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Ford Tractors Discussion Forum
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12 volt questions for the electric gurus

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Lynn Patrick

04-25-2017 10:55:18




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1957 960 w/12 volt conversion. This has worked for several years, then recently quit charging. Checking wiring I found a broken wire at the diode. I know either a diode or light may be used. Now my questions: I have a battery disconnect I always turn off when shutting off the tractor. If this is always done, is a diode/light necessary? I understand the diode only allows electricity to flow in one direction, so how does a light keep electricity from flowing the wrong way, or does it only remind you the battery is discharging?
Please forgive my ignorance. Only trying to learn!

Thanks in advance for helping me understand.

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budman007

04-27-2017 10:09:57




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 Re: 12 volt questions for the electric gurus in reply to Lynn Patrick, 04-25-2017 10:55:18  
Quoting Removed, click Modern View to see need help. Where can I buy a fuse link for my 1710 ford tractor?? It is a small piece of wire coming of the starter solenoid and terminates in a wiring harness. The total length is about 5 inch long. It burned out.



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JMOR

04-25-2017 14:44:16




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 Re: 12 volt questions for the electric gurus in reply to Lynn Patrick, 04-25-2017 10:55:18  
Quoting Removed, click Modern View to seeIf I were you, I wouldn't use it either, but I'm not. Rodents/fire and parasitic (alt reg, radios, other electronics in some instances) drains are all good reasons for some.



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David G

04-25-2017 14:36:39




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 Re: 12 volt questions for the electric gurus in reply to Lynn Patrick, 04-25-2017 10:55:18  
I have never seen the need for battery disconnect, keep wiring in good shape, will never use it



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Lynn Patrick

04-25-2017 11:55:50




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 Re: 12 volt questions for the electric gurus in reply to Lynn Patrick, 04-25-2017 10:55:18  
He sure did! Thanks Bob & Soundguy. Even I can understand that! Just what I wanted to know.

Thanks again!

Lynn



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old

04-25-2017 15:28:31




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 Re: 12 volt questions for the electric gurus in reply to Lynn Patrick, 04-25-2017 11:55:50  
By the way if you use the disconnect while the engine is running you can/will fry the alternator because if it is working as it should the alternator will provide the power to keep it running but in doing so it will go to max charge and fry it self in a blink of an eye and even be unsafe to you



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soundguy

04-25-2017 11:53:23




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 Re: 12 volt questions for the electric gurus in reply to Lynn Patrick, 04-25-2017 10:55:18  
Bob supplied the perfect answer.



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Bob

04-25-2017 11:11:01




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 Re: 12 volt questions for the electric gurus in reply to Lynn Patrick, 04-25-2017 10:55:18  
A diode, resistor, or "idiot light" stops or limits current flowing OUT of the alternator's excite terminal.

This stops the alternator from powering the ignition system when the ignition switch is turned "off", preventing the engine from running on using alternator power, and also protects the alternator form possible internal damage.

A diode stops reverse flow altogether, but lets current flow in the opposite direction to provide "excite" current for the alternator at startup.

A resistor or "idiot light" flows enough current to "excite" the alternator, but limits current to a low enough value there's not enough to fire the ignition system, causing the engine to "run on" or damage the alternator under certain conditions.

You didn't say what alternator you have, the following diagrams are Delco, but other internally-regulated alternators would be similar.

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