As a rule of thumb, I don't trust any of the wiring on my boat. If you think that the wiring is incorrect, you should investigate yourself to see if it is done correctly.
As for circuit protection my Promariner requires circuit protection within seven inches of the battery connection. I've rewired and used Blue Sea Systems terminal fuse blocks, they are expesive for both the fuse and the blocks but I like the connection.
Promariner charger manual excerpt:
Battery cables, connections and installation must comply with ABYC E-11 and A-31 standards. To avoid risk of injury, fire or an explosion, ProMariner requires that when making a wire connection to EACH BATTERY(s) Positive (+) Post, install the positive cable with an over current protection fuse within 7 inches of connection to the battery or battery connection point. The fuse rating should be at least 10 amps higher than the rated full output of the charger. See ABYC E-11 for specific requirements. Over current protection within 7 inches of the charger’s negative (-) DC output post is not required as the ProTech-i is self limiting and can not exceed its rated current output. The internal fuses protect the unit against reverse polarity.
Blue Sea Terminal Fuse Blocks:
http://www.defender.com/product3.jsp?pa ... &id=983740