My Volvo S80 will not start it sounds like it should roll over, what should i do?

Robert C

Rookie
This happened before and I had it tested but when they went to test it it started right up. The dealership said they thought it was because I had done a lot of little trips earlier that day so it threw off the computer, but not the next time. This time it sounded like it should roll over, then the interior lights dimmed and made a different sound making me think that it was the battery, so i changed it. The same thing occured, so i don't think it is the battery and i am hoping it isnt the alternator, please help me i dont want to spend a lot of money.
 
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