1953 Ford NAA electrical problem

   / 1953 Ford NAA electrical problem #1  

gzulauf

New member
Joined
Apr 2, 2012
Messages
3
Location
muskegon
Tractor
1953 ford NAA
I may have reversed the poles of my newly charged battery when placed into the NAA (original 6V system). The tractor started up fine but when turned off the generator kept turning. Yes, the fan belt was loose and the battery was turning the generator! I had to disconnect the battery to stop the generator from turning! Please advise.
THANKS.
 
   / 1953 Ford NAA electrical problem #2  
I can't explain why your generator is turning like a motor, but normally when you accidentally hook up the batt. terminals backwards you have polarize your voltage regulator. You should be able to find instructions for this on the net easily.
 
   / 1953 Ford NAA electrical problem
  • Thread Starter
#3  
THANKS Strum56. I jumped the ground and field connections at the voltage reglr. to repolarize the VR coils as suggested at another website. THis did work and I am back in business. I am smarter for this and thankyou for your post.
 
   / 1953 Ford NAA electrical problem #4  
THANKS Strum56. I jumped the ground and field connections at the voltage reglr. to repolarize the VR coils as suggested at another website. THis did work and I am back in business. I am smarter for this and thankyou for your post.

wow.. you are lucky. And there's plenty of misinformation in this thread~!

NAA electrical systems are B circuit.

you polarize the GENERATOR, not the vreg.

to polarize the B circuit gen, you jump bat hot to FIELD with reg disconnected.

older A circuit systems such as an 8N jumped bat to arm to polarize. This should work on a B circuit as well and would not hurt it.. though you can do the opposite and polarize an a circuit like a b circuit or you will burn up a 40$ regulator.

Generators will motor when you apply power to their armature. that's normal, and indicates you have a good genny.

since the vreg field contacts are closed at shutdown, hitting armature with power will make it spin.

your vreg cutout contacts were stuck closed due to the incorrect polarazation.. however.. they did serve to polarize the genny anyway, at shut down, as a motor test will set the polarization.. and if she spun after shutdown, she was motoring.

save this post so you can repolarize the genny correctly next time you need to, and not risk burning up 40$ vregs. and if in doubt, ask.. plenty of people here 24-7 glad to help :)

soundguy
 
   / 1953 Ford NAA electrical problem
  • Thread Starter
#5  
THANKS soundguy for your input. After taking the vreg out and examining how it operates (first time), I am beginning to better understand the electrical system on the NAA. The vreg seems to be fine, but I will not know until I operate the tractor and see if the battery is not charging. I will test tomorrow. Most importantly, I have taken steps to not make this mistake again. http://www.tractorbynet.com/forums/images/smilies/2/thumbsup.gif
 
   / 1953 Ford NAA electrical problem #6  
the good part is, if the genny motors, sh'es 99% chanc3 to be good.

if she won't charge, but motors, then the vreg is usually bad, and you can test by bypassing cutout, and full fielding her.
 

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