Go Back   The Ford Barn > General Discussion > Model A (1928-31)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 10-20-2020, 10:11 AM   #1
duffy
Junior Member
 
Join Date: Oct 2020
Posts: 6
Default Generator Charging

When my '31 slant windshield is at idle the Ammeter is at zero. When I raise engine speed it goes to 10 and even 20 amps charging. When I move center brush up or down idle amps do not change, reads zero. Is my gauge bad? Could i have wires reversed on brushes? Gen motors when wires jumped.
duffy is offline   Reply With Quote
Old 10-20-2020, 10:35 AM   #2
31Tudor
Senior Member
 
31Tudor's Avatar
 
Join Date: May 2010
Location: North Carolina
Posts: 440
Default Re: Generator Charging

You mention "idle amps". At idle, the generator cut out has opened and broken the contact, so you do not get any charging showing at idle. You would adjust your charging rate at a higher RPM, when the cut out closes again, moving the brush as you mentioned.
31Tudor is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 10-20-2020, 11:34 AM   #3
Kurt in NJ
Senior Member
 
Kurt in NJ's Avatar
 
Join Date: May 2010
Location: on the Littlefield
Posts: 5,280
Default Re: Generator Charging

If you were to read the instruction manual you would see that the car should not show a charge at idle or with the headlights on
Kurt in NJ is offline   Reply With Quote
Old 10-20-2020, 12:05 PM   #4
Patrick L.
Senior Member
 
Patrick L.'s Avatar
 
Join Date: May 2010
Location: Upstate NY and western Florida
Posts: 5,945
Default Re: Generator Charging

You failed to mention the fast idle charging rate after adjusting the third brush. Set it to a few amps if you drive mostly during the day, a little higher for at night. It really shouldn't be set for more than 10 amps.
Patrick L. is offline   Reply With Quote
Old 10-20-2020, 01:37 PM   #5
duffy
Junior Member
 
Join Date: Oct 2020
Posts: 6
Default Re: Generator Charging

Good info. Thank you. Will try again at fast idle.
duffy is offline   Reply With Quote
Old 10-20-2020, 05:59 PM   #6
duffy
Junior Member
 
Join Date: Oct 2020
Posts: 6
Default Re: Generator Charging

Sponsored Links (Register now to hide all advertisements)
OK, I increased the idle and set charging rate to around 8 amps. However, if I speed up engine the meter climbs and can go as high as 20 amps. Is this normal?
duffy is offline   Reply With Quote
Old 10-20-2020, 07:01 PM   #7
Patrick L.
Senior Member
 
Patrick L.'s Avatar
 
Join Date: May 2010
Location: Upstate NY and western Florida
Posts: 5,945
Default Re: Generator Charging

No, its not normal. When I say fast idle I mean around in the 1000-1500 RPM range.
The charge rate should not go that high.
Patrick L. is offline   Reply With Quote
Old 10-20-2020, 08:26 PM   #8
Curt phillips
Junior Member
 
Join Date: Sep 2020
Posts: 3
Default Re: Generator Charging

Where should the needle be at normal driving speed with the lights on?
Curt phillips is offline   Reply With Quote
Old 10-20-2020, 09:02 PM   #9
J Franklin
Senior Member
 
J Franklin's Avatar
 
Join Date: May 2010
Location: oregon
Posts: 4,399
Default Re: Generator Charging

At or below 0
J Franklin is offline   Reply With Quote
Old 10-20-2020, 10:51 PM   #10
bobbader
Member
 
Join Date: May 2010
Location: Huntington, NY
Posts: 47
Default Re: Generator Charging

Duffy, Sounds like you may be getting confused about how to set the third brush and you might need to start over. A good rule of thumb is to determine a starting point from which to adjust the brush in either direction. I always start by looking into the open slots in the rear of the generator and setting the third brush so that it looks to be equally distant in between the two other brushes. After doing so, get in the car, start it, and fully advance the spark lever. At idle, the ammeter may read zero or maybe about 2 amps at the most. Do not be concerned by this. Now, rev up the engine with the accelerator pedal. The ammeter should really go no higher than about 8 amps with the engine revved up. If it is higher or lower than that, now you have a starting point from which to move the third brush, in small increments, in either direction ............ toward the engine side of the generator for less charge .............. toward the fender side of the generator for more charge. Remember ........... SMALL INCREMENTS .............. until you get it to where it puts out no more than 8 amps with the engine revved up. If at any time during the adjustments you see a major spike in the charging rate, it might be time for closer inspection and repair of the generator itself. It may take several attempts to get the adjustment correct. Be patient. But, start with a reference point you can always go back and start over should you get flustered or frustrated. Good Luck, Bob Bader
bobbader is offline   Reply With Quote
Old 10-21-2020, 08:02 AM   #11
Pat/Ohio
Senior Member
 
Pat/Ohio's Avatar
 
Join Date: May 2010
Location: Wilmington, OH/Lakeland, FL
Posts: 814
Default Re: Generator Charging

Quote:
Originally Posted by duffy View Post
OK, I increased the idle and set charging rate to around 8 amps. However, if I speed up engine the meter climbs and can go as high as 20 amps. Is this normal?
Duffy, I believe there might be a little confusion here. Increase the idle with your foot on the accelerator not adjusting the idle speed at the carb. When you increase your revs (with your foot or by pulling on the carb. linkage), your amps shouldn't register over 8 amps. It is common to register at 0 or a little below when idling. You shouldn't register 8 amps when idling.

Pat
Pat/Ohio is offline   Reply With Quote
Old 10-21-2020, 10:12 AM   #12
Purdy Swoft
Senior Member
 
Purdy Swoft's Avatar
 
Join Date: May 2010
Location: Alabama
Posts: 8,070
Default Re: Generator Charging

I use the Fun Projects voltage regulator . I adjust the third brush for a ten amp maximum charge . The voltage regulator controls the amount of charge up to that point . The regulator takes the place of the cut out and prevents the generator from overcharging the battery and boiling the acid . Before installing the voltage regulator I would turn on the head lamps to reduce the charge rate when I would smell the acid boiling .
Purdy Swoft is offline   Reply With Quote
Old 10-21-2020, 06:00 PM   #13
Big hammer
Senior Member
 
Join Date: Jun 2014
Location: Land of Lincoln
Posts: 2,133
Default Re: Generator Charging

Duffy.......what shape is your battery in, water level, terminals ?
__________________
Don't force it with a little hammer tap, tap, tap
get a bigger hammer tap done
Big hammer is offline   Reply With Quote
Old 10-21-2020, 07:40 PM   #14
Gene F
Senior Member
 
Join Date: Mar 2012
Location: Ohio
Posts: 223
Default Re: Generator Charging

If ya drive your car daily 0 is good. For us occasional drivers 1 amp with the lights off seems to be the sweet spot. Of course I do have a hand crank though...
Gene F is offline   Reply With Quote
Old 10-22-2020, 10:35 AM   #15
Patrick L.
Senior Member
 
Patrick L.'s Avatar
 
Join Date: May 2010
Location: Upstate NY and western Florida
Posts: 5,945
Default Re: Generator Charging

If you can't set the output low enough [ 2-4 amps lights off at fast idle/ slow cruise speed] then I'd recommend checking voltage output. These generators can produce 20+ volts if there is a poor connection/ground somewhere. Or, there can also be a generator problem.
Patrick L. is offline   Reply With Quote
Old 10-22-2020, 11:01 AM   #16
Purdy Swoft
Senior Member
 
Purdy Swoft's Avatar
 
Join Date: May 2010
Location: Alabama
Posts: 8,070
Default Re: Generator Charging

If the fields are connected backwards , the generator will still charge but moving the third adjustable brush will have no effect on the charging rate .
Purdy Swoft is offline   Reply With Quote
Old 10-23-2020, 10:37 AM   #17
Badpuppy
Senior Member
 
Join Date: Dec 2017
Location: Guthrie, OK
Posts: 714
Default Re: Generator Charging

1931 should have the coil connected directly to the generator at the firewall so the ammeter reads only battery current. The ammeter will read 0 until the cutout closes, after which you should expect >6 amps to replenish the battery after starting but should drop to 1 amp or so after a minute or two. A weak (shorted cell) battery won't charge to full voltage and will keep drawing a higher current and heat up. You may need a new battery.

Last edited by Badpuppy; 10-24-2020 at 09:31 AM. Reason: correction
Badpuppy is offline   Reply With Quote
Old 10-23-2020, 02:14 PM   #18
Patrick L.
Senior Member
 
Patrick L.'s Avatar
 
Join Date: May 2010
Location: Upstate NY and western Florida
Posts: 5,945
Default Re: Generator Charging

Charge rate shouldn't change with an original cut-out. If a regulator is installed then it will change.
Patrick L. is offline   Reply With Quote
Old 10-24-2020, 09:41 AM   #19
Badpuppy
Senior Member
 
Join Date: Dec 2017
Location: Guthrie, OK
Posts: 714
Default Re: Generator Charging

Quote:
Originally Posted by Patrick L. View Post
Charge rate shouldn't change with an original cut-out. If a regulator is installed then it will change.
? -
Charge rate (current) varies with voltage, which varies with generator rpm.
Regulator limits voltage to a given level.
Badpuppy is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 02:40 PM.