100amp alternator upgrade, boat wont start now

We upgraded my 1995 super sport gt-40 with a 100 amp alternator kit from ski dim. I installed it Sunday evening and now the boat wont start. If followed the instructions to a tee, and i know i did nothing wrong. The boat is not getting fuel for some reason. I've downloaded the GT-40 manual on this website and we have gone through all the steps as far as diagnosing and whatnot. It seems everything checks out when testing each individual component, but when they all come together, its a mess.

Boat wont cycle fuel pumps for 2 secs when key is switched on. When we run a testlight on the wire at the relay it lights up for 2 secs and then shuts off like it should. When we run the diag connector to ground the fuel pumps run fine. we have tested the grounds to the ECM, they are fine. I'm looking for a complete wiring schematic of the engine ,i have some schematics of individual things, but would like to try and find a complete one if it exist.

The super sport has never given us any trouble in the past five years until now. I thought about taking the new alternator off and putting the old one back on, but knowing what i know , i cant see how it impacts anything with the fuel system. If you guys have any ideas, im open to them, i have checked the shut off lanyard switch, its fine.

Any help would be greatly appreciated, need to get back on the water, the kids are getting fussy

Thanks

Here is a good write up to check your fuel pump operation. Good luck. Just work through the diagrams/thread and you should figure it out.

lewy

It makes it easier if you follow the conversation between lewy and the original poster.

If you look at this traditional wiring schematic (and I'd think the GT-40 isn't all that different as far as this goes), the alternator wiring does include constant hot, ignition switched and ground wiring.

Any mistakes or problems here, and you have the opportunity to short the constant hot positive or ignition straight to ground. Which I'm thinking is maybe what's happening.

It's hard to interpret that kit just from looking at DIM's picture. Why is there extra wiring? I'm assuming it's not quite plug and play. Does it create a quick connect plug on the alternator side?

The GT40 manual in the reference section is your best friend.

Is there a fuseable link between the alt and the starter?