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12 volt problem, wires burnt

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Stone

06-14-2001 19:24:40

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I have been having a problem with my wires burning, I have replaced them once thinking that the old one's were the problem. I replaced them with 14 guage, should it have been bigger?

I also have a problem with my ignition switch, it won't cut off the engine.

I have looked at all the wiring diagrams, and it
seems that it is hooked up okay. I also notcied that the amp guage always is chargeing at about 30 amps is this normal?

My tractor is a ford 850, 1957 model, just bought
it two weeks ago, and have been working on it ever since.

please help, I'm at my last straw

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Jerry D in NC

06-14-2001 20:38:06

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Re: 12 volt problem, wires burnt in reply to Stone, 06-14-2001 19:24:40

What we have here is a botched 12 volt conversion. What kind of alternator does it have on it. The regulator is not working and the coil needs a diode put in series with the alternator precharge line. OK in English, the previous owner tried to convert it and failed. We will need to trace the wires and figure out how it is wired. These are all classic symptoms of a convertion done wrong. This forum has the expertise to help you through this. Don't pull out any hair over this one because you probably won't even have to buy any parts...

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Stone

06-15-2001 12:11:46

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Re: Re: 12 volt problem, wires burnt in reply to Jerry D in NC, 06-14-2001 20:38:06

Well to start with, The delco alternator I got at the tractor supply is supposed to have a regulator
in it. I was told that the post on it labled r was supposed to go back to the bat post so it could since what the voltage, when I did this I started burning wires up.

I spoke with the tractor dealer today and they said it sounds like a dead short, but everything looks good.

Should it charge all the time? Before I burnt up the wires it would show about 20amps.

I checked the terminal post to see if it was shorted and it looked fine.

I may have made one mistake by useing 14 gauge wire off the bat terminal.

Could this have caused the problem?

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Jerry D in NC

06-15-2001 19:11:05

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Re: Re: Re: 12 volt problem, wires burnt in reply to Stone, 06-15-2001 12:11:46

Is the Delco a 3 wire or a 1 wire alternator. If it is the 3 wire then the post is connected to the battery. The plug that goes into the other connector the red can be connected back to the battery post connection and the white wire needs to be connected to something that is switch controlled such as the coil or the switch itself. This wire is used to excite the coil to "create" the magnetic field needed to cause current to be generated. Now my opinion on why the starter switch does not turn the tractor off after the key is turned off is that this is wired to something that is connected to the coil. This white wire kinda looses its meaning once the alternator turns fast enough to activate the regulator and this now provides the field voltage. What the regulator does however, at this point, is put voltage back onto the white wire and it will then supply 12 volts to the coil no matter where the key is. That is my theory about the reason the key will not turn the tractor off. As for the 14 gauge wire it should not cause anything to burn up unless it is melting itself. As for the thing charging at 20 amps full time that is wrong unless there is a dead short on the output of the alternator. Do you know how to use a volt meter. If so then see what the voltage is at the battery before you start the tractor, once you turn the key on and after the tractor is cranked and running. If the voltage is higher than 15 volts then the alternator has probably gone bad and you should take it and have it tested.

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Stone

06-16-2001 06:41:22

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Re: Re: Re: Re: 12 volt problem, wires burnt in reply to Jerry D in NC, 06-15-2001 19:11:05

Thanks Jerry, I'm going to have it tested today.
I spoke with the tractor dealer and the said, about the same thing.

I have seen that a lot of people put a marker light on p1 off the alternator, could this be my problem?

I read somewhere that the ignition will not shut off due to voltage going out of p1.

Thanks

Stone

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Jerry D in NC

06-16-2001 13:12:48

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Re: Re: Re: Re: Re: 12 volt problem, wires burnt in reply to Stone, 06-16-2001 06:41:22

What I usually do is put a diode inline with that white wire and allow current tl flow into the alternator just not out of it and that will fix the "not turning off" issue.

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Stone

06-16-2001 18:19:23

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Re: Re: Re: Re: Re: Re: 12 volt problem, wires burnt in reply to Jerry D in NC, 06-16-2001 13:12:48

Thanks, were can I get a diode?

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Jerry D in NC

06-17-2001 16:25:13

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Re: Re: Re: Re: Re: Re: Re: 12 volt problem, wires burnt in reply to Stone, 06-16-2001 18:19:23

Radio Shack should have them. Just get a 1N914 or similar. Doesn't have to carry much current.

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