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Discussion Forum

12 volt conversion

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03-09-2003 19:04:28

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I have a 600 ford, I recently converted it to a 12v system.I used a 1 wire delco alt. and ran the wire
from it to the hot side of the solenoid along with
the distibutor wire.My problem is when I take the pos. battery cable off while its running it goes
dead.What is going wrong??

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Tim Dalrymple

03-10-2003 13:27:06

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 Re: 12 volt conversion in reply to BC, 03-09-2003 19:04:28  
The one wire alternators do need more RPM's to charge. They are usually used on boats with run at higher RPM's. You may have problems with this alternator charging at low RPM's. You can fix this problem by changing the pulley to a smaller size which will increase how fast the alternator actually spins.

I think that the alternator should charge without the battery. I think that there is another problem. The charging system of a tractor is the same as a car, a tractor just runs at lower RPM's and requires less amperage. The one wire alternator should be self-exciting.

A standard alternator such as a DELCO 10SI has to have a diode or an small lamp as a load to excite the field and begin charging. Make sure that you really do have a one wire alternator. The standard three wire alternators have one lug type terminal located on the rear of the alternator and two male spade type terminals located toward the rear, but on the side.

The best method of checking the charging system is with an ammeter. If you do not have one, check the voltage of the battery while the tractor is running and you are applying some type of load on the battery such as turn on all the lights. The voltage should be 14.4 if all is well. If you have less, you have a problem. Increase the RPM's, the voltage should stay the same. Lower the RPM's and check the voltage again. If the voltage does not remain close to 14.4, you have a problem that needs to be fixed.

Let me know what you find out. We do these 12 volt conversions and alternator repairs frequently in our shop.

Tim D.

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Jim WI

03-10-2003 10:40:15

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 Re: 12 volt conversion in reply to BC, 03-09-2003 19:04:28  
This test doesn't prove anything. The alternator may or may not keep charging with the battery cable removed.

To tell if it's really working, check the ammeter. If there's current going into the battery, the alternator is charging. For a better test, put a voltmeter on the battery and check the battery voltage with the engine running. You'll see something over 14VDC if the alternator is charging (I usually measure about 14.8 on my 2N).

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03-09-2003 19:40:24

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 Re: 12 volt conversion in reply to BC, 03-09-2003 19:04:28  
When you take the cable off, you are killing the power to the coil. The engine can't run without the coil.

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03-09-2003 21:37:30

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 Re: Re: 12 volt conversion in reply to opp, 03-09-2003 19:40:24  
Thanks for your reply.. but should'nt the alternator
supply the coil with voltage? you may have to excuse
me i may be looking at this like it were a car. THANKS

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03-10-2003 07:19:31

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 Re: Re: Re: 12 volt conversion in reply to BC, 03-09-2003 21:37:30  
I was wondering that, but a car doesn't use a one wire alternator (Does that make a difference? I don't know). Did you try disconnecting the cable at full throttle? I have heard that the one wire alternators need a lot of RMPs.

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