The message to which you are about to reply is shown first. GO TO REPLY FORM



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

How much voltage needed to start? S80

posted by  Dan in VT on  Thu Jun 29 06:15 CST 2023
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS] [RELATED]

2005 s80 2.5T AWD, 176k.

I've got a minor mystery on my hands. This car is driven by my teenage son. On Tuesday the car was dead, no electrical power at all. I'm pretty sure he left his bluetooth adapter, which plugs into the 12v slot, plugged in. He's "just not sure," LOL.

Before jumping it I measured 12.5v at the battery. Seemed a little low to me... high 12s would be better/normal, yes? It jump started very easily. With the engine running and no loads, I got 13.5 at the battery. That seemed a little low too.

I took the car, drove it that afternoon and all day Wednesday. Many miles, many starts. Then car is starting and running fine. Today (Thursday), I again tested the voltage at the battery before starting it. Only 12.4! But then the car started easily.

So...12.5v, totally, completely, utterly dead. 12.4v, two days later, it starts right up.

FWIW I now measure 13.9 at the battery with the engine running, no loads. Turned on the blower and lights, voltage stayed at 13.9.


Thoughts on this?






USERNAME
Use "claim to be" below if you don't want to log in.
PASSWORD
I don't have an account. Sign me up.
CLAIM TO BE
Use only if you don't want to login (post anonymously).
ENTER CAPTCHA CODE
This is required for posting anonymously.
OPTIONS notify by email
Available only to user accounts.
SUBJECT
MODEL/YEAR
MESSAGE

DICTIONARY
LABEL(S) +
IMAGE URL *
[IMAGE LIBRARY (UPLOAD/SELECT)]

* = Field is optional.

+ = Enter space delimited labels for this post. An example entry: 240 muffler


©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.