I'm running a 6 volt generator on a pos. ground system. I was afraid the old cut out was over charging the battery. I replaced the old cut out with a new NUREX semi-conductor cut out. At regular idle the amp meter shows about 5-6 amps of charge. Running down the road- 40mph it shows around 12 amps charge. No lights on. What is the correct charge rate? Maybe the old cut out wasn't bad after all as these charge rates are about the same as before.
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The cutout is simply an OFF-ON switch, and in no way controls the generator output. This is true whether it's the original style or the diode style. Mr. Regan makes an EVR that fits in the cutout and controls the generator output. There is also an EVR built into the generator band, and I make an EVR that fits inside the generator and replaces the adjustable third brush.
If you stick with the stock generator, then I'd move the adjustable brush UP to lower the output to only a couple amps. -
Smit
The cut out does NOT control the charging rate, as it is just basically an on & off switch. The third brush which is adjustable controls the output. I like to double check the amp meter using an external meter when doing the adjustment. I usually set them for regular day time driving at a few amps. In our technical forum Tom posted this genny tutorial
here is the link:::
3~ Tudor's & 1~ Coupe
Henry Ford said,
"It's all nuts and bolts"
"Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."
Mitch's Auto Service ctrComment
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If the old cutout allowed the generator to recharge the battery and taper off after it was topped off, then it was working fine. If it continued to show a 12amp charge after a half hour of driving and charging, the third brush on the generator is set too high. The charge rate has little to do with the cutout working as that is just a switch. You may not have needed to buy a new cutout, you may have needed to just adjust the charge rate with the third brush.You wana look waaay far up da road and plan yer route because the brakes are far more of a suggestion than a command!Comment
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I moved the 3rd brush up and now the amp meter reads about 3 to 4 amps at idle and around 10 at high idle. I hit the light switch at high idle and the amp meter dropped to around 1 amp. I have a funny feeling there was nothing wrong with the old cut out. Thanks everyone!Comment
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10 amps is a good setting for night driving, but it's high for daytime driving, and will boil out the water much quicker than necessary.Comment
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What Tom said your still a little high
when it's set right for day driving the lights will make it go negative
like i said before i always verify with an external meter -
back in the day the owners would change the brush setting for day or night driving. If you seldom drive at night, just set it to about 2-4 amps at high idle and forget it
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How far will that 3rd brush move? I thought I had it set fairly high on the armature.Comment
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Smit
Why not just install an EVR as mentioned and you'll never have to screw around with the 3rd brush. You'll have the best of both worlds day and night driving at the proper charging rate.3~ Tudor's & 1~ Coupe
Henry Ford said,
"It's all nuts and bolts"
"Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."
Mitch's Auto Service ctrComment
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I was helping a guy get his A started today. Shorted ignition switch. After it ran the ampmeter showed no charge. Would show discharge with lights on. The output of the generator post was the same as the output side of the cutout. 6.1 v. At idle or revved up. Does this indicate the generator is not putting out. Will the output stud of the generator show an output before the cutout closes? Tia
...07-21-2019, 03:43 AM -
I wanted to share an experience with the no output issue I had with the generator that has a stock cutout. The ammeter needle was not showing a charge. Referencing some ideas from this forum I tried jumping the cutout while increasing rpm's to rule out a bad cutout, but no improvement. Then tried motoring the generator. The generator motored just fine. What I eventually found was the generator output...04-02-2022, 09:15 PM -
This is the generator that was on the car when I received it in 1993. It has performed well, and I am trying to determine its origin. It has the oilers at both ends and two wires coming from the grommeted hole where the stud to the cutout is usually found. One of the wires is connected to the cutout, the other is a ground to the one of the cutout screws. The pulley is two piece, riveted together,...03-25-2019, 04:52 PM -
Generator puts out 18 amps driving speed. Third brush adjustment makes no difference. Discovered third brush wire shredded and disconnected. Soldered on new wire, new bearing, new brushes, same results. Third brush all the way up and still a study 18 amps driving speed. What could the problem?08-11-2021, 11:45 PM -
Generator Brushes and Adjustment and How It Works.
By :: Tom Wesenberg
I'm asked quite often about brush adjustment and how they work, so hopefully these pictures will help.
The first picture is a cutaway taken at the Model A museum at Gilmore Auto Museum in Hickory Corners, Michigan. The second picture shows the 3 brushes. This happens to be the style...You do not have permission to view this gallery.
This gallery has 2 photos.05-19-2017, 09:51 PM -
I’ve read a lot of posts on this, but the procedure still isn’t completely clear to me.
I’ve just disassembled a generator to re-wrap the field coils with Scotch glass electrical tape, and then cleaned and re-assembled it.
It will motor with my 6 volt 10 amp battery charger attached to it - negative to output post and positive to generator case.
If I connect...12-15-2020, 06:07 PM -
Let's start the story at the start. One of the first things I did when I got my car about a year ago. Was open up, cleanup and moderately refurbish the generator. Made sure all the coils were clean, cleaned and polished the commutator, the brushes were still decent. After this the generator was running great. Even in the winter when my battery was having a tough time.
now move to a week...10-02-2022, 06:33 PM -
If a person wanted to change their car back as it would have been originally, with a generator, what would you have to do to make it correct? We have a new alternator now on the car & have access to a couple generators. Thanks...08-06-2019, 02:57 PM -
I just got the coupe back on the road after a long spell in the garage for various repairs. Among other things, I installed a new wiring harness, new headlight sockets, new LED headlight bulbs, and a rebuilt generator with the TomW EVR. I've immediately noticed two problems.
First, the generator is not charging the battery. I'm unable to get the ammeter to move into the "charge"...10-31-2021, 06:29 PM -
Can I run a generator with Pertronics ignition that has a diode cutout ? I know the power to the electronic ignition comes from the battery and the diode cutout keep the voltage even keel,so I don't see a problem but want expert advice.05-05-2019, 07:38 AM
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