8n charging system

good luck

jim

I was told by the place that rebuilt my genny that around 20 was the max.. and most likely 15-20 was closer to reality. I believe the older ones on the 9/2 N ( 1 wire jobs ) were rated for 11 amps or so.

Ok, on the top post, one will be field, and will be insulated by a fibre washer. The other post will be directly to the ground of the cast.. will not be insulated at all.. just a stud common to the outer casing.

The large stud on the rear is the output. Should be higher than 6 volts.. should be around 7 volts.. or so.. from there to ground. ( Your tractor was originally positive ground ).

Ok, att he regulator, there will be a batt terminal,, that is tied to the batter either at the hot stud on the solenoid.. or directly to the battery cable.. depends on the previous owners wiring.

There you will measure charging voltage.. should be higher than 6, to charge. The battery should measure 6 to 6.5 volts or so just sitting there... probably closer to charging voltage right at shutdown.. and closer to 6 if it has been sitting for a few days.

Some of these are approximates, as real measurements will be effected by the condition of the genny, and regulator, and how good the wires and connectios are, including condition of the battery, and whether or not someone has adjusted the regulator any.

Just curious.. why do you ask? is your charging system having a problem? or just for reference sake.

Soundguy

There is the possibility that your genny was rebuilt and hot rodded.. to get more current.. butstill doesn't explain why it is pegging your ammeter.

Double check your wiring.. and also.. what did the tractor finaly end up with ground wise... positive or negative ground.

Either will work... positive is better on the old 6v system though... most switch to negative for an alternator.. or just because they don't know any better.

Tractor electrics are fairly simple. The large stud on the back o fthe genny goes to the armature tab.. and the batt tab goes to the 'hot' wire on the battery.. ( be it neg or pos.. however it is wired ).

Many times the charging wire is run right to the hot side of the starter relay.

If this is an old loop style ammeter.. they are not the most accurate.. but at least give you an idea about what is going on.

Sounds liek you have something shorted.. or perhaps the polarity was changed and the genny was not hooked up correctly. Either way.. like I said.. 30 amps is alot of current... deffinately enough to burn up a battery if constant.. or at least melt wires.. or eventually burn the genny up..

do some checking, and get back to us.

Soundguy

You'll need to really trace the wires to see where they are goin, before you can do any in depth troubleshooting.

Also.. as Mr. Cox pointed out.. if the regulator contacts are stuck.. the regulator may be full fielded right now.. try disconnecting that field winding and see what happens.

Perhaps some of the guru's here will put in their 2 cents worth.

Soundguy

that is almost normal... Does it still go to 8/9 at full throttle? If so, then I'd say the VR is charging a bit high.. but Jim Cox would probably be better able to answer that one.

Soundguy