JD 820 - 6 volt alternator on a 12 volt tractor?

[jcalla]

I had an old JD lawnmower that used a generator similar to the one shown. I rewired it myself. It was also the starter and after the tractor started would switch over to generating DC current. Worked great for 18 years until hydrostatic trans went, then I traded it in for my 455.

JPC

 

[glenhenshaw]

Does anybody know how fast the engine should spin at idle? If I knew that I could figure out how fast the alt is going (and the right size for the pulley).

And does it hurt anything to spin the alt below 400 RPM?

 

[Soundguy]

nope.. just won't charge...

soundguy

 

[RickB]

Does anybody know how fast the engine should spin at idle?

Off the cuff, no less than 800 ERPM.

 

[jd110]

You might find that the alternator will work better after you get the new indicator bulb. With the broken bulb, the energizer circuit is open and it has to self-energize. That is the reason you need to rev engine to charge.

 

[Soundguy]

once it excites, it should stay charging down to 400 rpm though.

in any case.. 3 wire setup is best IMHO..

soundguy