The Ford Barn

redfor40 · 12-28-2015, 02:06 PM

put a gm alt on a 49 to 53 ford can not get battery to charge had alt check by two diff shops checks good any help appreciated

deuce_roadster · 12-28-2015, 02:14 PM

Need more info. 6v alt or 12, internally regulated or externally regulated, is stock regulator still in circuit? etc etc.

redfor40 · 12-28-2015, 02:24 PM

alt is a gm 1 wire 12 volt int reg no stock regulator thanks

V8 Bob · 12-28-2015, 02:54 PM

What is the actual voltage output on your car? It should be very close to 14.4 V. Your battery may also be defective and not able to take a charge.

51 MERC-CT · 12-28-2015, 02:54 PM

What are you using to tell you that it's not charging as required?
As stated use a volt meter across the battery. If you are seeing appox. 13.5 volts or better , it's charging.
My stock ammeter in the car most of the time shows little movement but the alt. has always charged the battery.

redfor40 · 12-28-2015, 03:05 PM

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i put a volt meter on the battery and shows 12 volt go from alt to battery and still only get 12 volt

Ed Pitts · 12-28-2015, 03:06 PM

The one wire requires that you rev up your engine to get the charge going. One of the advantages of the three wire is you do not have to rev the engine.

redfor40 · 12-28-2015, 03:08 PM

they tell me it should show about 14.4 if the alt is right . volt meter on bat 12.0 volts on alt to battery still 212 volts

CaliforniaBorn36 · 12-28-2015, 03:14 PM

Read through the following thread, it may answer many of your questions. As stated above, the one wire requires the engine to reach a certain RPM before it will begin to charge.

http://www.fordbarn.com/forum/showthread.php?t=185370

JSeery · 12-28-2015, 05:23 PM

This could be due to the fact that it's a 1-wire setup or it could be wired wrong. Not sure I understand how the alternator can check out good (which I assume means it is outputting around 14+ volts) at two shops and has near zero output on the car. Sure sounds like a wiring or battery issue. At what engine RPM are you checking the battery voltage? I would check it around 2000 RPM and see what the output is. If still nothing, I would guess that there has to be a wiring problem somewhere.

51 MERC-CT · 12-28-2015, 05:47 PM

Your one wire from the alt. should go to/thru the ammeter then to the battery side of the solenoid.

redfor40 · 12-28-2015, 10:46 PM

Thanks I will look at wiring tomorrow

flatheadmurre · 12-29-2015, 03:32 AM

You have the ground at the right pole on the battery ??
Try to excite the generator when running if its reving to low to selfexcite it will start charging after that.

12-28-2015, 02:06 PM	#1
redfor40 Senior Member Join Date: May 2010 Location: indiana Posts: 99	charging system put a gm alt on a 49 to 53 ford can not get battery to charge had alt check by two diff shops checks good any help appreciated

12-28-2015, 02:14 PM	#2
deuce_roadster Senior Member Join Date: Oct 2011 Location: Shelton, WA Posts: 3,799	Re: charging system Need more info. 6v alt or 12, internally regulated or externally regulated, is stock regulator still in circuit? etc etc.

12-28-2015, 02:24 PM	#3
redfor40 Senior Member Join Date: May 2010 Location: indiana Posts: 99	Re: charging system alt is a gm 1 wire 12 volt int reg no stock regulator thanks

12-28-2015, 02:54 PM	#4
V8 Bob Senior Member Join Date: May 2010 Location: Granger (Northern) Indiana Posts: 1,520	Re: charging system What is the actual voltage output on your car? It should be very close to 14.4 V. Your battery may also be defective and not able to take a charge.

12-28-2015, 02:54 PM	#5
51 MERC-CT Senior Member Join Date: May 2010 Location: East Hartford, Ct Posts: 5,898	Re: charging system What are you using to tell you that it's not charging as required? As stated use a volt meter across the battery. If you are seeing appox. 13.5 volts or better , it's charging. My stock ammeter in the car most of the time shows little movement but the alt. has always charged the battery. __________________ DON'T RECALL DOING SOMETHING FOR MYSELF BASED ON SOMEONE ELSE'S LIKES OR DISLIKES

12-28-2015, 03:05 PM	#6
redfor40 Senior Member Join Date: May 2010 Location: indiana Posts: 99	Re: charging system Sponsored Links (Register now to hide all advertisements) i put a volt meter on the battery and shows 12 volt go from alt to battery and still only get 12 volt

12-28-2015, 03:06 PM	#7
Ed Pitts Senior Member Join Date: May 2010 Location: Irving, Texas Posts: 598	Re: charging system The one wire requires that you rev up your engine to get the charge going. One of the advantages of the three wire is you do not have to rev the engine.

12-28-2015, 03:08 PM	#8
redfor40 Senior Member Join Date: May 2010 Location: indiana Posts: 99	Re: charging system they tell me it should show about 14.4 if the alt is right . volt meter on bat 12.0 volts on alt to battery still 212 volts

12-28-2015, 03:14 PM	#9
CaliforniaBorn36 Senior Member Join Date: Oct 2012 Location: San Francisco Bay Area Posts: 427	Re: charging system Read through the following thread, it may answer many of your questions. As stated above, the one wire requires the engine to reach a certain RPM before it will begin to charge. http://www.fordbarn.com/forum/showthread.php?t=185370

12-28-2015, 05:23 PM	#10
JSeery Member Emeritus Join Date: Nov 2012 Location: Wichita KS Posts: 16,132	Re: charging system This could be due to the fact that it's a 1-wire setup or it could be wired wrong. Not sure I understand how the alternator can check out good (which I assume means it is outputting around 14+ volts) at two shops and has near zero output on the car. Sure sounds like a wiring or battery issue. At what engine RPM are you checking the battery voltage? I would check it around 2000 RPM and see what the output is. If still nothing, I would guess that there has to be a wiring problem somewhere.

12-28-2015, 05:47 PM	#11
51 MERC-CT Senior Member Join Date: May 2010 Location: East Hartford, Ct Posts: 5,898	Re: charging system Your one wire from the alt. should go to/thru the ammeter then to the battery side of the solenoid. __________________ DON'T RECALL DOING SOMETHING FOR MYSELF BASED ON SOMEONE ELSE'S LIKES OR DISLIKES

12-28-2015, 10:46 PM	#12
redfor40 Senior Member Join Date: May 2010 Location: indiana Posts: 99	Re: charging system Thanks I will look at wiring tomorrow

12-29-2015, 03:32 AM	#13
flatheadmurre Senior Member Join Date: Apr 2015 Location: Sweden Posts: 3,045	Re: charging system You have the ground at the right pole on the battery ?? Try to excite the generator when running if its reving to low to selfexcite it will start charging after that.