Like the others, allow me to say welcome to the site. Always happy to see a new member. As to your (not) so crazy question, I'm going to go out on a limb here. You asked which switch in the picture is for the bilge pump. My (semi-educated) guess is that it's the one directly below the 12V cigarette lighter outlet. My reasoning is this: Most bilge pumps have 2 settings, manual and automatic. Plus most setups have a light to indicate when the pump is running. For that reason most bilge pump switches are independent of the rest of the switches for horn, lights, etc. The only switch configuration that seems to fit that bill is the one I mentioned. So that would be my guess.
See if the switch moves both up and down, and also see if that light next to it comes on in either direction.
The manual switch is for when you want to override the automatic for whatever reason.
The automatic position goes through a float switch located in the bilge near the bilge pump and turns the pump on or off depending on the level of water in the bilge.
And just remember that due to corrosion, broken wire, etc. even though you may have correctly identified the switch, the pump may not work.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
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