Wrong battery cable on post. No beeps nothing.

[Angie]

Only found one fuse and changed it. New battery still nothing. Put new starter solenoid on still nothing! ‍

 

[greenhornet2]

maybe a post or key issue. I would check connectors first for corrosion. What year make model? This is in the sea doo spark section

 

[mikidymac]

Typically this fries the MPEM computer when the cables are hooked up backwards. This would also explain why it is completely dead.

 

[TimJCarrow]

Only found one fuse and changed it. New battery still nothing. Put new starter solenoid on still nothing! ‍

You may also want to check starter motor and the key. If you hear clicking when you are trying to start it, the problem is 99% in the starter relay.