IPD sale Volvo Parts
XeMODeX - Experts in Volvo Electronics My Swedish Parts ad - genuine Volvo parts
Did you know? 🤔
Logged in users can get email notification of topic replies Log in or register (free).
Amazon Link Buy your stuff using this and it helps MVS!

Correct alternator voltage

Help, Advice, Owners' Discussion and DIY Tutorials on the third generation Volvo V70 wagon and XC70 crossover, and second generation S80. Are you an owner? Prospective owner? Get in here and join us! Start a new topic or comment on an existing thread.

2008-2016 V70
2008-2016 XC70
2007-2016 S80

headrc
Posts: 26
Joined: Sun Jul 13, 2014 10:13 am
Year and Model: 1998 v70xc
Location: Tennessee
Has thanked: 3 times
Been thanked: 0
headrc

Correct alternator voltage

Post by headrc » Fri Nov 17, 2017 10:45 pm

I continue to attack alternator problem. I swapped the regulator and now my alternator is putting out 14.8 volts with a load on it. Is this correct or is the battery being overcharged? It is a 2012 Volvo XC70 7.3 with the 180 amp alternator.



User avatar
RickHaleParker
Posts: 2827
Joined: Mon May 25, 2015 2:30 pm
Year and Model: See Signature below.
Location: Kansas
Has thanked: 3 times
Been thanked: 312 times
United States of America
RickHaleParker

Re: Correct alternator voltage

Post by RickHaleParker » Sat Nov 18, 2017 12:27 am

14.7 is considered to be the maximum charging voltage. I would not worry about the extra 0.1V, it is most likely measurement error in the voltage meter.


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

headrc
Posts: 26
Joined: Sun Jul 13, 2014 10:13 am
Year and Model: 1998 v70xc
Location: Tennessee
Has thanked: 3 times
Been thanked: 0
headrc

Re: Correct alternator voltage

Post by headrc » Sat Nov 18, 2017 8:11 am

Ok, Thanks. My concern is I had it tested at two of the local stores ...both Advanced and Oreilly's and they both said it was bad and overcharging. But I put my volt meter on it and get 14.8 volts. We are about to take a long Thanksgiving trip and don't want end up ruining the battery.



User avatar
RickHaleParker
Posts: 2827
Joined: Mon May 25, 2015 2:30 pm
Year and Model: See Signature below.
Location: Kansas
Has thanked: 3 times
Been thanked: 312 times
United States of America
RickHaleParker

Re: Correct alternator voltage

Post by RickHaleParker » Sat Nov 18, 2017 2:32 pm

The voltage should drop as the battery charges. 14.7 is the peak charging voltage, it should not stay that high for long. If it does not come down there is something wrong. Check your volt meter against another to be sure it not your meter. Have the battery checked also.


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

headrc
Posts: 26
Joined: Sun Jul 13, 2014 10:13 am
Year and Model: 1998 v70xc
Location: Tennessee
Has thanked: 3 times
Been thanked: 0
headrc

Re: Correct alternator voltage

Post by headrc » Sat Nov 18, 2017 5:34 pm

Thanks Rick. I had had the battery checked ...as well as checked it myself. It is fine. I did try another voltmeter and now I am getting 14.6 to 14.73 so I am a little more comfortable with what I have. Although this does not say a lot about having the chain parts stores tests.



Post Reply