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the alternator, still not right?

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Andrew Z

03-14-2006 10:08:42

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ok, I hooked up the wiring just like Bob"s diagram and used a 10watt 10ohm resistor from radio shack and still nothing!! the only thing that happens is that the resistor gets hot, thats it no charging.
Thanks Andrew

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dave2pa

03-14-2006 14:44:28

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Re: the alternator, still not right? in reply to Andrew Z , 03-14-2006 10:08:42

I dont know if this will help or not ,,but i changed my 350 U over to 12 volt ,,a local alt. shop built a GM alternator for me .I have a wire on a spring loaded toggle switch I use to start it charging ,the one terminal just needs a jolt to start the charging.My main wire is on the stud and this one from the switch goes to one of the 2 that plug in the side.Works great just bump the switch when you start the Tractor.Otherwise you have to rev it to very high rpm to get it to start charge. Dave

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Janicholson

03-14-2006 11:57:35

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Re: the alternator Search Hitachi in reply to Andrew Z , 03-14-2006 10:08:42

From the archives (here)
I just finished doing this on my 1951 H with a lot of help from a couple of guys here on the forum. My alternator has the identity of each spade cast into the case. If you are following Bob Melville's wiring diagrams here on this site S is the same as the 2 terminal shown for the Delco 10SI alternator in his diagram. I just looked at my tractor and if you position the alternator with the two pivot lugs down the S terminal is the higher one and runs in a horizontal plane. Hope this helps. If you would provide your email address I have quite a bit of information I can provide to assist you in this conversion if desired. A really neat conversion for the H.

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Bryan Phillips

11-22-2006 16:48:07

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Re: the alternator Search Hitachi in reply to Janicholson, 03-14-2006 11:57:35

I would very much enjoy the info you have on the alternator conversion. My machinist stated he cannot get the 10si to fit. I am willing to try anything! Thanks!

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Nat 2

03-14-2006 10:52:31

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Re: the alternator, still not right? in reply to Andrew Z , 03-14-2006 10:08:42

There's no magic involved, so one of two things is going on:

1. Your alternator is no good.

2. You don't have it wired up "just like Bob's diagram."

Please don't take offense to #2. It's called "rookie mistakes." If you're not experienced at wiring a tractor, then you will likely make a mistake in the wiring somewhere. You will then spend hours and hours going over the wiring, saying "Yep that's right," without even noticing that bad connection or wire in the wrong place. Happens to all of us, and a second pair of eyes usually catches the problem.

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John T

03-14-2006 10:27:38

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Re: the alternator, still not right? in reply to Andrew Z , 03-14-2006 10:08:42

Andrew, Is this for wiring up a GM 10 SI 3 wire alternator (used like a one wire)??? Are you sure the 10 ohm resistor is on the correct (lil No 1R) side alternator terminal??? Its the excitation circuit often fed off the Ignition switches IGN termninal which is hot ONLY when the ignition is switched ON. In the rare event the tractor still runs even when the ignition is turned oFF, I add a diode in that circuit also. The other lil side No. 2 alternator terminal voltage sensor circuit jumps/wires to the big main output stud on the alternators rear. The alternators main output stud wires up to the load (NOT to battery/starter) side of the ammeter.

Make sure you have the lil 1 and 2 side terminals wired to the correct location and youre at NEGATIVE ground as required by the GM alternator.

John T

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Andrew Z

03-14-2006 10:35:39

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Re: the alternator, still not right? in reply to John T, 03-14-2006 10:27:38

Its a Hitachi alternator, and I got it wired up just like The alternator for a Super M.

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Andrew Z

03-14-2006 16:36:59

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Re: the alternator, still not right? in reply to Nat 2, 03-14-2006 13:43:55

Thanks Nat, I try wiring it again, hopefully one of these times I"ll get it. Thanks everyone!
Andrew

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John T

03-14-2006 13:19:59

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Re: the alternator, still not right? in reply to Andrew Z , 03-14-2006 10:35:39

Andrew, if its a "one wire" alternator all bets are off and DISREGARD all I said above. On a true "one wire" alternator its big main output stud wires to the load (NOT to battery/starter) side of the ammeter with 10 gauge wire. There would be NO 10 ohm resistor in the output of a one wire alternator (if thats what the Hitachi is???). Its most likey a Negative ground alternator, so be sure you changed the battery to Negative ground. If so the ammeter leads need to be reversed or else it will read bass ackwards plus the coil leads need reversed so - goes to the distributor and + receives voltage from the switch.

I have no idea how that Mitsubishi would wire if its OTHER THEN a one wire alternator so dont bet your life on what I just posted. The 10 ohm resistor is used in the excitation circuit on the GM 10 SI alternators but NOT on one wire alternators, they are internally self excited.

John T

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