Posted by karl f on June 11, 2010 at 09:01:25 from (172.129.151.20):
In Reply to: alternator update posted by jdemaris on June 11, 2010 at 06:39:14:
jdemaris said: (quoted from post at 06:39:14 06/11/10) No, it does not have to be complicated. It becomes so when you don't have all the data/info.
What model of 10SI? What pulley ratio and RPM at testing? What regulator? Was a thorough bench test done?
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this is a freebie off of source unknown. believe it's stamped around 60amps. A new reman #7127-12 i tried behaved the same although it at least cut in at 3/4 throttle. I sure don't mind buying a new if needed since i have a core but when they behave the same I do not know which way to go.
The tester at work definitely spins faster than the tractor ever could with real world pulley sizes. it looks like at least a 4 inch drive pulley. The motor is inside the steel cabinet so i cannot see the specs. It is not variable speed and basically a volt meter with a charge light and 100s of harness adaptors. Made exclusively to decline warranty claims IMHO.
The tractor is a 400 farmall. I used a 3 inch pulley on both alternators originally. This time I used about a 2.5 inch. my previous posts were asking about pulley drive rpm and your post Jdemaris tells me the goal rpm of the alternator. the 400 drives the waterpump pulley about 1.5:1 to crank, and the waterpump in turn drives the alterator with a 4 inch pulley.
the new alternator paperwork said cut in rpm was around 250 so i don't know why it wouldn't work. I figured if the new and old acted almost the same to use the old...
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