Our replacement wiring system for the 616 model large frame Tractors is built the same as our 620/720 system. A lot of wiring upgrades in wire size and design handles loads as well as heat much better than the OEM wiring system.  All terminals soldered with new connectors make this system bullet proof like our 620/720 system. Our cotton woven tar/fiberloom protects the Polyethelene crosslinked Marine wire we use for our Tractor systems. Also protects the system better in the hot engine compartment!  You won't find another system like this one period! Don't guess. Get the best! B&B Custom Circuits products!!