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Harry Ferguson Tractors Discussion Forum
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Genetator to alternator conversion

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RegoR

02-07-2006 17:46:55




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Has anyone done this conversion on a 12V TO-35 gas? I seem to be having trouble finding info on this. Appreciate any help.
RogeR




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Bob Blach

02-08-2006 12:47:14




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 Re: Genetator to alternator conversion in reply to RegoR, 02-07-2006 17:46:55  
I also have a 35 I went to the auto parts store and got a one wire GM alt. and a 12 volt coil.so the change over was real simple. mine was also a postive ground so just check things out, also change the condenser. mine has been in service for about 2 years and now starts great and I have added lights witch help. lookin to sell one of two different tractors that I have the TO 35 or a Ford 4000 Industrial diesel. they are in good working condition not restored or cherry. with box scraper and 5ft. disc. what can i get for one or the other

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RegoR

02-08-2006 13:56:00




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 Re: Genetator to alternator conversion in reply to Bob Blach, 02-08-2006 12:47:14  
Hi Bob B.
Thanks for the info.
I take it you converted form 6V to 12V, correct?
That was the reason to change the condenser, right?
Roger

Don't forget to place your "For Sale" items in the Classified Ads on this site.



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Bob Weeks

02-08-2006 07:11:00




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 Re: Genetator to alternator conversion in reply to RegoR, 02-07-2006 17:46:55  
I recently purchased a TO35 that had a 12V conversion already done but the alternator wasn't charging. After a lot of research and having the alt. checked, I rewired the whole thing and figured out how to get it to charge. I would be glad to answer any questions. Incidentally, my 1955 TO35 was originally a 12 Volt system with a generator and positive ground. Actually, the conversion is quite simple once you know how to solve the little idiosyncracies that each conversion has to offer. Wiring the alternator with a one wire or a two wire set up is the tricky part. If the alt. won't start charging at start-up then you have to figure out a way to "excite" it, and there are a couple of tricks to that. Then you have the problem of back draining the battery when the tractor is turned off. That requires a 1 amp, 50 volt diode wired into the wire that goes from the switch to the alternator. As I said earlier, leave a question or two on the forum and I'll try to answer.

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RegoR

02-08-2006 08:09:56




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 Re: Genetator to alternator conversion in reply to Bob Weeks, 02-08-2006 07:11:00  
Hi Bob;
Thanks for the reply and the offer to answer questions.
I'll start off by asking what brand, type & model altrnator do you have? And how did you 'excite' it to charge at low RPMs?
Any chance we can continue this instrucion process via email?
Thanks,
Roger



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Bob Weeks

02-08-2006 18:49:18




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 Re: Genetator to alternator conversion in reply to RegoR, 02-08-2006 08:09:56  
First,let me say that if you type in a search in the forum you will get a lot of information. Just type in "12 volt conversion" and you will get about 100 references to the topic. Now, to answer your question about excicing your alternator. I found that using a short wire stuck into the p1 alternator terminal and used to momentarily touch the Batt.(big) terminal of the alternator, after the tractor is running, will start the alt. charging. I also discovered that increasing the engine RPM's to about 2/3 throttle will also get it charging. As to the brand of alternator, mine is a three wire GM type out of a 76 chevy pickup.I think that is how AUTOZONE tested it since there was no model # or other identification.

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RegoR

02-09-2006 06:12:06




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 Re: Genetator to alternator conversion in reply to Bob Weeks, 02-08-2006 18:49:18  
Bob;
Thanks for the info.
I used the search feature before initially posting, but I only found info relating to TO-30s and some even specified, "TO-30 ONLY". So that led me to think I should seek info on the TO-35, which is what I have.
Back to the questions:
Do you touch the P1 to BAT jumper each time you start the tractor?
You mentioned there are a couple of tricks to excite the Alt. What other way is there?
Thanks again,
Roger

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Bob Weeks

02-11-2006 11:50:51




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 Re: Genetator to alternator conversion in reply to RegoR, 02-09-2006 06:12:06  
The two ways to excite the alt. are 1. momentarily touch the short jumper from the p1 to the Bat terminal after the tractor is running. If the alt starts to charge you will notice a slight decrease in rpm's. The other way to get it charging is simply to rev the engine to about 3/4 throttle. This second metnod may not work if the alternator doesn't reach about 1200 rpm's. That will depend upon the pulley sizes (fly wheel and alt. pulleys. Good luck.

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dfitch

02-08-2006 03:58:46




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 Re: Genetator to alternator conversion in reply to RegoR, 02-07-2006 17:46:55  
I just converted a TO-30 and found the following link to be very helpful

Link

I can't take credit for putting it together but someone did a very good job. If the above link doesn't work send me an email and I'll make sure you get it. There are several links in there one of them even tells you what car you should specify to get the right alternator from the auto part store. Don't know if a 35 is the same as a 30 but I was able to modify and reuse the old generator mounting brackets to mount the new alternator. I took several pictures while I was making the bracket and will be glad to share them. Either send me an email or repost here. My email is ddfitch at htc dot net

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Barry from Stirling

02-08-2006 13:44:27




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 Re: Genetator to alternator conversion in reply to dfitch, 02-08-2006 03:58:46  
Afternoon dfitch
That web-link is from a gent by the name of Jim Wallace, he often posts in this forum under Jim W. He lives close to Ottawa in Ontario. I have met him, great guy



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dfitch

02-08-2006 13:50:46




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 Re: Genetator to alternator conversion in reply to Barry from Stirling, 02-08-2006 13:44:27  
I need to thank him. He sure did a good job
Not knowing an awful lot about this stuff I
couldn't have converted without the information
he provided. It has everything you need to do it



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RegoR

02-08-2006 14:04:07




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 Re: Genetator to alternator conversion in reply to dfitch, 02-08-2006 13:50:46  
I need to follow this up with a huge THANK YOU to you, dfitch, for all the info you've provided me on this topic. Your thoughtful and detailed descriptions are invaluable. Much obliged.
You da man! :-)
Roger



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