What is this plug for?

[xcursiontri]

I have this plug behind my seat - have no idea what it is for, any ideas?

 

[aspeck]

Do you have lights on top of your roof/cover? When you put the top up you would need to plug them in … that would be my guess.

 

[Fun Times]

Pontoon boat?
Maybe the Bimini top navigation anchor light plug.

 

[Scott Danforth]

if one of the wires is grey, then its for the white light on top the bimini

 

[stylesabu]

sure looks like rear white light plug. test light and flip dash switches see if test light lights up,also if front lights dont show/red/green, may have blown fuse