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12-23-2021, 05:49 PM | #1 |
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Join Date: May 2019
Location: ILLINOIS
Posts: 14
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Battery not charging
I could use some help solving a puzzle. (a puzzle for me at least!) with the engine running i'm showing a slight discharge that doesn't change even with a higher rpm-- the problem just appeared and i'm not sure where to start. Suggestions ?
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12-23-2021, 06:06 PM | #2 |
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Join Date: Jan 2012
Location: Western North Carolina
Posts: 3,897
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Re: Battery not charging
Have you tried adjusting the charging rate by moving the third brush down? The third brush is the only one that rotates around the axis of the generator. It controls the charging rate.
Another answer may be that the cutout, that sits on top of the generator, is not cutting in to allow the generator to connect to the battery. If it is the old style with points, then the points may need to be cleaned and polished up. If it is the new style that is electronic then it may need to be replaced. Measure the voltage with a multimeter at the generator side of the cutout to see if it is 7 volts or higher. If the cutout is bad do not run the generator for any length of time as the voltage can build up to the point where it can cause damage. Another possible answer is that the generator is bad. Normally they just need new brushes and the commutator shined up. Measure the voltage, as above, and if there is 6 or less volts then the generator is not generating. Move the third brush before assuming the generator is bad. After moving the third brush, observe the charging rate (or discharge) at a fast idle, about 1,200 rpm. Here are some links that may help: http://modelabasics.com/Cutout.htm https://www.mafca.com/downloads/Semi...ex%20Janke.pdf https://www.youtube.com/watch?v=r_GR3jseCkk
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A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. Last edited by nkaminar; 12-23-2021 at 06:29 PM. |
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12-23-2021, 07:35 PM | #3 |
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Join Date: May 2010
Location: Hancock, New Hampshire
Posts: 375
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Re: Battery not charging
Try bypassing the cut out with a clip lead after the engine is running, check the ammeter to see if it’s charging.
If the generator is new or rebuilt it may need to be energized (I forget the more common term). Others will fill in the simple details that escape me right now. Must be pre-Christmas stress syndrome. Merry Christmas everyone. |
12-23-2021, 07:50 PM | #4 |
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Join Date: Jun 2014
Location: Land of Lincoln
Posts: 3,130
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Re: Battery not charging
Maybe the generator has become disconnected from the battery, cut out, blown fuse, bad wiring connections.
Don’t operate for very long or you can burn up the generator, the generator can produce about 40 volts in a uncontrolled condition!
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12-24-2021, 12:02 AM | #5 |
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Join Date: Feb 2021
Location: Troutman, NC
Posts: 717
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Re: Battery not charging
Could it be you have a bad battery? How old is it? Have you had it tested?
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12-24-2021, 11:30 AM | #6 |
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Join Date: May 2010
Location: Hancock, New Hampshire
Posts: 375
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Re: Battery not charging
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https://www.fordbarn.com/forum/showthread.php?t=40198 |
12-24-2021, 11:42 AM | #7 | |
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Join Date: Dec 2017
Location: Guthrie, OK
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Re: Battery not charging
Quote:
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12-24-2021, 11:47 AM | #8 |
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Join Date: Jul 2018
Location: Dallas, TX, Angola, IN
Posts: 157
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Re: Battery not charging
"Flashing the Field" is common terminology for polarizing a generator.
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12-24-2021, 01:27 PM | #9 |
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Join Date: May 2010
Location: Portland OR
Posts: 6,340
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Re: Battery not charging
Start with the basics, check the generator output with a meter, motor running. Then check the battery side of the cutout, do you see battery voltage there? The battery side is hot all the time.
Calling it "Flashing the field" or "Polarizing", could be a regional or industry thing, with many just saying polarize. You are flashing the field to polarize the generator. In any case, it is done to recharge the magnetic field after rebuild, sometimes if needed, or change the position of the poles if you were to change the ground from positive to negative or the reverse.
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12-24-2021, 02:57 PM | #10 |
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Join Date: May 2010
Location: Largo Florida
Posts: 7,225
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Re: Battery not charging
Another check of the generator is to see if it will motor. Just loosen the belt, apply power to the generator and see if it motors. If it spins [slowly] then 99% of the time its fine.
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