sc light circuit

caseydog

Member
I know that on the electric circuit I need to put a resistor, where does it need to go and what ohm rating should it have?
thanks for all answers
 
The SC does not have a resistance position in the light switch as earlier or inexpensive tractors would. It uses a adj 3 brush generator and a 2 stage or 2 "rate" regulator, as Case calls it. After starting, or when the battery is partially discharged, or under load, as with headlamp usage it charges around 12 amps, as the battery approaches full charge it lowers it to around 3 amps which is more than enough to prevent overcharging. That charge rate of 12 amps is factory set. You can, however change it. The 3rd brush is adjustable, and by moving it in the direction of armature rotation, you will increase the charging rate. You have to have load testing equipment to properly adjust this. I suppose you should verify the generator is the right one for the SC, by part# is the best way. Your cheaper charging units need a resistance to prevent over charging. They just have a cut out relay, which turns the generator off and on. If you were working the tractor all day and charging wide open you will destroy the battery, hence the resistor in the circuit when the headlamps are not on.
 

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