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$350 Cub
Show Parts for Model:

12 volt conversion

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Stan

12-07-2000 16:42:53
12.87.65.223



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Did Bob M's 12 volt conversion and I can't get the light to turn off to say the tractor is charging.

I've been told I need to get a smaller pulley for the alternator to make it spin faster to start the alternator charging. Checked the archives and found no mention of this. Any ideas.




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Steve/BB Custom Circuits

03-13-2002 14:58:58
148.108.1.57



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 Re: $350 Cub - 12 volt conversion in reply to Stan, 12-07-2000 16:42:53  
Stan,
Just stumbled on to your e-mail here with your electrical problem. I'm not farmiliar with Bob M's 12V conversion. Does he use a Delco 10SI alternator with this setup? If so, make sure the alternator is grounding well to the engine block, or whatever it's attached too. If the tractor was just painted, or rust is imvolved, lots of times the ground is lost. I always run an auxilary ground wire off the back of the alternator (especially if it's a Delco-because of the loose pivot bolt that mount them) to a good clean chassis or engine ground. Sometime's the simplest thing like that can fix an electrical problem that can make you cuckoo. Hope this helps....

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Bill

12-08-2000 09:45:27
206.150.221.80



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 Re: $350 Cub - 12 volt conversion in reply to Stan, 12-07-2000 16:42:53  
Don't know about Bob' conv. setup, but I did a M IHC for a fellow a couple of years ago. Your alt sould have a regalator in it. Did you take off the old reg.that went with the generater? Bill



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Tom W.

12-07-2000 19:03:20
166.94.57.228



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 Re: $350 Cub - 12 volt conversion in reply to Stan, 12-07-2000 16:42:53  
I just did a 12 volt conversion on an H according to Bobs plan and it worked fine one time. When I came back to the tractor a few days later, the battery was dead. When I charged it and started, the alt. was not charging. I bought this at an auto parts store rebuilt. They won;t take back electrical parts so I was stuck. I then went to a junk yard and got a used Alt. and It has been working fine ever since. So you may have a bad alt. Most auto parts stores can check to see If the Alt. is OK. If you get a bad one at the junk yard they will usually exchange it.

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RayP

12-07-2000 17:07:43
216.46.197.215



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 Re: $350 Cub - 12 volt conversion in reply to Stan, 12-07-2000 16:42:53  
Have you tried revving up the engine? Just completed a 12v conversion on a Farmall 200, and it worked just fine, but you may have to rev up the engine to get things "started." Learned this with a portable charger I made with a 5hp derelect tiller motor, a few years back. Good luck!



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Stan

12-07-2000 17:19:38
12.87.65.223



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 Re: Re: $350 Cub - 12 volt conversion in reply to RayP, 12-07-2000 17:07:43  
Ray

Reved it up as far as the throttle would go still nothing.

In all fairness this tractor still need a lot of work. Could it be possible it just isn't running fast enough to start the alternator. My SA is a 6 volt but thats all I have to compare it to and it seems a little slower than that one.



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Bob M

12-07-2000 16:53:01
172.153.92.165



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 Re: $350 Cub - 12 volt conversion in reply to Stan, 12-07-2000 16:42:53  
Stan - You may indeed need to install a smaller pulley on the alternator. It needs to be "spun up" to a speed considerably above it's slow charging speed to get it to turn on the regulator when first started - a smaller pulley will help this happen.

Also what kind of warning lamp bulb are you using? If it is a small wattage one, try substituting a #194 instrument panel/side marker lamp bulb and see if the problem disappears. Reason: The alternator needs a least 0.2 amps of current flow in the warning light circuit to turn on the regulator.

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ltf in nc

12-07-2000 18:26:46
206.228.213.194



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 Re: Re: $350 Cub - 12 volt conversion in reply to Bob M, 12-07-2000 16:53:01  
Bob, what do you think about Stan jumping 12 volts to the exciter terminal with the tractor running? It should start charging if it is going to without revving the engine very high. I pull the cover off the side terminal on the one wire alternators and do this when they won't charge.



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Stan

12-07-2000 17:11:17
12.87.65.223



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 Re: Re: $350 Cub - 12 volt conversion in reply to Bob M, 12-07-2000 16:53:01  
Bob

Thanks for the quick return.

The light I used was the #1815 bulb and holder you suggested from Radio Shack. Would the side marker bulb be different ?

If I do need a smaller pulley how much smaller. The one on now is the standard 2-1/2" GM pulley



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Bob M

12-08-2000 06:13:51
172.133.212.52



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 Re: Re: Re: $350 Cub - 12 volt conversion in reply to Stan, 12-07-2000 17:11:17  
Stan - The #1815 lamp you're using fine - no different electrically than a #194. You might try ltf's suggestion to jumper the #1 terminal direct to the alternator output terminal with the motor running at speed. (Just remember to take the jumper back off when you shutdown - otherwise the battery will discharge back thru the alternator). Regarding the pulley, if you can find one smaller than you've got, use it. Seems to me 2" is about the smallest. BTW: Don't worry about the pulley being TOO small - there's no danger of overspeeding on your setup.

If the above gives no results, take the alternator to a parts store and have them put it on their test stand. If it works OK on the test stand, that says you've got a wiring error someplace.

Good luck! Bob M

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Stan

12-08-2000 14:27:31
12.87.64.235



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 Re: Re: Re: Re: $350 Cub - 12 volt conversion in reply to Bob M, 12-08-2000 06:13:51  
Thanks to all who posted.

The Alternator I used was from a junk yard. Had it tested at NAPA and they said it was fine. That doesn't mean it still is. I will try your suggestion and post results.

As to the jumper wire. Would that be a wire running from #1 on the alternator to the BAT terminal on the alternator ? and if so what size wire ?



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Bob M

12-08-2000 19:12:05
172.128.174.121



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 Re: Re: Re: Re: Re: $350 Cub - 12 volt conversion in reply to Stan, 12-08-2000 14:27:31  
Yes Stan - jumper the #1 terminal to the BAT terminal. Any size wire is OK for the jumper - can be small as #18 or #22.

Let us know what you find.... Bob M



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T_Bone

12-07-2000 18:30:35
207.254.53.35



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 Re: Re: Re: $350 Cub - 12 volt conversion in reply to Stan, 12-07-2000 17:11:17  
Hi Stan , an alternator maxmium out put is at 2000rpm but will output less amps at a lower rpm. There is a cut off of amps and I think that was 650rpm at the alternator.

So if your engine is idleing at 450rpm @ a 6" diameter driven pulley then your alt. rpm is approx. 1087rpm enough for a small 7 to 10amp flow.

T_Bone



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