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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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Re: upgrade charging system?

Post by xHeart » Wed Dec 25, 2019 11:02 am

After checking the connectors, the alternator output under load hovers at 13.56v. The voltage drop test with B+ is 0.28, while voltage drop at battery negative (-) terminal is 0.06, both at 1500-2000 rpm.

Alternator charging never goes above 13.60v.
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misha
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Re: upgrade charging system?

Post by misha » Wed Dec 25, 2019 12:03 pm

Did you measure directly on alternator or on battery terminals?
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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Re: upgrade charging system?

Post by xHeart » Wed Dec 25, 2019 12:18 pm

The set up for voltage drop test using multimeter, and then increasing rpm to 1500-2000:
Black probe at negative (-) battery terminal while red probe at the alternator casing, it reads 0.06v.
Red probe at positive (+) battery terminal while black probe at the B+ post at alternator, it reads 0.28v.
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Re: upgrade charging system?

Post by misha » Wed Dec 25, 2019 3:39 pm

Check output directly on the alternator while engine is idling.
Red probe on b+ on alternator and black on it's housing.
You should get 14-14.2v at idle.
If not...voltage regulator or alternator are faulty.
If you do....b+cable needs to be replaced because the voltage doesn't get to the battery.

Voltage drop needs to be checked after driving the car for at least 30min and without turning the engine off prior to voltage drop testing.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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Re: upgrade charging system?

Post by jimmy57 » Thu Dec 26, 2019 6:26 am

The 120 amp alternator from 960 is also a choice for more charging power.

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abscate

Re: upgrade charging system?

Post by abscate » Thu Dec 26, 2019 7:30 am

That’s a big drop on the B+

Do you have an IR gauge you can check the temperature of the cable after 15 minutes running with all the lights on ?
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Re: upgrade charging system?

Post by xHeart » Thu Dec 26, 2019 9:35 am

misha wrote:
Wed Dec 25, 2019 3:39 pm
Check output directly on the alternator while engine is idling.
Red probe on b+ on alternator and black on it's housing.
You should get 14-14.2v at idle.
If not...voltage regulator or alternator are faulty.
If you do....b+cable needs to be replaced because the voltage doesn't get to the battery.

Voltage drop needs to be checked after driving the car for at least 30min and without turning the engine off prior to voltage drop testing.
Cold start and idle reads/hovers 14.08-14.12v with your set up misha. So cable?
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Golden Retriever | 2014D VIDA DiCE | 2013A XC90 +144mi/231km | 2001 V70XC 1st Owner +196mi/ +315km | 1997 Volvo 850 NA 1st Owner +180mi/ +289km
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misha
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Re: upgrade charging system?

Post by misha » Thu Dec 26, 2019 12:05 pm

Yep!
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

xHeart
Posts: 2581
Joined: Sat Dec 03, 2011 8:05 am
Year and Model: 13XC90/01V70X/97N854
Location: Great Lakes - USA
Has thanked: 18 times
Been thanked: 33 times
United States of America
xHeart

Re: upgrade charging system?

Post by xHeart » Thu Dec 26, 2019 12:18 pm

misha wrote:
Thu Dec 26, 2019 12:05 pm
Yep!
Just positive (red cable) or negative cable too?
--
Golden Retriever | 2014D VIDA DiCE | 2013A XC90 +144mi/231km | 2001 V70XC 1st Owner +196mi/ +315km | 1997 Volvo 850 NA 1st Owner +180mi/ +289km
Past: German Shepherd | 1989 Volvo 740 GL | 1979 Volvo 240

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misha
Posts: 4144
Joined: Sun Dec 07, 2008 4:09 pm
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Re: upgrade charging system?

Post by misha » Thu Dec 26, 2019 3:48 pm

Usually the part from positive battery terminal to starter is the one which fails.
In your case you should replace the negative too.
Replacement MUST be the same thickness as original or slightly thicker...but DO NOT replace it with thinner cable.
25mm2 is EU spec....i guess that this is equal with 2awg(U.S)but check the conversion table.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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