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upgrade charging system?

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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shegarty
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upgrade charging system?

Post by shegarty » Wed Nov 20, 2019 9:30 am

Hi folks, I just installed a new subwoofer to help with low end bass. It was nothing outrageous (a single 12" 300W rms unit) but I am concerned that I might be stressing the charging system. At higher power levels the lights (headlights and dash) dim slightly. Alternator is still putting out about 13.7V during this time (13.8/9V otherwise). Should I be looking at upgrading the alternator or wiring? What options are available?


current - 98 S70 T5 SE (255k km)
previous - 90 745T (400k km - sold); 94 855 T5 - (206k km - blown timing idler bearing)

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abscate
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Re: upgrade charging system?

Post by abscate » Wed Nov 20, 2019 9:39 am

There were both 80 Amp and 100 Amp options for the 1998 year - check and see which one you have to see if the easy upgrade path is there for you.

About $200 plus core of $100 and you need to bring your pulley over to the new one, too.


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shegarty
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Re: upgrade charging system?

Post by shegarty » Wed Nov 20, 2019 10:03 am

abscate wrote:
Wed Nov 20, 2019 9:39 am
There were both 80 Amp and 100 Amp options for the 1998 year - check and see which one you have to see if the easy upgrade path is there for you.
Am I looking for specific markings on the alternator itself?


current - 98 S70 T5 SE (255k km)
previous - 90 745T (400k km - sold); 94 855 T5 - (206k km - blown timing idler bearing)

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abscate
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abscate

Re: upgrade charging system?

Post by abscate » Thu Nov 21, 2019 7:25 am

The output is usually labelled on the voltage regulator - I think you can see it with a mirror and light without removing anything,


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1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
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Re: upgrade charging system?

Post by misha » Thu Nov 21, 2019 3:19 pm

With 100A alternator you don't need an upgrade.
I don't think that you would need an upgrade even with 80A one.


'97 850 2.5 20v /fully equipped/ Motronic 4.4 / polar white wagon
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98RedV70GLT
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98RedV70GLT

Re: upgrade charging system?

Post by 98RedV70GLT » Fri Nov 22, 2019 1:34 am

Get a capacitor.


98 V70 GLT
90 Q45

shegarty
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shegarty

Re: upgrade charging system?

Post by shegarty » Wed Dec 04, 2019 7:11 am

Looks like I have the 100A version. I am thinking that it might be worthwhile to check connections and clean them up, maybe upgrade the wiring when it warms up a bit. I have also noticed a dip in dash lighting when the malfunctioning SAS tries to engage as well as when the A/C compressor kicks on. Hopefully its not a sign of the alternator or regulator on its way out as this has been happening now for 5+ years.


current - 98 S70 T5 SE (255k km)
previous - 90 745T (400k km - sold); 94 855 T5 - (206k km - blown timing idler bearing)

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