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How much voltage needed to start? S80

posted by  Dan in VT on  Thu Jun 29 06:15 CST 2023
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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?






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New How much voltage needed to start? [S80]
posted by  Dan in VT  on Thu Jun 29 06:15 CST 2023 >


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