2008 sx210 will not crank

[RyanD83]

Hey just joined the forum because my post in a Facebook post wasn't getting a lot of responses. I recently purchased a 2008 sx210. I did general maintenance to it, oil change, rebuild cleaning ports, metal scupper valve and replaced a lot of rusted hose clamps. I took the boat out to make sure everything was running good and it performed awesome. At the end of the ride I went to power it up on the trailer and went to turn the key and got a crank for a half a second on one engine and then nothing and nothing on the other. After that, there has been nothing. I turn the key and it gives the three beeps and the gauges all work. Batteries are fully charged as well. The clean out hatch switched were bypassed by previous owner but I went ahead and re did it. I also replaced the negative terminal and wire wheeled all the connections. I thought maybe the switch on the lanyard went bad so I jumped both connections and also tried leaving both open and still nothing. I tried moving the throttles while turning the key and again nothing. I'm at a loss. Whatever it is, it is causing both engines at the same time to not crank. I can't find a fuse box anywhere on this damn thing either. I don't see it being an ignition switch, starter, or relay as it isn't likely both would go at the same time. PLEASE HELP

 

[Neutron]

First you need a service manual for your boat. It will show where your fuse locations and possible causes and testing procedures.
The lanyard ony stops fuel, the hatch switches will stop the crank. And since the previous owner bypassed them i would start there.
You might have a bad ground or bad connection somewhere