Login Register

Alternator Troubleshooting Topic is solved

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive P2 platform cars sold as model years 2001-2007 (North American market year designations).

2001 - 2007 V70
2001 - 2004 V70 XC (Cross Country)
2004 - 2007 XC70 (Cross Country)
2001 - 2009 S60
2003 - 2007 S60 R
2004 - 2007 V70 R
Post Reply
User avatar
br0dy519
Posts: 746
Joined: 17 December 2019
Year and Model: 2004 XC70
Location: Windsor, ON
Has thanked: 126 times
Been thanked: 116 times

Alternator Troubleshooting

Post by br0dy519 »

Hi all,

Just wondering what the agreed method to alternator troubleshooting is. While driving yesterday the battery light went on, with a "EL.POWERSYSTEM SERVICE REQUIRED" message on the info center display. When I got to my destination I left the car running and slapped the multimeter on the battery and got a read of 11.6V ! (Very low brownout) Car off- 12.6V (actually an OK reading for an idle battery). My first thought is the alternator itself, and likely going for a rebuild to make sure I have a new pulley/fresh bearings from a reputable local rebuilder. I plan on taking the alternator off and using this thread viewtopic.php?f=9&t=51058 to troubleshoot and see if the regulator is the issue as well... but I think while I'm in there I really should just replace the whole alternator anyway in order to ensure I have new mechanical parts. Battery is only about a year old Kirkland H7 so I really don't think it's that although I will get it load tested while my alternator is on the bench getting tested as well.

Am I on the right path or not? This is part of an ongoing rough patch I've been having with the 04 xc70 in the past month (First exhaust leak, discovered that I needed ball joints, after replacing ball joints ABS light comes on and I had to replace my rear wheel bearing this weekend... now alternator? :( Hopefully this is the end of my bad luck streak for the year!)
04s60 2.4
04xc70 2.5t
prwood wrote:I wish I had a permanent car repair area that was covered, had a level surface, lighting and fans, a workbench, and tool cabinets. You know,like a garage. Much of my time during the job is spent hauling things up and down the stairs to the basement or in and out of the storage shed, or running back downstairs when I realize I need something else,or taking a break from standing out in the sun,or using flashlights or work lamps when it gets dark.
Top
User avatar
Blacklab467
Posts: 1107
Joined: 9 August 2016
Year and Model: 2007 xc 70
Location: Calgary, AB
Has thanked: 114 times
Been thanked: 262 times

Post by Blacklab467 »

I just had that problem in my '03. Test the alternator voltage at the B+ terminal on the back of the alternator, you can reach it with a multimeter probe. Should be 14 - 14.5.
I would replace with an OEM unit either new or from an autowrecker depending on your budget. Don't buy an aftermarket part and expect it to work for long. It's pretty east to change, look up a video on YouTube.
2003 XC 70 (sold)
2007 XC 70, 1970 Dodge Charger R/T.
Top
xHeart
Posts: 3306
Joined: 3 December 2011
Year and Model: 2.0/3.2
Location: Great Lakes - USA
Has thanked: 113 times
Been thanked: 115 times

Post by xHeart »

Failing or failed pulley will result in malfunctioning regulator.
Replace both, but use new Bosch dual passive heat exchanger for replacement.
Image

This may help viewtopic.php?f=9&t=96765
Last edited by xHeart on 20 Apr 2021, 14:29, edited 1 time in total.
--
Golden-German Shepherd | 2021 XC90 T6 INSCRIPTION (Nexa) | 2020 V60CC (Frska) | 2013A XC90 (Lktra)
Past: Golden Retriever | 2001 V70XC | 1997 Volvo 854 | 1989 Volvo 740 GL | 1979 Volvo 240
Top
User avatar
br0dy519
Posts: 746
Joined: 17 December 2019
Year and Model: 2004 XC70
Location: Windsor, ON
Has thanked: 126 times
Been thanked: 116 times

Post by br0dy519 »

Blacklab467 wrote: ↑20 Apr 2021, 14:05 I just had that problem in my '03. Test the alternator voltage at the B+ terminal on the back of the alternator, you can reach it with a multimeter probe. Should be 14 - 14.5.
I would replace with an OEM unit either new or from an autowrecker depending on your budget. Don't buy an aftermarket part and expect it to work for long. It's pretty east to change, look up a video on YouTube.
ok I'll check between b+ and ground with the car running. shouldn't be much different than the battery reading no?

and no I'm not getting any chinese alternator. I'm getting a rebuilt Bosch one from a good rebuilder here in town (only uses japanese bearings)
04s60 2.4
04xc70 2.5t
prwood wrote:I wish I had a permanent car repair area that was covered, had a level surface, lighting and fans, a workbench, and tool cabinets. You know,like a garage. Much of my time during the job is spent hauling things up and down the stairs to the basement or in and out of the storage shed, or running back downstairs when I realize I need something else,or taking a break from standing out in the sun,or using flashlights or work lamps when it gets dark.
Top
User avatar
oragex
Posts: 5347
Joined: 24 May 2013
Year and Model: S60 2003
Location: Canada
Has thanked: 102 times
Been thanked: 352 times
Contact:
Contact oragex
..

Post by oragex »

Normally, when you get the battery light it's actually the regulator that failed.
A faulty alternator regulator (or faulty clutch pulley) will damage the battery.
A worn battery (may still crank fine) will damage an alternator regulator
It's all interconnected
After you put a new regulator, drive and see if the battery is in good health
Be sure to put the correct regulator number - it has changed in 2004 so read the number you have in your car
For the ABS light, if you ever pull on the wire to remove an ABS sensor, it goes kaput, always push with a flat screw driver from under the sensor


Top
User avatar
br0dy519
Posts: 746
Joined: 17 December 2019
Year and Model: 2004 XC70
Location: Windsor, ON
Has thanked: 126 times
Been thanked: 116 times

Post by br0dy519 »

oragex wrote: ↑20 Apr 2021, 17:12 Normally, when you get the battery light it's actually the regulator that failed.
A faulty alternator regulator (or faulty clutch pulley) will damage the battery.
A worn battery (may still crank fine) will damage an alternator regulator
It's all interconnected
After you put a new regulator, drive and see if the battery is in good health
Be sure to put the correct regulator number - it has changed in 2004 so read the number you have in your car
For the ABS light, if you ever pull on the wire to remove an ABS sensor, it goes kaput, always push with a flat screw driver from under the sensor


It all is definitely connected, that's why I want to replace the entire alternator instead of throwing a $100 regulator at it then having to rebuild the alt anyway after the fact. As for the battery I will have it load tested- again it's a year old and I have seen defective batteries or it may be damaged by the reg, the load test will verify that and I'll get a new one if need be. I find that more accurate than using a multimeter anyways. The regulator number this document helped me quite a bit with selection https://regitar.com/image/file_download ... Choose.pdf

ABS light was solved already replaced the wheel bearing but yes it's good practice to always use the harness and never pull on loose wires as sometimes those little clips break or come loose inside of plugs. 3rd ABS light in past 2 years by the way.... waiting on when I'm gonna have to put the last wheel bearing in after replacing both tone rings up front lol
04s60 2.4
04xc70 2.5t
prwood wrote:I wish I had a permanent car repair area that was covered, had a level surface, lighting and fans, a workbench, and tool cabinets. You know,like a garage. Much of my time during the job is spent hauling things up and down the stairs to the basement or in and out of the storage shed, or running back downstairs when I realize I need something else,or taking a break from standing out in the sun,or using flashlights or work lamps when it gets dark.
Top
User avatar
br0dy519
Posts: 746
Joined: 17 December 2019
Year and Model: 2004 XC70
Location: Windsor, ON
Has thanked: 126 times
Been thanked: 116 times

Post by br0dy519 »

Just an update. The alternator was DEAD. On the bench the pulley sounded like a pig getting slaughtered. Output voltage was 11V.

Battery slapped on charger and has great capacity. So after three hours I slapped the alternator in and all is well. I hate this job on the turbo :)
04s60 2.4
04xc70 2.5t
prwood wrote:I wish I had a permanent car repair area that was covered, had a level surface, lighting and fans, a workbench, and tool cabinets. You know,like a garage. Much of my time during the job is spent hauling things up and down the stairs to the basement or in and out of the storage shed, or running back downstairs when I realize I need something else,or taking a break from standing out in the sun,or using flashlights or work lamps when it gets dark.
Top
User avatar
oragex
Posts: 5347
Joined: 24 May 2013
Year and Model: S60 2003
Location: Canada
Has thanked: 102 times
Been thanked: 352 times
Contact:
Contact oragex
..

Post by oragex »

Good fix. The alt comes out rather fine by removing the radiator fan assembly and sliding the alt by the radiator and pulling it out near the air filter box
Top
User avatar
br0dy519
Posts: 746
Joined: 17 December 2019
Year and Model: 2004 XC70
Location: Windsor, ON
Has thanked: 126 times
Been thanked: 116 times

Post by br0dy519 »

Well I come crawling back here asking more opinions and advice. I'm getting a great ~14.4 while car is driving; however, the "EL. POWERSYSTEM REQUIRED" message with the battery light appears for about a single half second flash immediately after turning over. Battery is just shy of 12.3 volts when the engine isn't running. I think I'm going to replace the battery this week and will report back.
Last edited by br0dy519 on 10 May 2021, 14:25, edited 1 time in total.
04s60 2.4
04xc70 2.5t
prwood wrote:I wish I had a permanent car repair area that was covered, had a level surface, lighting and fans, a workbench, and tool cabinets. You know,like a garage. Much of my time during the job is spent hauling things up and down the stairs to the basement or in and out of the storage shed, or running back downstairs when I realize I need something else,or taking a break from standing out in the sun,or using flashlights or work lamps when it gets dark.
Top
User avatar
abscate
MVS Moderator
Posts: 35278
Joined: 17 February 2013
Year and Model: 99: V70s S70s,05 V70
Location: Port Jefferson Long Island NY
Has thanked: 1500 times
Been thanked: 3812 times

Post by abscate »

It’s dead , Jim

Mark me as another one of the suckers allured in by the cheap price of the aftermarket voltage regulator which lasted three months.

FCP Bosch, baby, or don’t bother
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 XC90-in-Red
Link to Maintenance record thread
Top
Post Reply
  • Similar Topics
    Replies
    Views
    Last post

Return to “S60, V70, V70-XC 2001-07”