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""""I'm pretty sure you shouldn't disconnect a battery with the engine running and the alternator operating because of possible voltage and current spikes which could fry the electronics.""""
yes indeed, that is a not a good thing to do. In fact you are warned against doing it by Volvo -- I think it's written as a Warning somewhere in the Bentley Bible.
Short story, I had a dying battery, but driving on the highway had been charging it enough to start the engine.
I drove the car on a trip several hundred miles, stopped for gas and Fully Dead. Rolled it popped the clutch and drove it to a buy a new battery.
The "mechanic" at the Battery store wouldn't believe me when I told him that my battery was just old and that's why it died. He insisted on "testing" it.
The car was stll running as I never shut it off after jumping it. The "Tech" used his volt meter and then said he wanted to disconnect the battery while the car was running to see if the Alt was good or bad.
I told him DO NOT DO THAT, you will fry my ECU...he said I do this all the time... Not on my car you don't. If you won't just sell me a new battery, I'm going somewhere else. That pissed him off.
They reluctantly sold me a new battery, gripping...well when it dies it's on you because YOU wouldn't let us TEST the charging system.
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