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Wierd charging problem, et al

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Robin

06-07-2001 20:47:12




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Greetings to the board!

1948 8N138753

Firstly, I had a charging problem; it didn't charge... jumped the ARM and BAT terminals, no joy... grounded the FLD terminal, charged like crazy... replaced the VR, and followed the procedures provided in the box verbatim.. seemed to resolve the problem...

Today, after working the tractor for an hour or so, it began to act like it did when it wasn't charging; starts missing badly under load... I checked the ammeter, and it looked like it wasn't showing any charge (it had been showing about 5 amps when I first started it)... I turned on the lights, and the ammeter showed a discharge... after shutting it down and allowing it to cool off, I restarted it (fired right up, no jump or anything) and it again showed about a 5 amp charge... eventually it showed barely above zero.. I turned on the lights, and at idle it showed a discharge, but at running RPM it showed just above zero... while I was trouble shooting the original problem, I ran the tractor for over an hour or so with the generator FLD terminal grounded, but kept the revs down to keep the charging rate below 15 amps... and it ran like a champ... could the missing when hot be something else? tight valve? (hope not)...

Question two... on the carb... is the big screw the idle mixture and the little screw the run mixture? What is the ball-park adjustment? 1 - 1.5 turns out from bottom?

Lastly, where can I get a right side "drag link" (the simple steel bar that reinforces the lower mount points) for the 3-point? Got one on the left side, but not the right...

Thanks, folks... really appreciate the advice!

Regards;
Robin Arthur Gustavson
Indian Creek Ranch
Link

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Claus

06-07-2001 23:43:27




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 Re: wierd charging problem, et al in reply to Robin, 06-07-2001 20:47:12  
You may find this hard to believe, but I think it is time for a new battery. First let me say, that you used good troubleshooting techniques and understand why you changed the voltage regulator. After all it sure pointed in that direction. What I believe is happenining with your battery, is that as it is getting older, the internal impedance in increasing. The net effect is like putting a resistor in series with the battery. The battery under this condition will not accept a charge unless you hit it with considerable higher voltage, which you are doing when you short the field terminal to ground. This is where we get led astray, since this test "prooves" that the vr is at fault. When it starts to run rough, the battery voltage is dropping to the point that the ignition system suffers. If you were to put a meter on the battery you would get an erratic reading due to the spikes that the generator puts out. Do not use a microprocessor based meter to look at the battery voltage. These do not react fast enough and sometimes will blow. This happened to me and I finally used my oscilloscope and found a 300 volt peak to peak pulse. This is why some of the vintage Ford folks are having trouble with their Petronix Ignition Systems. They seem to blow the amplifier and no amount of filtering has cured the problem. This is one of the anomalies with the 6 volt generators.
Happy Motoring
Claus

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Robin

06-08-2001 09:00:57




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 Re: Re: wierd charging problem, et al in reply to Claus, 06-07-2001 23:43:27  
Claus:
Would this battery condition result from having a new battery go through a number of deep charge / discharge cycles? This battery was purchased new several months ago, but to get any work out of the tractor, I had to charge the battery and run the tractor until the battery started to go flat; then put it back on the charger; run it till it was flat; etc... the battery still takes a charge, but I'm sure the system in the tractor has nothing like the output of my plug-in battery charger (yes, it's a 6 and 12 volt charger!)...

Thank you for your support of the "community"!

Regards;
(r.a.g.)

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Claus

06-08-2001 09:45:54




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 Re: Re: Re: wierd charging problem, et al in reply to Robin, 06-08-2001 09:00:57  
Automotive batteries are not designed for deep discharge. Boat batteries are and usually indicate this on the case. It is difficult for me to determine how much if any damage ocurred by your deep cycling. Certainly something sounds fishy with your battery.
Happy Motoring
Claus



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8NRay

06-07-2001 21:41:51




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 Re: wierd charging problem, et al in reply to Robin, 06-07-2001 20:47:12  
Not sure what's happening when it misses, but your description of the generator operation seems normal. You do need to have the rev's up for the generator to charge.
The small carb screw is the idle mixture and the large is the main mixture. 1 turn out from the bottom should be a good place to start.

The bars are called stablizers and you can get them at any tractor supply place or order them from one of the fine folks who advertise on this site.

Nice pics. We got as much ice down here in central Texas but no snow. Sure broke lots of limbs.
Also I'm thinking of getting us a donkey.

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Robin

06-08-2001 21:50:48




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 Re: Re: wierd charging problem, et al in reply to 8NRay, 06-07-2001 21:41:51  

Thanks for the info...

Yeah.. this winter in north Texas was tough... we even got to spend a week in survival mode over the new years holiday while the power was out!! Got to finaly use some of that Y2K stuff for something other than camping! I'm just now getting thawed and dried out...

We had been in Austin for the last 20 years, but got fed up with the "new" Austin, and had a chance to buy the place next to my wife's sister and husband's place...

Donkey's are great... Molly likes to "help" when we're doing fence or brush work by stealing hats, watching what we're doing over our sholders and making sure the graze around the truck or tractor doesn't get overlooked...

Regards;
(r.a.g.)

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