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Harry Ferguson Tractors Discussion Forum
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Re: Alternator Question

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jdemaris

08-23-2013 13:49:37
70.192.47.134



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The general answer is "yes" but I have no idea how you've got everything wired.

#1 - what do you have for an "ignition" switch?
If when turned "on" it connects your battery-
positive to your coil - it will run regardless of what the alternator is doing.

Considering that once "off" and you try to restart - and you've got no spark - it sounds obvious that there is no 12 volts-positive wired to your coil from your ignition switch. It DOES sound like you've got a connection between your alternator and your ignition. Since you've got it hooked up "two wire" I assume and not "three wire", the field-exciter circuit on the alternator is probably backfeeding to your ignition circuit when charging and keeping it running. Just a guess since I have no idea how you've got it wired. The exciter wire goes to the plug-in connection post #1.

By the way - there's a subtle difference between "two wire" and "three wire." Two-wire is when you loop the small voltage-sensing wire (#2 at the plug-in connectors) back to the big post on the alternator. Three-wire is when you run that voltage sensing wire all the way to the battery. It serves no purpose on a tractor since the battery is often close. It IS used on autos because the voltage at the battery tends to be slightly different then at the alternator output post.

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jcmorgan31

08-23-2013 14:08:30
12.59.56.66



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 Re: Alternator Question in reply to jdemaris, 08-23-2013 13:49:37  
Quoting Removed, click Modern View to see

The ignition switch I have is a key switch bought from Tractor Supply for my tractor.

I have a three wire alternator with the sensing wire connected back to the battery post on the alternator.

I never said I didn't have spark. When I shut my tractor back off, the battery is completely dead and will not crank the engine over. As soon as I hook up the jumper cables, it fires right up.

I'm going to put a new alternator on tonight and see what happens.

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jdemaris

08-23-2013 16:00:28
70.192.47.134



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 Re: Alternator Question in reply to jcmorgan31, 08-23-2013 14:08:30  
I misunderstood. I assumed you were doing all this with a charged battery. Are you sure your alternator hook-up isn't draining the battery? Obviously the alternator is charging or the machine would not run with a stone-dead battery. So the question in my mind is - why isn't the current that is suppling the ignition coil making its way to the battery to charge it?

Seems either your alternator output is not connected to the battery - or you've got a bad battery - or your alternator is draining it after shut-down.

How are you getting current to the #1 exciter on the alternator? You cannot wire it directly to the IGN terminal on the key-switch unless you stick in some resistance or a diode. You CAN run it to the ACC terminal which is isolated from the IGN when the key is off. I'm assume that part is working OK if the engine shuts off when you turn the key off.

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