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Farmall & IHC Tractors Discussion Forum
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One more for Bob M

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Jimer

07-11-2006 19:19:42




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Re 12 v conversion on 300u. I got your diagram, and tonight I traced all the wires with a ohm meter. Finally found them all, the last one took about an hour. It is the one from the alternator to the ignition switch, which was broken off and disconnected. Before it appeared to be charging a few amps, and discharging a few amps with the lights on. Put it back together and started it up, holy buckets the amps jumped to +45 then came down to about 35 when I stopped it. But, stopping it wasn't quite right. Could not do it with the ignition switch. If I remember right, I need to install a diode in the wire from the alternator to the ignition switch, is that right?
The only difference I saw between the schematic you provided and my tractor is that my lights get power from the alternator post instead of the amp meter.
Please advise on the diode, and thank you for all the help!

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Jimer

07-12-2006 05:29:48




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 Re: One more for Bob M in reply to Jimer, 07-11-2006 19:19:42  
Thanks for all the help. I am confident at this point "we" got it fixed. Thanks again.



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Bob M

07-12-2006 04:37:47




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 Re: One more for Bob M in reply to Jimer, 07-11-2006 19:19:42  
45 amps? Alright!!

A diode as 'old" suggests will solve the running on problem.

Alternatively you can stick a small lamp - like a #164 instrument panel/side marker bulb in a suitable lamp holder - in the line between the ignition switch and the alternator #1 terminal. The resistance of the lamp will keep the engine from running on after the ignition is turned off. Also the lamp will work as a “idiot light” for the alternator, same as on your car…

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old

07-11-2006 21:57:34




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 Re: One more for Bob M in reply to Jimer, 07-11-2006 19:19:42  
Yep simple diode wired in to the #1 wire from the alternator will fix your problem. I use radio shack part #276-1661 and the line on the diode goes to the alternator side.



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