I have been all through my trim tab system due to a problem with it not showing on the VDIG and the wire will be spliced together inside the hull. Mine was on the starboard side near the front of the engine compartment. I have an installation guide that I aquired when trying to fix my problem http://mastercraft.com/teamtalk/showthread.php?t=52511
but the forum wont let me upload due to size. If you want a copy or anyone for that matter send me PM with your email and I'll send it. If someone knows a work around for loading post-up, it's 4.28mb in pdf. It's pretty detailed on the entire trim tab installation and from MC.