joker thats hard to say because its not a across the board thing. this is only something for you to thank about if you use circut brakers you can use smaller wire. a start would be, #1 before the fuse box use 12 ga. wire, #2- after the fuse block use 16 ga. wire, #3-and then 14 ga. to the heavy draw things like the headlights, heater, wipers and ign. if youve got good grounds, good solder joints, all new wire you shouldnt have a problem.