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EFV-8 Club Forum / 1940 Ford Discussion / Charging Problems:

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Posted By Discussion Topic: Charging Problems: -- page: 1 2

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fortyford
05-27-2022 @ 3:47 AM
Member
Posts: 205
Joined: Nov 2009
          
For some reason I think I have charging issues on my 40.At idle i am getting about 6.24 at battery.At a much higher RPM say 1500 to 2000 I still am getting around 6.20 to 6.30 at battery.I was thinking I should get around at least say 7.00 or more at high RPM?I have new wiring,regulator and I had generator checked and they said it was good?What else is there to check?i am not getting a reading in the green on my battery gauge either at say 60 mph?

trjford8
05-27-2022 @ 7:56 AM
Senior
Posts: 4179
Joined: Oct 2009
          
Make sure all your grounds are good and clean. Especially the one from the firewall to the motor.

JayChicago
05-27-2022 @ 8:20 AM
Member
Posts: 459
Joined: Jan 2016
          
You are correct, at higher RPM should be about 7.2 volt.

I have read that a new, out-of-the-box, voltage regulator may or may not provide an accurate charging voltage. It may need to be adjusted. That is best done by an electrical shop with experience and proper gauges.

Edit: re-reading your post, you said at higher RPM measured 6.2-6.3 volt. That is just battery voltage. Sounds like it is not charging at all. That could be a bad regulator. But I'm quickly getting over my head now, so wait for replies from others with more knowledge. Best advice will come from Professor TomO.

This message was edited by JayChicago on 5-27-22 @ 8:31 AM

fortyford
05-27-2022 @ 9:52 AM
Member
Posts: 205
Joined: Nov 2009
          
Jay,I stand corrected.I am seeing around 6.40 to no more than 6.50 at very high RPM at battery.

fortyford
05-27-2022 @ 5:03 PM
Member
Posts: 205
Joined: Nov 2009
          
I had another good generator and switched out and I believe it is just as bad or worse.At very high RPM I am not getting but around 6.24 to 6.32.seems to be not charging at all.Now I have fully charged battery with a charger,does this have anything to do with not charging when car is running.What I am saying is battery has a totally full charge on it now?I think it is pretty clear I have a regulator problem?

This message was edited by fortyford on 5-28-22 @ 5:23 AM

fortyford
05-30-2022 @ 5:14 AM
Member
Posts: 205
Joined: Nov 2009
          
I tryed this.Is this good or bad to do this.Problem is I went a little to far because my battery gauge at 60 MPH is showing at the red mark?I figured this is not good!
https://www.youtube.com/watch?v=MBHtXMTNUXA

TomO
05-30-2022 @ 9:14 AM
Senior
Posts: 7234
Joined: Oct 2009
          
Do not try to adjust the voltage on your voltage regulator yourself. You need preclusion instruments to do this job.

I think that your problem is caused by corrosion on the contact points of the cutout in the regulator.

Try: Connect your voltmeter to the BAT terminal of the voltage regulator, increase the rpm to about 1200 rpm and read the voltage. It should be around 7V.

If it is not, try connecting a jumper between field terminal and the armature terminal for a short while while reading the meter. Do not leave the jumper connected more than 1 minute or you can fry your generator. If it is around 7V your cutout points need cleaning.

Disconnect the battery, take the cover off of the voltage regulator and try spraying an electrical cleaner on the contacts of the cutout (the relay at the BAT terminal). Reconnect the battery and repeat the first test to see if that cured your problem. If not, disconnect the battery and use a fine (320 or F) emery paper. Fold a thin strip in half so that there is grit on both sides and draw it through the contacts. This should clean any corrosion off of the contacts.

Put the cover back on the regulator and reconnect the battery. Start the car and check the voltage. If it is not around 7V, find a generator repair shop near you and bring the generator and regulator there to have it checked out.

Tom

fortyford
05-30-2022 @ 11:28 AM
Member
Posts: 205
Joined: Nov 2009
          
Thanks ,Tom.this has been a long going issue with this car ever since I had it.I don't think I have ever seen say over 7 at high idle.I t just always seems like just charging enough to keep up!I checked like you said at voltage regulator high idle and I am only getting around 6.40?Dang maybe I have two generators bad?I do have an extra ground wire run from generator to regulator mount screw,is this OK?I cranked my old 52 truck up and at high idle I am seeing 7.50 at battery/I have never seen that on my 40?

TomO
05-31-2022 @ 6:52 AM
Senior
Posts: 7234
Joined: Oct 2009
          
The cutout relay should pick between 6.5V-7.0V from the generator. This usually happens above 1,000rpm.

Having a grounding wire from the generator case to the mounting of the regulator will not hurt anything.

Tom

37RAGTOPMAN
05-31-2022 @ 6:59 AM
Senior
Posts: 1931
Joined: Oct 2009
          
did you
polarize the regulator ?
to test the charging system. you could disconnect the regulator,
use a meter , one lead to the ARM terminal and one to ground,
now with engine running ground the field terminal for a split second and see if it charges higher,
if it does you have a regulator problem, or other issues,
never go by the dash gauge, buy a good meter, for testing
if it does not you have a generator problem
how are the brushes in the gen, are they arcing, ? short, dirty , comuntator corroded,
hope this helps, lease supply more information,, which helps us to diagnose
hope this helps, 37 Ragtopman

if you were to take the fan belt off you could motorize the generator, to see if the generator spins
[ TAKE CARE ] BECAREFULL,,,
take a lead from the battery to the arm terminal, use a heavy jumper lead, 10 gauge or more,
if it turns slowly the generator need to be cleaned or rebuilt, if it spins fast it sould be ok,

if you were to send both items to CERTIFIED AUTO in OHIO, they will check and repair,
and set it up to charge correctlly ask JEFF ot EARL
440 439 1100

This message was edited by 37RAGTOPMAN on 10-1-22 @ 10:09 AM

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