Gray86hatch

iTrader: (83)

Never had issues. Dad drives the car all the time and I only put a charger on it a couple times over the winter. Not even sure how many years it has been 4-5. His car has ac stereo dual electric fans.

Tim

-TheBandit-

iTrader: (1)

Thank you for the reply Tim!

It seems this alternator functions like a 1 one alternator if nothing is connected to the other two pins.

For others jumping into this thread, there is a description of how this system operates below:
http://acdelcotechconnect.com/pdf/imtn_V12I305.pdf

Gray86hatch

iTrader: (83)

Yes it charges at 13.6-8 vs 14.1-3 for a true 1 wire.

Tim

5.7stroker

iTrader: (36)

Bump

So still no way to get a 2 pin DR244 alt from a 2007+ truck to charge higher than 13.8v in a 4th gen camaro? The 4th gen can handle a 4 pin, AD244 145a alt no problem, but if you try to use the 2 pin DR244, there is no way to have it charge at it's full 14.3v capacity? Did I read this correctly?

TORK?

iTrader: (27)

You can either hardwire it which is the constant 13.x (but I think that defaults it to 100% duty cycle @ that voltage), or you should be able to throw on one of these and convert it to single wire. https://alternatorparts.com/dr44g-self-exciting-ad244-regulator-conversion-faq.html

5.7stroker

iTrader: (36)

Thanks, but I decided to just get the proper AD244.

cenexes12

If after all these years you are still working on this project I have an answer for your problem. You would need to purchase a PWM controller from amazon for like $8 bucks. The DR44G alternator requires a 5volt 128hz signal to put out anything over 13.6 to 13.8 volts. you can power the PWM module with a 5volt + current from a USB plug and set your duty cycle to 70% at 128hz for an output voltage of 14.37volts

Here's the secret why GM puts it in later model cars. The computer can command the alternator to put out any voltage from 11V to 15.5V.
Before the late model engine is started, and also after its shut off, GM can check the condition of your battery. Then they can decide how to charge it and they command the alternator to put out the voltage needed to maintain the battery. Also, the alternator tells the computer if it's having trouble putting out the voltage that the computer commanded. To help the alternator, the computer might raise the idle speed for example.

The L pin is the command voltage pin. A 5V PWM signal is sent from the ECM/BCM at a frequency of 128hz. If the duty cycle is less than 10% or more than 90% or just plain not connected, the alternator will go into default mode and put out about 13.7 volts. Enough to keep your car running, but not enough to charge the battery well. Here are the voltages and duty cycles:
10% = 11.0 V
20% = 11.56 V
30% = 12.12 V
40% = 12.68 V
50% = 13.25 V
60% = 13.81 V
70% = 14.37 V
80% = 14.94 V
90% = 15.5 V

The F terminal is also a PWM signal. But it's put out by the alternator and read by the computer. The lower the duty cycle the easier the alternator is working. If you want to use the alternator and aren't connected to the correct ECM/BCM then you don't need to connect the F terminal.

Escalade6.0

I have a 03 escalade I have a 3 wire color tan, brown, and blue and my alternator has
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chrisakers63

I am having issues with charging on a 2007 suburban 5.3 . I have put a new alternator & new fuse but still no output, ran voltage check on 2 wire plug at alternator light colored wire showed 5.0v & dark wire showed 6.2 . i have removed new alternator & had machine tested & showed good but when reinstalled & hooked up , it shows no charging. if anyone has any ideas it would be greatly appreciated