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12 volt conversion

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Brent Salyers

04-03-2002 15:46:23




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I recently had problems with my 1951 Harry Fergerson 6v system. Before I purchased it someone had installed a 12v battery(enough said). I went to a tractor supply and they talked me into buying a single wire 12volt alternator to replace my 6 volt system. I was told to run a wire from the one connection on the alternator to the hot side of the switch on the tractor. I have done this and connected the coil wire to this same terminal. It still does not charge. The supply shop said I had to run the tractor at a high rpm to get the (alt) to kick in then it should run till I shut the tractor off. If anyone has ever used these one wire alt I would appreciate the help. Thanks Brent.

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Bill

04-26-2002 12:20:03




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 Re: 12 volt conversion in reply to Brent Salyers, 04-03-2002 15:46:23  
Have done this conversion MANY times. Run the one wire from the alternator to the battery + post. Through a amp meter if you like. Sometimes after starting you may have to rev it up to get it to go. Small pulleys are a help. One extra thing I do to increase ignition point life is to install an ingition ballast resister from a 70's Chrysler product with points inline with the + power supply to the ignition coil. Cuts down the 12 volts to the points. I just walk into the parts store & ask for an ingnition ballast resister from a 72 Dodge pich-up. Will be a White ceramic bar with 2 spade connections.

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Red Dave

04-04-2002 07:44:08




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 Re: 12 volt conversion in reply to Brent Salyers, 04-03-2002 15:46:23  
1 wire alternators need to run pretty high RPM to get them started, just like they told you at the shop. This is no problem on a car or truck engine, but it is a problem on low RPM tractor engines.
You may want to try getting the smallest pulley you can find to put on the alternator, the smaller, the better. It probably will be neccesary to run the RPM's to full throttle to get charging started, even with the small pulley. After it starts, it should keep charging throughout the engine's RPM range, if everything is working right otherwise.

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Henry4020

01-02-2007 15:00:54




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 Re: Re: 12 volt conversion in reply to Red Dave, 04-04-2002 07:44:08  
Can anyone post a wiring diagram for the 12 volt conversion. Thanks



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Clooney

04-03-2002 18:11:30




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 Re: 12 volt conversion in reply to Brent Salyers, 04-03-2002 15:46:23  
Brent, did you buy an actual 1 wire alternator? Or a standard Delco 10-SI the just gets 1 battery wire hooked to it? ~Did it have a plastic cap over the two little -- terminals?
~If it is an actual 1 wire alternator, it should have a plastic cover over those terminals & shouldn't need the hot wire from the ign switch to the #1 terminal.
~If it is an actual 1 wire Delco alternator you might have to jump 12 volts to the # 1 terminal with the alternator running to energize it to get it to start charging, then it should charge by itself without that jumper wire until it sits for an extended period of time.
~Now if it is a 3 wire Delco 10-SI, it will need the big battery post on the back hooked to the tractor ammeter or battery, the # 1 terminal hooked to the ignition switch with a 10 ohm resistor in that wire, & the #2 alternator terminal hooked to the big battery post on the alternator.
~If you know for a fact that it is a 1 wire alternator, & you have the big battery post on the alternator hooked to the battery or ammeter, & you have run it with 12 volts applied to the #1 terminal while running at fast idle, you either have a bad alternator or the big wire hooked to the back of the alternator doesn't get to the battery (that wire should have 12 volts when the engine is off)

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