Re: for Gerald J and 35 A or anyone about generator

Posted by Gerald J. on August 03, 2007 at 11:50:32 from (67.0.103.142):

In Reply to: for Gerald J and 35 A or anyone about generator posted by flashback on August 03, 2007 at 10:29:30:

Your 6 volt generator will need a 12 volt regulator and lots of RPM to charge the 12 volt battery. It has to turn somewhere between 1.5 times and twice as fast to make 12 volts as it takes to get 6 volts. But if you can arrange that (like with a smaller diameter pulley) that can work. 12 volt generators in packages that look like 6 volt generators do exist. Machinery didn't change to alternators the instant they went to 12 volts.

If you don't want it to be original, its hard to beat an alternator, because the alternater (once its started charging if 1 wire) will charge at much lower engine speeds and because the alternator diodes make a perfect cutout it never discharges the battery with reverse current when running slow.

I also know that with a GOOD regulator, that a generator will do an adequate job and be original. My MF-135 had a new regulator on it when I bought it 20 years ago, but it didn't charge right. I tweaked the voltage adjustment and its been working fine ever since. One time I thought the battery was going bad, but it was the starter brushes that went open after I'd moved that battery to my '65 F350 and ran it there several years. This year I ran a 10 amp electric sprayer pump several hours a day several times and the generator kept up. And that sprayer pump was running continuously reecirculating to stir the spray mix when it wasn't actually spraying and I used it to inhale parts of the spray mix too.

Several say its worth the added wires to hook up a 1 wire alternator with 3 wires, then it doesn't need goosing to start charging. I have a 1 wire alternator on my JD 4020 and I with the smallest available alternator pulley it takes about 1600 engine RPM to start charging, then it charges down to 450 RPM or slower. I also have an ammeter added so I can tell what it is really doing.

One alternator discussion with picture is at:
http://www.ytmag.com/cgi-bin/viewit.cgi?bd=ttalk&th=500124

The same picture has been linked many times. And its good.

You don't really want the involvement of the multiple position light switch and don't need it if your generator is supplied with a regulator. That light switch is a manual current adjust and you probaby won't treat the battery nearly as nicely as a good voltage regulator will, and the solid state voltage regulators in alternators treat the battery better than the electromechanical voltage regulators sometimes do.

Gerald J.

• An alternator discussion

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