Help with Wiring Harness

[mtnman210]

As of right now the only wires on the truck are the stock ones from the tail lights to about the area of the fire wall.

I've never gotten deep into wiring and don't really understand it all that well. I need to wire the whole truck, but it's only a trail truck so there shouldn't be that much. I do have a painless fuss block with attached wiring that I'm going to be using.

This is a pretty crude drawing but I hope it helps. I'm curious what wires I should run to where and how many to each thing. Also I have no clue on using relays and where and when to use them.

If anybody can shoot me in the right direction it would help a lot.

 

[dyeager535]

You need relays anywhere you have a large demand on the wiring. Electric fan(s) and fuel pumps are usually on relays. I know electric fan diagrams have been posted, not sure on fuel pumps, but same idea. Some do lights on relays, if re-wiring the whole thing, I'd do them with relays too.

Everything else I can think of simply needs to be fused. Make sure you keep the circuits as "narrow" as possible when fusing...gauges on one fuse, etc. Otherwise you will have a hard time tracking down problems when something fails.

Can't help with laying out the entire operation specifically though, sorry.