I have a S650 that will only crank for 1 sec and then quits and all lights go out on the instrument cluster when cold outside. It is plugged in and all battery cables are clean and in good shape. I can go through the start sequence again with the same result. Anybody have any ideas?
I would perform a legit test of the battery, first. I would not not trust it no matter if it’s only six months old or Uncle Hank said it was fine.