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Hey clooney

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Pete Ellis

11-20-2000 18:35:39




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Further to your answer to the Positive ground A.

I put a 12 V battery in my B, now I want to charge it. Are you saying I can use a 12 V gen and get either pos or neg from it. can I change to Positive ground or will this destroy the starter. I wanted to put a gm generator on it because I have several.

thanks for this and all the free advice you have posted in the past.




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Pete Ellis

11-21-2000 17:34:13




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 Re: Hey clooney in reply to Pete Ellis, 11-20-2000 18:35:39  
Thanks for all the advice. I have mag so only was concerned about rotation of starter., can get around all the bulb stuff. already running 12 volt lites. just did not know about the generator polarity. Thanks clooney and john



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John T

11-21-2000 06:13:03




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 Re: Hey clooney in reply to Pete Ellis, 11-20-2000 18:35:39  
Pete, Clooney there is right, and just to add a little theory, because I think if you understand HOW things work you can fix them without any wiring diagrams. A generator does not know what voltage its to produce, thats increased by incresing the field current (which a voltage regulator regulates) or turning it faster and faster. Also, a generator can produce a voltage polarity comparable to the polarity of the battery, due to the direction of current flow through its field windings, and is why you can simply polarize the VR to the new pos or neg grnd configuration and make her work either way. THe series DC starter motor will turn the same way regardless of polarity, and since power in a DC circuit is Volts times Amps, at 12 volts, it actually draws half the current it would at 6 volts, and heat producing current is what harms insulation anyway, so it will be fine a long time at 12 volts unless you let it run long loaded periods at the higher rpm than its accustomed to. I suggest you put her at + grnd, re polarize the VR after its all connected (it has to be a 12 volt VR of course), that way you dont have to change the coil and ammeter wiring etc, assuming its still for + grnd. Let us know. Ol John T in Indiana

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G Taylor

11-21-2000 10:24:24




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 Re: Re: Hey clooney in reply to John T, 11-21-2000 06:13:03  
The DC motor runs the same way with switched polarity as both the field & armature windings get swapped at the same time. Their relative relationship hasn't changed. In a resistive circuit if the reistance dosn't increase due to higher heat, doubling the applied voltage also doubles the current.Results are four times the "power".Same goes for hot water tanks with 240 elments wired to 120V. The element will produce onlt 1/4 of it's rated power. A six volt starter with 12V applied would likely draw more current than when on six volts. Depends on load,is the magnetic circuit saturated and what back emf the motor is generating. Would be interesting to actually test. If the "B" has a mag then no ignition changes. If the 12V is being as crutch to overcome starting problems or to power better halogen 12V lamps than polartiy can stay positive ground. If the 12V upgrade is to run a radio,equipment monitor etc than negative ground will be required. A second, higher resistance ballast resistor will be required or a 12V coil with the origional ballast.

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clooney

11-20-2000 19:39:31




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 Re: Hey clooney in reply to Pete Ellis, 11-20-2000 18:35:39  
Pete, you can put a 12V generator on it or just put a 12v regulator on your 6v generator and get 12 volts from it, with a 6v generator with a 12v regulator on it you will have to keep the RPMs up a little more for it to charge but it will work good. Don't worry about the starter as it will work fine (the wiring in a 6v starter is actually bigger than on a 12v starter. Because a tractor generator uses electro-magnets (wire wound) & not permanent magnets it can be polarized to charge in either positive or negative polarity..... About your GM generator, is it a generator or an alternator? If you use a generator you can leave it positive ground, if you want to use an alternator you will have to convert it to negative ground along with changing the polarity of the ignition coil & swap the wires on the ammeter. Let me know exactly what you have & what you want to do & I will explain what has to be done to work correctly.

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henry

11-21-2000 06:33:17




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 Re: Re: Hey clooney in reply to clooney, 11-20-2000 19:39:31  
IF I PUT AN 8 VOLT BATTERY IN A 50 B WILL THE GENERATOR STILL CHARGE IT? OR DO I PUT AN 8 VOLT REGULATOR ON IT. OR SHOULD I JUST PUT 12V LIGHTS AND 12V REGULATOR ONIT? THANKS.



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clooney

11-21-2000 07:43:10




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 Re: Re: Re: Hey clooney in reply to henry, 11-21-2000 06:33:17  
Henry,you can use your 6volt regulator but will have to set the regulator charging voltage to 9-9.5 volts or the battey won't charge. Depending on the regulator you have there will be an adjustment screw or you will have to bend the tang that the spring attaches to for the field points. The cut-out voltage will have to be raised slightly to 8.5 volts by either adjusting the screw or bending the spring tab (the cut-out has the big wire wound around it).. I don't know if there is such a thing as an 8volt regulator (Check around though as someone might offer one).. If you go the full route & put a 12volt battery & regulator on it you will have to change the lights & put a ballast resistor in the wire from the ignition S/W to the coil. Even with the 8volt battery & 9volt charge rate you will have the points fail sooner than if left at 6 volts (7volts charging). If the battery cables, wireing & connections are in good shape a heavy duty (high CCA) 6volt battery should work good.

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