IF truck stays on property just repair/replace enough wiring to run basic ignition/charging system and not worry about the rest.... Mice/rat chewed wiring is probably caused by insulation that is made from SOY bases materials.... Automotive industry when to a lot of SOY bases materials for automotive wiring insulation because it was cheaper,... We live in foot hills of California and rat/mice chewed wiring is common problem... Lots of disgruntled people when they find out their $40,00 car need $5,000 to $8,000 for parts (replacement harnesses) and labor because autos industry try to sac 5 cents on cost of wire (Subaru got hit with "class action" suit because of this)...... . Driving around you see lots of cars parked with hoods propped up, rats/mice like secure enclosed environments to eat and nest, propping hood open removes the secure environment...