I am installing a new wiring harness in my 71 FJ40. I need to know if I can install a fuse able link in-between the voltage regulator and the fuse box. The + feed comes from the voltage regulator directly into the fuse box (different from the original factory harness). I had an issue where my voltage regulator lost ground and the + feed wire melted all the way and into the fuse box. I attempted to install a new wire but per the wiring harness maker there is no easy way to install a new wire into our fuse box. Well I tried anyway and now my voltage spikes, it pegs the voltage meter. It is not the regulator or anything else it is the now defective + wire. I have a new harness I am just trying to find out if I install a fuse between the regulator and the fuse box will this cause me any issues. I want to make sure that if I were to ever again loose the ground on my voltage regulator that this cannot happen again. If this is not the right way to go as far as installing a fuse to protect my new fuse box and harness what should I do. I do not have access to a factory harness and as you can tell by my question I lack the skill and know how to build one, for that reason I am installing a duplicate ( new harness matches the old harness wires are colored the exact same ). I did contact the maker of the new harness and was told putting a fuse able link in between the voltage regulator and the fuse box should not effect anything. He suggested a 50amp. He did not speak confidently and did not seem all that familiar with the early FJ40 wiring so that is why I am asking the experts on mud.