I bought a 12 volt with 2.5 ohm internal resistor for a 8n front mount. Fits just fine.  I thought I would have to take out the in-line resistor, so for the moment it is just bypassed with a jumper wire. Fire'd right up.When I take off the jumeper wire it bogs down and dies!!! Here's the real kicker. I can't find the "original ballast resistor" anywhere!!!! I've looked all over the tractor.... Yet from what I've read it shouldn't work without it. (I've searched the web for pics of the orignal ballast and there is no such animal on my 9N) By the way my dad got it for $500 from a masonic brother.The brother  got it for work done, long story short. It didn't run when we got it and the wiring is nothing like what's on the diagrams I've seen. At one point there's a push button  that comes from the alt p1 position to the ignition.?? What's that about?

5oes anyone know the total resistance for a 12 vot system ?  5 or 2..5 ohm?                                                             

                                Thanks, Justin ,East Texas