Repair & electric manual for 2n gen Tundra

I found a working link for electrical, and repair manual for 2nd gen tundras. The link. Maybe others can use it

 

Link still works

 

I’ve got all the wiring diagrams posted here by individual year as well:
https://www.tundras.com/threads/ultimate-wiring-diagrams-collection.81448/

The repair manuals are a lot more cumbersome to download off of TIS. That will certainly come in handy.

 

I ran accross a thread that talked about big 3 wiring, and it mentioned when going bigger cable to be sure to install larger fuse also. That sort of makes sense, but I ve never heard it mentioned before. I was curious where this fuse is he was talking about. Could that be in the black box behind the battery?

 

Not sure what you’re referring to about Big 3 wiring or what that means. But wire size, fuse size, and current draw are all related. You want to size your fuse based on max current draw (with some allowance for start-up surges, etc.) on the circuit, and then size your wire for that max current draw over the distance from the source to the load. Just because you put in a bigger wire should you increase the fuse size unless 1.) you actually need more load /current draw and 2.) you make sure ALL the wire on that circuit is sized to handle that potential load.

the idea is no different than the circuit breaker in your house. if you pull too much current through an undersized wire, you’ll create excess heat that can (best case) burn up the wire until it kills the circuit or (worst case) starts an electrical fire. The fuse acts as a weak link to burn out before the load could ever melt/burn the wiring.

so, upsizing wire won’t provide any benefit of higher load capacity without having a bigger fuse to go with it, but you just need to be sure that anything run in series with whatever that larger load is has adequate wire size for the load.

 

Sure. That s what I thought too. He was talking about the positive cable that goes from the alt to the battery though. And refered to a fuse in that circut. If I install a 370 amp alt in a circut that used to be 150 amps it seems reasonable that somewhere in the circut a larger fuse may be necessarry. I just never seen it mentioned in all the big 3 tutorials I ve read.

Actually I found the post:

 

Yes, it would make sense that if you're adding an alternator that will pull higher load that you would want to upsize the wiring and the fuse that feeds it.