So I take it with the bilge fan and adapter, you have to cut the plug off the adapter and splice the wires together?
I didn't want to reply because i haven't gotten this working yet, but yes, that's what I have been doing. I use butt connectors to splice the lines together. However, as you can see from my posts above, I'm having a hard time getting a power supply that works with the fan. I'll probably just get the one recommended earlier in this post, even though I wanted to get a 9V charger.