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Adjusting Alternator Voltage #4734213
04/21/18 01:48 PM
04/21/18 01:48 PM
Joined: May 2005
Posts: 2,214
Toronto, Canada
George7941 Offline OP
George7941  Offline OP
Joined: May 2005
Posts: 2,214
Toronto, Canada
https://www.aspwholesale.com/voltage-regulator-dr-p9020.html
This is for a 22SI alternator. The page I linked shows a voltage regulator with twinned terminals. If you check the Specifications, it shows that the setpoint voltage can be changed by cutting the web between the twin terminals. Anyone know how that works?


2006 GMC Sierra 4.3l, NV3500,G80 , Mobil 1 5W30, Dexcool.
1987 BMW R80 - sold
2015 Honda CBR300R

Staying out of the right lane a lot.
Re: Adjusting Alternator Voltage [Re: George7941] #4734283
04/21/18 02:36 PM
04/21/18 02:36 PM
Joined: Dec 2016
Posts: 6,436
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,436
Waco, TX
Originally Posted By: George7941
it shows that the setpoint voltage can be changed by cutting the web between the twin terminals. Anyone know how that works?


I can only assume if your batteries are located far from the alternator, by the time voltage gets to them it has dropped a fair bit. Maybe cutting the tie bar ups the setting another +.5 volts or so?


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Adjusting Alternator Voltage [Re: George7941] #4734340
04/21/18 03:24 PM
04/21/18 03:24 PM
Joined: May 2005
Posts: 2,214
Toronto, Canada
George7941 Offline OP
George7941  Offline OP
Joined: May 2005
Posts: 2,214
Toronto, Canada
That is what it looks like but I cannot find any info online. The only way to find out for sure, I suppose, is for me to cut the web out and see how much the voltage changes. This is a one wire alternator setup with just the B+ connection, no sense or excite or ignition voltage connection


2006 GMC Sierra 4.3l, NV3500,G80 , Mobil 1 5W30, Dexcool.
1987 BMW R80 - sold
2015 Honda CBR300R

Staying out of the right lane a lot.
Re: Adjusting Alternator Voltage [Re: George7941] #4734372
04/21/18 03:55 PM
04/21/18 03:55 PM
Joined: Oct 2010
Posts: 1,774
california
wrcsixeight Offline
wrcsixeight  Offline
Joined: Oct 2010
Posts: 1,774
california
If this desired voltage modification is intended to better recharge distant depleted batteries over a thick copper circuit, be aware you should not Idle parked to recharge for more than 10 minutes or so as the alternator can easily heat upto the 220F danger zone.

I can spin a dial and choose any voltage I want, and if maxing out the alternator at idle its stator will raise above 170F in 5 minutes and is still heating quickly. Sub 25MPH driving does not do much either in regards to keeping stator temperature down, but 65MPH freeway driving it will not rise above 132F when maxed out, or nearly so.

I had to trick my engine computer with a 50 watt 10 ohm resistor into thinking it was still connected to the alternator, and I use a Transpo540HD external regulator. It has a potentiometer for voltage adjustment. I snipped the pot's legs and added wires and a larger 10 turn potentiometer so I can easily change the voltage while underway.

About 2/3 more amperage will flow into a battery at 14.7v compared to 13.6v, so it is a very worthwhile modification when one is regularly deeply cycling batteries and wanting to take advantage of a rather large amperage potential charging source.

I've put a digital ammeter on my dash, next to the voltmeters and find it enjoyable to watch amp flow into the battery change with different electrical pressure( voltage) reaching battery terminals.

The battery(s) dictates how many amps it accepts at the voltage reaching the terminals, so in the case of recharging deep cycle batteries an alternator with external regulation is much more desirable than one meant to simply replenish what a starter battery requires, as most vehicles will quickly lower voltage to the Mid 13's so as to not induce overcharging or excessive water usage. Vehicle Voltage regulation was never designed for fastest recharging of depleted batteries, and 80% charged to 100% charged, basically takes no less than 3.5 hours, and this is at ideal voltages reaching battery terminals.

Re: Adjusting Alternator Voltage [Re: wrcsixeight] #4734439
04/21/18 04:53 PM
04/21/18 04:53 PM
Joined: Dec 2016
Posts: 6,436
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,436
Waco, TX
Originally Posted By: wrcsixeight
.... I can easily change the voltage while underway.

About 2/3 more amperage will flow into a battery at 14.7v compared to 13.6v, so it is a very worthwhile modification when one is regularly deeply cycling batteries and wanting to take advantage of a rather large amperage potential charging source.


Sounds like you either live off-grid, or do a lot of RV'ing


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Adjusting Alternator Voltage [Re: George7941] #4736121
04/23/18 11:04 AM
04/23/18 11:04 AM
Joined: Feb 2007
Posts: 3,670
Southeast
meep Offline
meep  Offline
Joined: Feb 2007
Posts: 3,670
Southeast
^^^ yeah whats the background story?


2018 F150
2015 crv (wifey!)
Re: Adjusting Alternator Voltage [Re: George7941] #4736356
04/23/18 03:45 PM
04/23/18 03:45 PM
Joined: May 2005
Posts: 2,214
Toronto, Canada
George7941 Offline OP
George7941  Offline OP
Joined: May 2005
Posts: 2,214
Toronto, Canada
I don't know wrcsixeight's back story but he has posted frequently on the subject of battery charging and he, more than any other Bitoger, likes to ensure his batteries are charged as close to 100% as humanly possible. He is very knowledgeable on AGM batteries and optimum charging methods for them.


2006 GMC Sierra 4.3l, NV3500,G80 , Mobil 1 5W30, Dexcool.
1987 BMW R80 - sold
2015 Honda CBR300R

Staying out of the right lane a lot.
Re: Adjusting Alternator Voltage [Re: George7941] #4750751
05/08/18 01:05 AM
05/08/18 01:05 AM
Joined: Nov 2007
Posts: 3,996
United States of America
mjoekingz28 Offline
mjoekingz28  Offline
Joined: Nov 2007
Posts: 3,996
United States of America
Thanks again wrxsixeight for putting the foreign/unknowns of electrical into sttaightforward knowledge that is both interesting, helpful, and easy to read and understand.

Re: Adjusting Alternator Voltage [Re: George7941] #4754715
05/12/18 01:55 AM
05/12/18 01:55 AM
Joined: Aug 2006
Posts: 9,838
Central Washington
Colt45ws Offline
Colt45ws  Offline
Joined: Aug 2006
Posts: 9,838
Central Washington
What I did on my 2002 CVPI was put a Schottky diode inline to the Voltage sense pin of the alternator. A Schottky will drop about .3V. Raised hot idle voltage from 14.2 to 14.5.
First I tried it out with a standard 1N4007 diode since I have a ton on hand. Dropped about .6V and hot idled at 14.8.
I decided that was a little much, so I ordered in the Schottky. Ended up exactly where I wanted it.


-Colton
2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 75k
Castrol EDGE HM 5W30, Fram XG2

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