The black relays are no good. They should have given you the superceded part, which is an orange or green relay with the fuse built into the top.

I'm almost positive that you narrowly missed an underhood fire. Since the fans are wired directly to the battery, the relay itself incorporates a fuse. With the black relay, the fuse is internal and can't be replaced. My experience is that when the relay fail s closed, the fuse overheats and can burn the case.

http://www.peachparts.com/shopforum/attachments/diesel-discussion/131750d1440306806-troubleshooting-electric-fans-blackrelay.jpg

http://www.peachparts.com/shopforum/attachments/diesel-discussion/131751d1440306994-troubleshooting-electric-fans-orange.jpg