Volvo S70 Made from 1998 to 2000, this sporty model replaced the 850 sedan and instantly became a hit.

Alternator going bad?

Old 07-09-2018, 07:32 PM
Thread Starter
Join Date: Nov 2016
Location: Anchorage AK
Posts: 39
Default Alternator going bad?

My scangauge reads my voltage as between 13.2 and 13.7 while driving, and while running at idle, my multimeter shows 13.35-13.45 volts. The battery never seems to get above 12.4 volts even after long drives. My numbers are lower than they should be I think. How long do you think my alternator has before it quits?

Last edited by first477; 07-09-2018 at 07:33 PM. Reason: Communication
Old 07-09-2018, 09:49 PM
Senior Member
Join Date: May 2012
Location: Kingsport, TN
Posts: 1,472

Good enough. I would ignore it. The voltage regulator may go out, for sure, but I just wait until that happens and replace it.

Volvos have the smallest voltage regulator, and the brushes are built into it. Very clever. The brushes cut a groove in the armature, so the armature doesn't last for eternity, but it's pretty close to that.
Old 07-09-2018, 10:18 PM
Thread Starter
Join Date: Nov 2016
Location: Anchorage AK
Posts: 39

Iím going to get the voltage regulator, alternator and battery all replaced at the same time once it starts giving me trouble. I just hope that isnít for a while. The battery thatís currently in it has been drained completely twice because of a slow parasitic draw. (too weak to start after sitting 4 days) I have to figure out what the issue is and get that sorted out before I get all my charging system components replaced. I know all of this has been taxing my alternator. Iím trickle charging my battery right now, going to start pulling fuses and checking draw when I return from fairbanks.
Old 09-07-2018, 04:48 AM
Thread Starter
Join Date: Nov 2016
Location: Anchorage AK
Posts: 39

Got alternator replaced. Voltage now sits at 14.2. No battery drain. Problem solved.
Old 10-22-2018, 03:46 AM
Junior Member
Join Date: Sep 2015
Posts: 17

change it in car now before winter sets in and you are running heater all the time, alt does not need to be removed
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