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The schematic is available at seadoomanuals.net in the 96 shop manual. The wire that runs from the 7.5A fuse only goes to power the VTS module. If you disconnected the power to the VTS module and the fuse still blows then the wire is going to the wrong place or it is damaged and touching...

To build on what etemplet has told you, the rev limiter is a function of the CDI module. I do not think there is a reliable way to test that unit except swapping it for a known good unit as he recommended. If you can't easily do that I would check a couple of things. The CDI has 2 connectors...

Use a schematic and make sure the MPEM is getting 12V and Ground.

Do the gauges light up if you just press the start button without the key? Do you get the 2 beeps or any other beep code when putting the key on the post? Did you check all the fuses in the rear electrical box and MPEM ? The wiring that goes into the hood is for the info center and sensors that...

Additionally, you can statically check any of the start relays out of the ski by applying 12V and ground to the base of the relay where the small yellow/red stripe and black wires connect. You should measure 0 ohms (short circuit) across the top 2 large connections on the relay when 12V is...

I think it would be worthwhile to check the ground connection (small black wire) at the base of the start solenoid (next to the yellow/red stripe wire. It runs to a bolt at the base of the ignition coil that has other ground wires on it. That bolt and the connectors on it tend to corrode and...

Do you get the full battery voltage on the top post of the start relay that runs directly to the starter when you press the start button and the start relay clicks?

I agree with your assessment that if the seller is refunding and letting you keep the MPEM and key then it probably might not be a working unit. I've seen Westside Powersports recommended a lot on this forum. They sell used parts and I believe they stand behind them. Call them and explain your...

The first question is where did you get the OEM MPEM and key from an how do you know it is working unit?

The schematic for your ski also shows a black battery cable running from the battery negative to that same connection point you are cleaning up. That cable is the main ground for the engine and starter.

There is a black ground wire that goes from the base of the solenoid to a bolt that is on the base of the ignition coil that has 4 black ground wires attached to it. Remove the bolt, clean it up and the clean all the connectors that go on it and reassemble it. Check with an ohmmeter that you...

what is voltage on the starter side of solenoid when start button pushed?

Try shorting across top of start solenoid to see if starter cranks. If not then suspect starter or cables/connections to it.

A multimeter tests with a very low current and might show close to 0 ohms. It would not show if the cable was internally deteriorated and will not pass the high current that the starter requires.

I think it would be worth it to remove that cable and temporarily replace it with a car jumper cable from the solenoid post to the starter positive post and see if you get the starter to crank the engine using the start button.

Also if the gas and oil are of unknown age or unknown oil type, drain them out (tanks and crankcase) and flush the tanks if dirty. Also change the oil filter.

If it has gray fuel lines then they need to be replaced, the carbs rebuilt with genuine mikuni kits following the sticky post at the beginning of this forum. Clean the fuel strainer. Change the jet pump oil and check the condition of the bearing, impeller and wear ring and pressure test it when...

While it probably is the starter, it would be worth charging and having the battery load tested before pulling and rebuilding the starter. If the starter is the OEM Seadoo then definately rebuild it instead of replacing it with aftermarket.

I guess it depends on the price with all the unknowns. Does the MPEM give the 2 beeps when the key is placed on (good sign but probably not all functions of the MPEM are checked)? Without the starter you can't check compression or tell is the trigger coil, MPEM, CDI and coil are producing spark...

if you see spark and put gas straight in then check compression as mentioned.