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Order Ford 640 Parts Online

Re: Next step for reviving my 640

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Sean in PA

10-28-2019 19:34:13

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12 volt battery and a ballast resistor will let it run, but it won't charge the battery. I would recommend disconnecting the generator from the voltage regulator while you're running it with a 12 volt battery. You can put it on a trickle charger between times that you're running it. If your plan is to convert it to 12 volts once you think it is worth it, then I would go ahead and do what you've planned for now.

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10-28-2019 21:03:52

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 Re: Next step for reviving my 640 in reply to Sean in PA, 10-28-2019 19:34:13  
Not a good idea to run a generator disconnected. Any residual magnetism inside the field coils could cause it to generate power with nowhere to go. This will cause the generator to overheat and be damaged.

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Ultradog MN

10-29-2019 02:57:09

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 Re: Next step for reviving my 640 in reply to Bern, 10-28-2019 21:03:52  
I've been running my 3000D for 6 years with No wires hooked to the generator. It's just a belt tensioner.
Do you think I hurt the generator?

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Jeeper Creeper

10-29-2019 15:19:52

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 Re: Next step for reviving my 640 in reply to Ultradog MN, 10-29-2019 02:57:09  
Six years? So what are you doing? Do you keep the battery on a charger then not run it long enough to need the battery to be charged while in use?

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Ultradog MN

10-30-2019 01:05:41

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 Re: Next step for reviving my 640 in reply to Jeeper Creeper, 10-29-2019 15:19:52  
3000D = diesel
You need a battery to start it (or park it on a hill) and then no electrics required.
I know, I know, it's a schlocky way to run a tractor for 6 years.
I've had an alternator and wiring harness on it twice but stripped it all off to put it on another tractor to get it sold.

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10-29-2019 05:36:00

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 Re: Next step for reviving my 640 in reply to Ultradog MN, 10-29-2019 02:57:09  
Evidently not in your case. The key word in my last post was "could" cause the generator to overheat. It all depends on the residual strength of the field coil magnets. If the magnets are weak enough, any power developed is turned into heat and dissipated via the fan.

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