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Converting to 12 V from 6 V

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Joe in Houston

01-13-2003 07:43:20




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I have a 1955 MF TO35 that is running off a 12 V battery. There was never a conversion done on it so the generator does not keep the battery charged real well. I know there are conversion kits out there but is there really much more to it than swapping the generator for an alternator.? Not sure what type of alternator but a friend said that a streight GM alternator would work.?

I don't want to burn anything up or out so I wondered if anyone out here has done this by swapping the generator out.

Thanks

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Harold

01-25-2003 21:27:50




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 Re: Converting to 12 V from 6 V in reply to Joe in Houston, 01-13-2003 07:43:20  
Just read your question today, 1-25-03. I just got done changing my To-30 over to 12V. It has always been a pain as a 6V. Never started well. Not an engine problem, just a voltage problem. I have never had good luck with positive ground systems, 6 or 12. After 20 years of being pissed I finally converted it. It cost me about $200. I had to purchase the following. Rebuilt GM 67A internal regulator approximately 1977 or later. New 5ooA battery. New points and condenser, make sure you get a 12V GM codenser, Eclin # RR-175. 12V resister coil. The pully from the generator will fit perfictly over the shaft of the new alternator, but be sure to put the washer under the pully or the pully will force down on the alternator fins. You will have to move the generator bracket ahead slightly. This is acomplished by flattening out the rear of the bracket. Note, do not attempt this without heating the bracket red hot or the bracket will tear. Mount the atl on the bracket with only the one ear and hold it up to the engine with the belt on the pully. It helps to first take a small chisel and mark the tops of the bolt holes on the block, this will alow you to see where you want to prick punch the new holes in the bracket. Redrill the bracket in the proper place. Place the bracket in a vice and weld a new ear on it about one inch to the left of the forward hole. You will have to use a small pipe spacer to but against the back of the alt, but it is not a problen. This gives you a very secure mount. You have to run a #12 wire to the ampmeter to give it constant power. A jumper is required from the hot post of the alternator to the regulator. Looking at the back of the alt, the hot post at twelve o-clock, the jumper goes to the second spade clip to the right on the regulator, The first spade clip is then conected to the ignition side of the ignition switch. You will only see the alt charge alot at first start up, for it dosn't require a lot for just the coil. Additionaly, you will have to change over any light bulbs, for they will blow as soon as you turn the old ones on. Mine now starts like a champ. I got really tired of carrying around a jumper battery, especially when I was 1/2 a mile back in the woods. Good Luck If you chose the project. Wish I had taken the time to do it years ago. Only about 8 to 10 hours. Harold

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Ray,IN

01-13-2003 21:02:14




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 Re: Converting to 12 V from 6 V in reply to Joe in Houston, 01-13-2003 07:43:20  
Joe it is much simpler, easier, and cheaper to just buy a quality 6V tractor battery and perform proper maintainence on the system. A 6V system is just as good as a 12V system when everything is correct on both. A tip I learned is to reroute the ground cable to connect to a starter mounting bolt, eliminating about 6 bolt together connections on sheet metal, castings etc. These areas are poor conductors when dirt, rust, paint, and corrosion are present. Use a min. of 2ga cable, "0" ga is original size. The small 6ga cables used for 12V systems will not carry sufficient current. This way you won't need to spend the money for a 12V conversion either.

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John, IN

01-13-2003 17:56:13




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 Re: Converting to 12 V from 6 V in reply to Joe in Houston, 01-13-2003 07:43:20  
Go to the site below, should answer all your questions.

Link



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James, UK

01-13-2003 08:09:06




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 Re: Converting to 12 V from 6 V in reply to Joe in Houston, 01-13-2003 07:43:20  
I converted my TE20-85 to 12V - and it starts a lot better now than it ever used to. You will need to remove the voltage regulator box as the alternator won't need it, but otherwise the wiring is pretty straight forward.

I've heard a number of people here say that you will never burn out a 6V starter on 12V, but I still try not to run it for too long. In theory at least you are halving the current going thro the starter, so it should be OK . . . . .

If you don't want to get into the re-wiring, then put a 12V dynamo in and change the voltage regulator for a 12V one. OK, you will only get around 8 to 10Amps when charging as against a possible 60A off an alternator (depending on size and type), but if you aren't forever starting and stopping the engine, it won't make much difference.

I had to change it all on mine because the wiring was perished and a fire hazard with all that petrol about, and I had an alternator sitting around. A 12V dynamo conversion would look neater, and you wouldn't need to hunt for a different length belt to fit the alternator set-up.

Just remembered also that I get no charge on mine until I'm running at about half throttle - because even with a small pulley on the alternator, it only picks up enough speed to charge well up the rev range. You wouldn't get that problem/issue with a dynamo.

Just some thoughts.

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