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EFV-8 Club Forum / General Ford Discussion / polarizing generator

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Posted By Discussion Topic: polarizing generator -- page: 1 2     dcgriff 05-27-2015 @ 7:01 PM reply profile send p.m. Member Posts: 6 Joined: Apr 2015 Since installing the rusty old original regulator, I've put about 100 miles on the car an the motor turns over, starts and runs like new. You're spot on about cheap digital volt meters but with my trusty old needle style VOM and your advice on how to test the regulator output I was able to ascertain that the old regulator was working. We have a good generator shop here if I need any fine tuning with the charging system, but I'm leaving everything just as it is for now. Rust is good! TomO 05-27-2015 @ 7:33 AM reply profile send p.m. Senior Posts: 7261 Joined: Oct 2009 Using the amp gauge in the car to adjust a voltage regulator could lead to damaging the generator. The proper way to adjust them is to check the voltage at the regulator with a precision voltmeter and a 0.75 ohm resister. The inexpensive digital meters sold today are so unreliable as to their readings, that I would not want to use one for any reading except to see if voltage is present. If your regulator needs adjustment and you do not have an USA made precision voltmeter like a Fluke, take the regulator to a generator repair facility and have it adjusted there. Tom LazarusLong 05-26-2015 @ 8:51 PM reply profile send p.m. Member Posts: 13 Joined: Apr 2015 Sounds like the points in your new regulator may be sticking. Take the cover off and file them with a finger nail file,and then start the car up while the regulator cover is still off so you can see if the points are opening and closing. You can even adjust at least some of the regulators to put out a little more charge if you want. You either need two people to do this so someone is watching the amp gauge inside the car as you adjust the points,or you need a amp gauge connected at the battery so you can see what is happening as you work. TomO 05-25-2015 @ 7:19 AM reply profile send p.m. Senior Posts: 7261 Joined: Oct 2009 I am glad that you solved your problem. The 39 and 40 Fords and Mercurys had a voltage gauge in the instrument panel and i have always liked that better than the ammeter in the other years. I still have a hard time determining if my battery and generator are working correctly with an ammeter. Tom dcgriff 05-23-2015 @ 6:41 PM reply profile send p.m. Member Posts: 6 Joined: Apr 2015 Well that was a big help. After fully charging the battery, I tested the voltage as you described and had the same voltage that I had across the battery terminals, about 6.7. When I turned on the headlights voltage went to 6.1. So I removed the new regulator and replaced it with the rusty old regulator that was on the car for God knows how long, and voltage went to 7.2 +. Even with headlights on it only dropped to about 7. I drove about 15 miles with the headlights on and shut the car off. Motor turned over great and started right up. So, at this point, all seems to be well Many thanks for your advice. TomO 05-23-2015 @ 7:37 AM reply profile send p.m. Senior Posts: 7261 Joined: Oct 2009 You will not damage anything by polarizing the generator. If your battery was connected with the NEG post gong to ground, and then connected with a POS ground, you will need to do this. Your battery should be connected with the POS terminal going to ground. Before you do this, connect your volt meter with the COM or black lead to the BAT terminal of the voltage regulator and the POS or red lead to ground. Start the engine and increase the RPMs to about 1,500 RPM and read the meter. It should read 7.2 to 7.4 volts. If it reads a negative voltage, you will need to polarize the generator. Let us know the results and if you still have a problem, post it here and I can give you some more tests to check out your charging system and battery. Tom dcgriff 05-22-2015 @ 9:10 PM reply profile send p.m. Member Posts: 6 Joined: Apr 2015 I appreciate everyone's input on this subject. From the info, I'm surmising that it certainly won't hurt to polarize the generator. What's weird is that the generator seems to be working - the headlights dim a bit at idle, then brighten as soon as I step on the gas, however the battery doesn't charge. I installed a new 6V battery and new regulator. I drove the car about 6 miles with the headlights on and checked the headlights as above, and shut the car off. I tried to restart it right away and just got that rattling solenoid. The battery had a full charge when I first started it and it seems amazing that it would fully discharge in 6 miles, even with the headlights on. cliftford 05-22-2015 @ 7:50 PM reply profile send p.m. Senior Posts: 845 Joined: Jan 2014 Back in the day most non dealer repair shops used Motors or Chilton repair manuals for most repair work. Mitch*lls manuals may have been available, but I do not recall having them. Anyway as I recall. both manuals recommended polarizing the generator when any gen. or regulator work was done. It was standard practice. 42wagon 05-22-2015 @ 12:01 PM reply profile send p.m. Senior Posts: 586 Joined: Oct 2009 Tom I'm not going to get into an argument with you on this subject. In my first response I quoted directly from a book that has been on my shelf for sometime titled The Ford Owner's Complete Handbook of Repair and Maintenance. by William J. Lipsett and published by Floyd Clymer in 1949. The book says it covers all models from 1932 thru 1949 including V8, "60", and Ford 6. You will note the quote only says "when installing a generator" nothing about the battery or regulator. The inference being that you might have taken apart and reassembled the generator or someone else has. The other item I quoted is directly off of Google when you type in "polarizing a 6 volt generator". This is where the discussion of the battery and regulator comes from. I make no claim for the validity of doing this but it is in the book. You will also note the the original question was from dcgriff who says he has always polarized generators on his motorcycles and wondered why no one was suggesting doing it for the same type generator on Fords. You may do what you wish, I will continue to polarize my generators whenever I take them apart. TomO 05-22-2015 @ 9:36 AM reply profile send p.m. Senior Posts: 7261 Joined: Oct 2009 42Wagon, I have gone through the Service Bulletins, the reprint of the 39-48 Service Manual, the 49-51 Mercury Overhaul Manual and the Lincoln Mercury Master Check and have found NO reference to polarizing the generator or regulator. The procedure that I quoted came from a replacement voltage regulator and was to be used only if the generator did not charge after replacement. Could you please let me know which Ford Service manual that you found this in? If you had to polarize the generator to the regulator every time that you disconnected the battery, I would have to do this every time I wanted to use one of my cars with a generator, as I disconnect the battery when I park them for the night. Tom

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