I just went through a real mess getting my truck repaired. The fuse block burned up from corrosion runnoff. The runoff entered the fuse box where the 12 volt main bolts to the fuse/relay box. Once it was in, it destroyed the entire unit. Save yourself $400 and cleanup your connection today. I toke another step and siliconed the openings in the new box.

 

What was running in there? Salt laden water from the roads?

 

Yep. That and the white powder from the connection deterioration. I will post pics later today for everyone to view. This is EASILY prevented.

 

Coat it with a dielectric grease. It's what it's made for. It'll be better than silicone because the silicone can trap moisture in. This dielectric grease will displace the moisture, plus to work with the terminals, simply wipe it clean and recoat