Hot Rods Still wiring

You guys have the fuse rating confused. The fuse should be sized smaller than the wire it is protecting. You want the fuse to blow before the wire burns, that what the fuse does.

Sizing the wire is different. The wire needs to be heavy enough to carry the load of the device it powers. Too small is risky, a little big provides a margin of safety.

 

The fuse is almost always rated 125% of the load, and this is to eliminate nuisance tripping. If it was rated the same as the load it will blow under normal running current draw, and not handle initial in rush current.
Wire size is rated higher than the current draw, and also always larger than the load too. How much larger depends on the type of load, and total devices that might be running simultaneously. If you added up every circuit on your car's fuse block and sized the feed wire for the fuse block based on the total load it would be a huge feed wire! But it's not because you're never running all those loads at the same time. Most fuse blocks are made with a #8 40 amp main feed wire, and a couple circuits could draw that. But they don't melt down when you're driving, and have multiple draws on the fuse block.

 

Now that you know what and where all the wires go. Step#1 Do***ent the wiring for future...Step #2 Put wires back where they were...Step #3 Fill up the tank...Step #4 Check fluids-tire pressure...Step #5 Throw it in DRIVE...