I/O trim button question

[Leoragusa]

Hey guys.. i just picked up a mint 2003 320 with twin 496 mags.. my question is..

on the helm to the left of the steering wheel are 3 switches.. i know the first two are the left and right trim but there is a 3rd switch.. i dont know what that is b/c the markings are rubbed off.. anyone know what its for?

 

[Bt Doctur]

most likely "trailer" for both drives that I remove and install a switch for each drive to raise to trailer position

 

[Leoragusa]

i c.. i thought maybe that switch raised and lowered both drives at the same time.

 

[Bt Doctur]

raised maybe , the trim button would lower them