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Not cranking

I am brand new to owning jet skis by the way. My 1999 GTI will not crank over it will click and turn over once sometimes. The oil light is on and flashes/dims when I crank. I have a brand new cheap Walmart battery in it because I just bought it and the battery was dead. I have honestly had good experience with the cheap batteries and I don’t want to pay double the price if I don’t need to. I heard that these can be picky about the battery, the key, or the starter solenoid can be the problem but I don’t really know where to start. There is currently no gas or oil in it. The battery tested 12.5 volts. Let me know if you have and idea what’s going on. Is it hydrolocked with oil? (Previous thread)
 

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Go to auto parts store and have the battery load tested to verify it is good. Also, take out spark plugs , ground your wires and see if it cranks over easier, look for any fluid coming out of spark plug holes.
 
So I tried cranking it with no spark plugs and nothing really changed. I also charged the battery over night. No difference. I’m sure it’s got some oil in it because when I tried cranking it the first time oil shot out of the plug holes and stained my garage ceiling blue. I plug the key in and there’s two beeps, and then I press the button and it just clicks, sometimes turns over once. Doesn’t sound great, but maybe that’s normal. I guess I could go test the battery at auto zone. Should I try a new battery or could something else be the problem?
 
It sounds like there is a problem with the starter or the start solenoid. Check the starter by shorting across the solenoid. If it cranks reliably then test the start solenoid has zero resistance across the top contacts when energized. If not replace the solenoid. Otherwise load test the battery.
 
Oh man check this out. The trailer lights weren’t working and the inside of them looked just like this. The box was really hard to move around and get a good look at. Haven’t tried jumping solenoid yet. How do I clean this.IMG_0081.jpeg
 
There are products available for rust removal. I have not used them myself. You could also use a soft wire drush to open and clean the connections. Hopefully the moisture did not internally damage the electrical components.
 
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