Re: 2001 gti sea doo
its a yellow/red wire. Find the connector under the steering assy, inside hull and test there, but i think thats not your problem. Locate the rear black ebox..(2-red cables leaving it). Those cables are attached to a relay. With good battery, jump the relay, to make sure your motor isnt seized and that the starter is good.
If so, then with button depressed, check the red cable terminal at relay for power leaving relay to starter. If not power, your relay is bad.
Whats the symptom/s the ski is doing?