No, the wrong type of oil within the engine should have no effect on the alternator operation.
However, IF in the process of putting oil in the engine someone were to spill some of the oil onto the alternator, AND IF some of that oil got into the alternator it could cause damage to the alternator.
I don't think of anything in comon between the two. If you have a check engine light, take it to autozone and have the codes read. I would change the fuel filter to see if maybe that happened at the same toime. Possibly have the wrong alternator pulley or belt is installed wrong. Can cause a short between the alternator and the frame.
Battery is completely discharged or is defective. loose alternator wiring or bad alternator.
I would check your alternator*(check the spelling).
If your engine does not turn off by the key I suggest disconnecting the battery and alternator and immediately fixing what is wrong
Your alternator maybe bad
ABSOLUTELY. CHANGE THE TIME BELT WHEN NEEDED. NOT WORTH THE CHANCE, of DESTROYING THE ENGINE. WRONG, WRONG, WRONG. NON interference. wrong information is worse than no information at all
Usually a sighn of bad alternator.
Never disconnect a battery while an engine is running!
Check the alternator if that don't do it change the battery
If it was rebuilt wrong, Yes
Inside the alternator
Due to the layout of the cd20 in a Serena it is not uncommon for the alternator too run at high temperatures. However the alternators that were fitted originally were capable of dealing with the required heat stresses. As long as the alternator is a good quality one it is normal. These engines do use alternator belts quickly so that is not unnusual. hope this helps.