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Re: Perplexing alternator problem

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Author  [Modern View]

05-08-2013 17:10:35

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What I would do if I were you... start by hooking a ground wire from the alt case to some point on the engine block or mount so you know the alt has good ground. Then take a #4 wire from the BAT post directly to the Bat+ side of the starter relay so you know you have a direct connection to the battery. Make sure #2 is hooked back to the BAT on the alt and #1 is supplied battery voltage through the key or jumper or whatever so it's excited. When this is all done... start the engine and rev it to 2000 rpm or so... thus you know it should be charging. If it doesn't make 14+ V at the battery, get another alternator. If it's warranty... probably don't discuss this so much. Just install the new one as stated above.
For my own part I'd much rather see the exciter wire run through a 194 bulb from the key. Then you have a charge indicator light. Voltage is really the only measure that counts with alternators...
If you want to rehook the ammeter after all is known to be working... I would suggest you make sure and have at minimum a 60 amp meter... and wire it such that all of the tractor's electrical loads other than the starter are run through the ammeter... so one side of it is the main electrical terminus (including the alternator's BAT wire) and the other side goes directly to the battery pos at the starter relay.


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05-08-2013 17:35:07

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 Re: Perplexing alternator problem in reply to RodInNS, 05-08-2013 17:10:35  

Ground is good. Everything else was done as you stated except for the 194 bulb. AMP meter is 60 amp. I beg to differ on the 2000 rpm revs. That seems kind of high.

I appreciate your advice.

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05-08-2013 18:12:39

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 Re: Perplexing alternator problem in reply to Greg1959, 05-08-2013 17:35:07  
It should charge at a lot less than 2000 rpm... but without knowing what you've got on it for a pulley... I say 2K to be certain. Some will charge at 800. Some less if they've been setup with a low cut in.
If all has been done and it still won't charge, replace it.
Just the same... I'm not a big believer in the idea that 2 have now burned out for no reason... Make sure there isn't something grounding out and making smoke somewhere else in the system. That WILL fry the reg... sometimes.


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05-08-2013 18:17:58

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 Re: Perplexing alternator problem in reply to RodInNS, 05-08-2013 18:12:39  

I'll re-check wiring in the morning for a possible ground.

Thanks again

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