i tried putting batteries in my jet ski that seem to be full but obviously are dead..... could it be something malfunctioning internally all the connections are tight......

 

dont know what kind of battery exactly it is but did you check the fluid levels of it?? but then again it might not be that kind of battery

 

Did you Charge the Battires before you installed them? My buddie put in a new Battery in his Quad before Charging it and it wouldn't work. just an Idea

 

How long has your ski been sitting and do the display lights on the dash come on? my GSX sat all winter and when i put a new battery the display came on, but my starter had frozen up so when i tapped it with a screw driver it fired right up.