Kawasaki Jet Skis - Engine turns over but never ignites...

I have a 2000 Kawasaki 900 Jet Ski. The engine turns over but never ignites. I've changed the s..

I have a 2000 Kawasaki 900 Jet Ski. The engine turns over but never ignites. I've changed the spark plugs and added ethanol treatment to the gas. It does not appear to have spark. Any ideas?
Also, is there a problem if you charge the battery inside the jetski or do you need remove the battery from the hull? Thanks.

follow the red wire from your battery to the elcetrical box(has a bunch of wires going to it). Open the box up and see if you have any corrosion/water in there. Als ocheck your fuses.

What do I do if there is corrosion in the box? Can I fix it myself or do I need a mechanic to repair?

No you should be able to repair it yout self. You will need to take all conectors loose and clean them

What were your thoughts about the 2nd question on charging the battery inside or outside of the ski?

You can use a trickle charger with the battery inside the hull.