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Harry Ferguson Tractors Discussion Board

Re: Alternator Question

[ Expand ] [ View Replies ] [ Add a Reply ] [ Return to Forum ]

Posted by jdemaris on August 23, 2013 at 13:49:37 from (

In Reply to: Alternator Question posted by jcmorgan31 on August 23, 2013 at 07:39:30:

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

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


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