I don't think this is related at all to the alternator. Not only are they designed to get wet but even if it did fail, the alternator would not cause the engine to not start. It only provides voltage while the engine is running so it would not prevent it.
Just to be sure, your engine cranks but it does not start? You said it doesn't turn over but that typically means it will not crank. So, when you turn the key the engine spins but just doesn't fire and run?
If not, here is a guide that will get us started:
We need to find out if we have a fuel or spark issue that is preventing this from starting so let's start with checking fuel pressure and then pull a spark plug and hold it against the block and see if there is spark when you are cranking the engine.
Lastly while the plug is out, can you see what it looks like so we can find out if they are fouled? I attached a diagram of possible plugs issue.
Let us know what you find, and we can go from there. Thanks
Wednesday, October 13th, 2021 AT 4:53 PM