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Overcharging

J

Jesse Goodling

Member
I have a 6 volt Ford 600, and have changed out the voltage regulator twice, but it keeps overcharging, like up to 16-17 volts at high throttle. From some older posts it looks like if I disconnect the field wire from the VR and if the amps stay high, there is a short of that wire to ground. Is that correct? Also, there was a post that it could be shorting out at the generator post. Is it supposed to be insulated from housing at the generator? Thanks for replies.
 
(quoted from post at 18:21:18 01/18/18) I have a 6 volt Ford 600, and have changed out the voltage regulator twice, but it keeps overcharging, like up to 16-17 volts at high throttle. From some older posts it looks like if I disconnect the field wire from the VR and if the amps stay high, there is a short of that wire to ground. Is that correct? Also, there was a post that it could be shorting out at the generator post. Is it supposed to be insulated from housing at the generator? Thanks for replies.
Click to expand...
o, not on a 600, but that info was good for 8Ns. Generator Field on 600 receives power from the regulator on 600s. Disconnect it and output should drop to a very low amount.
 
I started it up and just watched the amp meter, it was charging way over 30 amps. After a while it stopped charging altogether. Tried taking off the field wire , no
difference. Is the voltage regulator fried again?
 
If not charging at all, then removing the field wire should make no difference. If as you first asked, if overcharging, then removing the field should stop that. Now which is it? What are we dealing with , over on none?
 
What are the long term effects? Is it boiling the battery? What is voltage across battery posts after it runs awhile and you turn the engine off?

What are you using for a volt meter. If you are using an inexpensive digital meter, it is normal on those for electrical hash from generator and ignition to cause the meter to read very erratic.

Finding a reliable generator regulator seems to be a real problem. If it were mine and it truly is overcharging, I would change it to a 12 volt Delco 3 wire alternator with internal regulator. A more reliable solution and less costly in the long run.
 
It charged for a while at the high rate and then stopped. Now there is no charge showing on the amp meter. Back to may original question, what was making it charge that high in the first place? This is the second new VR. I know it is not charging again because it barely turns over now.
 
" I know it is not charging again because it barely turns over now." That is no indicator of charging or not charging. You need voltage & ampere readings for that. Why high charge rate in the first place? Maybe the battery just needed charging & the gen & VR were doing exactly what they were supposed to be doing. On that "B-ckt" system, a low battery voltage causes the VR's field contacts to close and supply full voltage/current to the generator field, resulting in maximum generator output.
 
Before I shut it off the last time the amp meter went to 0 amps
and I measured 2-3 volts at the generator and the same at the
battery with a volt meter. So for this whole sequence, I had
installed a new VL, got it running, amps and voltsvwere both
way too high, then went to 0 amps and 3-4 volts. Shut it off
and now too weak to barely turn over. So my question is what
makes it overcharge?
 
(quoted from post at 14:57:38 01/19/18) Before I shut it off the last time the amp meter went to 0 amps
and I measured 2-3 volts at the generator and the same at the
battery with a volt meter. So for this whole sequence, I had
installed a new VL, got it running, amps and voltsvwere both
way too high, then went to 0 amps and 3-4 volts. Shut it off
and now too weak to barely turn over. So my question is what
makes it overcharge?
Click to expand...
f... you saw a battery voltage of 16 volts within a couple of minutes of startup, then you probably did not have a good 6v battery. A good battery, properly & well connected will not have its voltage raised to 16v that quickly (if ever) with the meager output that those generators are capable of producing. People can't just guess these things. You have to measure & have good data to make a decent diagnosis. Put you battery on a charger, & measure post to post (not terminal of connector) and when it reaches 7.3 volts, remove charger & let it sit for 30-45 minutes & re-measure. If at 6.25 or more, call it charged. Re-install in tractor & start & measure post to post battery voltage. Post results. We will go from there.
 
OK, disconnected battery, charged all day, measured voltage at posts and only got to 6.15 volts. The last owner said it was a new battery. Started it up, amp meter
stayed at zero. Jumpered VR base to ground, no change. Jumped Arm to batt on VR, amps went negative. Jumped field to batt, amps stayed at zero.
 
(quoted from post at 13:29:24 01/21/18) OK, disconnected battery, charged all day, measured voltage at posts and only got to 6.15 volts. The last owner said it was a new battery. Started it up, amp meter
stayed at zero. Jumpered VR base to ground, no change. Jumped Arm to batt on VR, amps went negative. Jumped field to batt, amps stayed at zero.
Click to expand...
rom here............I think battery voltage is suspect, and it did start, but other indications are that a new battery will not fix all your problem. To try & eliminate the generator as the bad guy, temporarily (meaning do leave it this way more than about a minute or two) jumper all there together, batt, arm, field. If charging, then I say generator as well as battery connections are OK.
 
(quoted from post at 15:21:18 01/18/18) I have a 6 volt Ford 600, and have changed out the voltage regulator twice, but it keeps overcharging, like up to 16-17 volts at high throttle. From some older posts it looks like if I disconnect the field wire from the VR and if the amps stay high, there is a short of that wire to ground. Is that correct? Also, there was a post that it could be shorting out at the generator post. Is it supposed to be insulated from housing at the generator? Thanks for replies.
Click to expand...


Did you ever find out what was wrong? I have exact same issue.
 
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