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Farmall & IHC Tractors Discussion Forum
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Gerator on Super A causing me Grief.

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Brian

10-22-2003 19:51:13




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I posted a couple of weeks ago that I was have problems with charging on my super A. It is a 6volt system, has the 4 position switch and a mag ignition. Here's what I've done.

1. Had the generator checked out by a local shop, they said that although dirty the generator itself was fine. They gave it a cleaning and it looks good. They did say that the voltage regulator may have been bad and put a new one on. We made sure it was set up for positive ground and it was re-polarized.

2. I checked the wiring to BOB M's diagrams...unless there is something I'm missing it looks good.

3. I checked the continuity in the wires to make sure they were ok and they seem fine.

4. There is 7 volts between the bat terminal on the regulator and ground (bat. volt obviously). My understanding is that there should be more like 10volts when the tractor is running.

5. I have the belt hooked up.

6. I'm pretty sure the gauge works, it worked at the begining of the year showing charge, and when I turn on the lights it show neg. current of about 10 amps. When I run the tractor though it doesn't move to the positve.

7. I've tried the switch in both positions, low and high.

8. I've checked for continuity between the batt terminal on the starter and the gauge, between the gauge and the fuse and the fuse to the switch. I've also check between the amp gauge and the batt terminal on the regulator. I've also got a good wire between the field and the screw which attaches to the resistor that comes on the switch.

9. There is continuity between the screw before the resistor and after, although there didn't seem to be much resistence with the switch in either position.

I just can't seem to get this thing to show a charge. Anyone have any suggestions befor I go bald from pulling my hair out ? I'm in the dark here.


Thanks for you replies.

Brian.

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steve

10-23-2003 19:31:05




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 Re: Gerator on Super A causing me Grief. in reply to Brian, 10-22-2003 19:51:13  
the light switch is used to ground the "F" terminal of the generator. bypass the switch by running a wire from "F" to ground.
--start tractor and see how that works. if the amp meter does not show a few amps charge and volt meter show slight charge, then...
--- Take the "G" terminal and "B" terminal wires on the regulator and connect together. this will bypass regulator and run generator "A" to the ampmeter, then thru ampmeter to battery. (other side of battery is gound)...
--start tractor and note charge, the regulator is out of the system and the generator should go to "full charge" which will only be 10 amps. you can run this way for several minutes for a test.
--you have now narrowed down if you have a good switch, if the regulator is working, and if the generator is putting out power.
--by the way, if you take the wires off the generator and ground the "F". then startup the tractor and measure voltage across the A and F terminals (A connected to nothing) you will get probably 10-15 volts output. it is the battery and regulator that adjust it down to 6 volts.

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Allan

10-23-2003 04:13:42




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 Re: Gerator on Super A causing me Grief. in reply to Brian, 10-22-2003 19:51:13  
Brian,

I agree with K-Mo. If you are showing around 7 volts with a voltmeter, I think you are charging just fine.

10 volts on a 6 volt system would indicate something is wrong, IMHO. I.E. The generator would be pumping full bore all the time; this is not good.

If the amp gauge is showing a "0" charge or just a little positive, then all is well.

The only time the amp gauge should go positive is when is is charging a low battery; usually right after you crank the tractor. It then should come back towards the "0" amps in just a short time if the battery is full and the regulator is doing it's job.

From what you describe, I think you have a very healthy battery, generator and regulator.

Am I missing something here?

Tryin' to help,

Allan

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K-Mo

10-22-2003 21:15:48




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 Re: Gerator on Super A causing me Grief. in reply to Brian, 10-22-2003 19:51:13  
Brian,
I won't try to respond to all your questions in one bite, but will offer a few ideas.
Voltage:
1. A full charge "6 Volt" battery would have 6.4 volts. A battery measuring 6 volts would be a dead battery.
2. After the tractor is started, the charge voltage should increase as the battery charges. The battery should be fully charged at about 6.8v. The charge voltage should not be allowed to exceed 7.5v. If you had 7v, it indicates you must have some generator action.

Connect a voltmeter to the battery and record the voltage. Start the tractor and the volage should increase. If it does, then the battery is getting a charge.

By the way, you need a voltmeter which allows you to accurately measure at least tenths of a volt (ie. 6.5v)

K-Mo

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