Help with IH super h

1) With it disconnected measure the ohms across it which should be somewhere around 1.5 to 1.85 ohms i.e. a continuous circuit HOWEVER if it reads an open circuit near infinity ohms its bad and open therefore NOOOOO voltage to the coil to produce a spark.

2) Turn the ignition on and with the distributors points closed measure the voltage with respect to ground at the resistors high input (from ignition switch) n output (to coil) terminals. It should be around 12 on its input but 6 on its output if all is well. HOWEVER if theres no voltage at all on the output (same as voltage to coil) then the resistor is bad n burned open.

Assuming youre using a 6 volt coil which is why the ballast is needed its ohms value ought to be near the same as the coils prinmary winding which is somewhere around 1.25 to under 2 ohms. They must be power rated round 25 watts or more or else they would burn up quickly. It may help to dissipate heat if theres a good solid tight clean mechanical surface connection on the ballast mount to the tractors iron.

Maybe you got the wrong ohms value or inadequate power rated ballast???

John T

• Hobby farm

• h