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Re: 10si Alternator indicator light necessary?
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Posted by Rod (NH) on April 04, 2004 at 21:23:00 from (12.148.160.138):
In Reply to: 10si Alternator indicator light necessary? posted by Daren in TN on April 04, 2004 at 19:30:09:
Hi Daren, As long as you wire it to avoid the problem John mentions, you do not need any resistor or light or diode. The #1 spade terminal needs to have 12v+ when the tractor is running and isolated from everything when it is not. On my diesel tractor I do this with a NO oil pressure switch that actuates at 5 psig in the line between battery + and the #1 terminal. On my gas tractor (magneto ignition) I use a DPDT 2 pos toggle switch to 1) ground the mag in the off position and also isolate that lead to the alternator and 2) take the mag off ground and also supply 12v+ to that #1 terminal in the on position. Works great. I take it you have a conventional battery ignition system so I don't know if your ignition switch is capable of being wired to avoid the problem John mentions. While a diode would prevent any feedback from the alternator via that lead, I don't really see how a resistor or a light would. The idiot lights in automobiles usually have 12v+ on both sides of their contacts - hence no light during normal operation. When the alternator fails, that #1 terminal goes to ground in the alternator and the light lights up. You are correct in just jumping the #2 spade terminal directly to the alternator main output stud.  Rod
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