Alternator Questions
Hi, my charge light has lit up on the dash suggesting an alternator fault.
Before I take the plunge and buy a new one could someone kindly help me understand the following : My car is a 2004 V40 estate with, a 1.9 turbo diesel engine, gas discharge headlights and climate control. 1) Seems there are two types of alternator, one with A/C and one without A/C, my alternator only has two connections what does the with or without A/C actually mean ? 2) My alternator is a Valeo part number SG12B071 rated at 125 Amps, when I look for a replacement I find ones that are rated at 120 AMPS that say will fit my car. I am so confused, any help would be greatly appreciated. |
Alternators rarely work at full capacity so I doubt there'll be any issue with 120A versus 125A if the fitment is correct.
When I had charging issues, I found that my brushes were worn and near the end of their travel so I fitted a new brush pack/regulator for about £30. I have a Bosch alternator on my S60 and it was a very easy job but I don't know if that would be equally simple on yours. Worth checking though. |
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Clan I know A/C stands for air conditioning, mine actually has climate control where you dial in a temperature and the system adjusts to achieve that temperature.
My question was given that I only have two wires connected to the alternator what difference as far as the alternator goes whether it is classed as A/C or non A/C. Non A/c alternators are more expensive than A/C alternators, I would just like to know the difference between them. |
Cheshired5, yes I have taken the cover off the alternator but the brushes and commutator look to be in fairly good shape, which is leading me to believe there is another problem.
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the volvo part number you need for your 125A alternator is 8251641 |
Probably best to get some DC Volts readings measured from the alternator B+ post and AC Volts if you have an accurate enough True RMS meter.
Also check the DC voltage at the feed wire into the alternator and perhaps do a diode check with a multimeter too. You want more info than a dash charge warning light before you go fitting a replacement. |
Clan thanks for the reply and the Volvo part number, I have asked them for a price but I suspect it will be very expensive.
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cheshired5 I have tried to make some voltage readings as follows :
Engine off battery voltage 12.38 On tick over around 800rpm (with gas discharge headlights lit) voltage 11.69 At B+ terminal 11.62 At the small wire on alternator 1.26 Looks like the alternator is not putting out anywhere near the voltage it should. |
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