (+)
- When running, 7V to coil (-)
Oh, and question #2/#3.
My starter has the B/W ballast resistor bypass wire but where does it end up near the coil? Is it the same B/Y wire that attaches to coil (+) and receives 14V only when cranking?