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Harry Ferguson Tractors Discussion Forum

Generator

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Don(Co.)

11-11-2004 08:29:28

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I had my 6 v. generator completely rebuilt and it only shows 6.4 volts with engine running fast. I thought I would get at least 7 Volts out of it. Is this normal and if not what can I do about it ?

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Mr Chapp

11-12-2004 07:36:51

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Re: Generator in reply to Don(Co.), 11-11-2004 08:29:28

Hi Don...6.4v is ok with a fully charged battery. How many amps, or do you have an ammeter? A fairly simple observation is as follows. Load the system ie lights on, spin over starter with coil wire disconnected etc. for a little while. Start the tractor. The voltage and amperage output should be greater now, because the battery is below 6v. When the battery voltage is sufficient the regulator will do its job and 6.4v will be the norm. I personally like an ammeter for one of my gauges. Good luck, have fun!! Mike

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gshadel

11-11-2004 09:05:23

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Re: Generator in reply to Don(Co.), 11-11-2004 08:29:28

I'm talking about a TO-20/30, other tractors may be somewhat different. I have a strong generator, I see about 6.4 volts with a good battery. The generator output is controlled by your V. regulator. The V. Regulator varies the generator output by varing the F(field) resistance to ground. If you have dirty terminals anywhere, (including the main ground lug on the dash) undersized wiring, or less than perfect ground to the regulator, the generator output will suffer.

I found my regulator seemed to provide more consistent output by wiring a jumper from the main ground lug behind the dash right to the regulator ground screw where it bolts to the tractor frame, to make sure I had a good, direct ground to the regulator. One way to test the max output on your generator is to jump the F term. on the generator to ground. That will make the generator run at full output, you can then measure your max. volts and amps. You will probably get ~7.2 volts & ~20 amps full output if I remember correctly on that.
A weak regulator can contribute to that too... but a lot of the time, clean connections and grounds will keep your battery charging good.

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danct

11-11-2004 09:02:03

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Re: Generator in reply to Don(Co.), 11-11-2004 08:29:28

Don
did you polarize the generator after you put it in ,anytime you work on them you have to do so.
just type in polarize in the archives and read about it
good luck
Danny

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