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Order Ford 640 Parts Online

Re: Ford 640 wiring/battery connection

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04-28-1999 23:20:29

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The following is a quote from the "FORD Tractor Shop Manual" : 1. A generator that has been inspected or tested must be polarized in respect to the battery it is to charge. Failure to polarize the generator may result in regulator failure. 2. The generator is polarized by disconnecting the field wire and the battery wire from their terminals at the regulator, and momentarily touching the two together. (Engine not running). This quick surge of current correctly polarizes the generator. Connect the wires to their respective terminals on the regulator. [End quote.] These are not MY words, but are from the Wizards who gave us FORD tractors! I would suggest that you: (A) verify that you have a 6v generator-many were replaced with a 12v unit that looks similar - check the tag. (B) verify that you have a 6v positive ground regulator - it may have been replaced with something different. (C) verify that the ignition coil is correctly wired - the "hot" lead from the key switch goes to the negative terminal on the coil. The positive terminal on the coil should be wired to the breaker point terminal on the distributor. (D) Connect the battery cables so the positive terminal on the battery goes to ground. (E) Polarize the generator as described above. If you still do not get proper charging, regulator may be faulty. Before changing regulator, verify that ammeter is good by checking continuity of the ammeter. Usually if the generator goes bad, there is NO output. (On my tractor, the brush holders in the generator rust-up, preventing the brushes from making good contact with the armature.) If the field coils in the generator go bad, you will get NO output. The "Ford Tractor Service Manual" covers models 600/601, 700/701, 800/801, 900/901. I highly recommend you get it! It has more info

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Phil M

04-30-1999 18:38:04

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 Re: Re: Ford 640 wiring/battery connection in reply to Bruce, 04-28-1999 23:20:29  
Thanks for the very useful info. I haven't yet had a chance to do the battery switch and generator polarizing. However, when I test the generator by connecting the leads of a meter to any two of the three terminals on it (with the tractor running), I am only reading about 1.5V. I assume this would indicate that something is wrong with the generator, and not the regulator, since I am measuring at the generator. Is this true, or could the regulator somehow effect this reading? Also, is it possible that not having the generator correctly polarized could cause it to only be putting out 1.5V?

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05-02-1999 09:29:11

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 Re: Re: Re: Ford 640 wiring/battery connection in reply to Phil M, 04-30-1999 18:38:04  

I am not well qualified to address the theories of operation, but I believe your testing procedure may not be correct. The way I test for generator output is to measure the amperage put out by the generator, not the voltage. If you would like more info, e-mail me your address, and I can copy and send you some info. I highly suggest you obtain a copy of the "Ford Tractor Service Manual", as it covers your whole tractor in detail as well as giving complete coverage on testing and repair of the charging and starting systems.

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Drew / Millington, MI

04-30-1999 16:26:29

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 Re: Re: Ford 640 wiring/battery connection in reply to Bruce, 04-28-1999 23:20:29  
Weird! I've got to think about this one. What in the generator needs to be polarized? The brushes?

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