[Ford-ferguson] 2n not running

[Chris Britton]

>Follow up: I do have a spark, but it isn't strong. I checked the voltage
>at the coil, and it is only about 2.5 volts. And it is only about 3
>volts at the resistor on the instrument. It appears that I have high
>resistance between the battery and the block, so I am going to remove
>the ground strap and clean everything up. Does anyone have a value for
>what the resister (a brand new one) should be? I will be away the rest
>of the week, so the tractor is sitting with a couple of ounces of MMO in
>each cylinder and the plugs finger tight (to keep out any moisture and
>critters).

That bad ground is causing you lots of problems.  Make sure the ground braid
goes to a good clean ground.  On my NAA I also ran seperate 'feeder' grounds
from that point ( steering pedestal ) to the block and battery tray.  Any
difference in voltage because of resistive  ground potential is going to
have a bad impact on sparks, and starter performance.

The 2n used a ballast resistor that changed values with temperature.. it was
a low value at start, to let max volts get to the coil.. as it warmed up the
resistance went up ( thermal coeficient ) and reduced voltage at the coil to
protect it.

I believe the ford number is A8NN12250B  ( the a8nn12250a is the 8n front
mount resistor, and electrically will be identical. .though the mounting
scheme may not be.

Soundguy