Bad Alternator?

Post by **Biggertuna** » 09 May 2021, 15:15

Hi everyone - I have an issue with my '03 V70 NA (180K miles) that I'm hoping is just the alternator.
While driving today, A/C shutoff, speedometer stopped working, and both ABS and battery lights illuminated on the dash. After 20 seconds, A/C came back, ABS light shutoff, speedometer started to work, but battery light stayed illuminated. Message on the dash read: "EL. Powersystem, Service Required".

Recently replaced the battery about 3 months ago (previous was 7 years old and started to smell like sulphur). OBD shows no fault codes and quick battery test showed ~12.5 V on the battery after starting. Belt and tensioner look ok as well (both replaced about 5 months ago).

This all leads me to believe it's the alternator (which is the original). Is there anything else I should check before starting this replacement?
Thanks in advance.

Post by **Blacklab467** » 09 May 2021, 15:30

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. Remove the radiator fan and pull it out the top.

Post by **Biggertuna** » 13 May 2021, 09:43

Multimeter came back with a reading of 11.97V from the B+ terminal. Bad alternator indeed.

Post by **oragex** » 13 May 2021, 11:24

Yes, if that's voltage with the engine running it means the alternator does not charge and you are only reading battery voltage. Be sure to get your correct regulator number, look up on youtube and Fcpeuro

Post by **Biggertuna** » 13 May 2021, 12:17

Correct, that was the reading with the engine running.

Contacted FCPEuro since I could only find the voltage regulator model (8676498) on my alternator.
Based on my VIN, my vehicle requires the140A (36050262) alternator

Georgeandkira · Post by **Georgeandkira** » 13 May 2021, 14:32

FYI: I didn't need to remove the fan to get my '02's alternator out. It was straightforward and relatively easy.

A local rebuilder fixed me up.