Big Three Wiring Upgrade - 2nd Gen Tacoma - Writeup with pictures!

Thank you very much! I have been trying to figure this out the past week and those pictures on the fusebox helped me out a ton. So they are all on the same circuit. I have the 2tr-fe so I'm guessing they all use the same fusebox just differently configured. Also is the generator in the diagram the starter? I'm trying to find why my starter wire seems like it goes directly to the starter in mine (in the pictures). I can't really tell in the wire loom as it sits now. Seems like if you re-route the alternator to the battery you'd have to delete the battery positive to make it all nice and tidy. But as long as they're all fused it should work?

 

The wire that came from under the fusebox, that I routed to the top stud of the fusebox... which originally was connected to the alternator.

Is the other end of that wire at 2C?

 

here are a few more

 

Generator = alternator. And yes, the starter is fed (positive and negative) directly from the battery. This is because we ONLY want the starter to get the full cranking amps from the battery, and not anything else in the system.

If you re-route the alternator directly to the battery you need to use an in-line fuse of the appropriate rating in order to protect the battery, and you will still need to feed the fusebox correctly in order to maintain the factory wiring path.

 

This post explains it:

https://www.tacomaworld.com/threads...ux-panel-and-more.712981/page-2#post-26131346

 

Perfect! I'm guessing there is an inline fuse to the starter then? I guess I'll find out when I re-route it haha. Hopefully this weekend.

 

no, im asking about my current configuration. let me draw a picture

 

There is not, but the starter is controlled by a solenoid.

 

That post explains what 2E and 2C correspond to in the fusebox.

"the threaded stud inside the top of the fusebox (AKA2E in Toyota reference material). "

"The wire labeled Fusebox + (AKA 2C), has one end connected to the positive battery terminal, and the other end you circled inblue goes to the location in the fusebox I showed you how to access with all the clips"

In other words, the "under the fusebox wire" is 2C.

 

Yes, I see that - that's the way it is suppose to be wired per our revised discussions... I am just wondering about the setup I have now. That wire that comes from under the box, is it currently connected to 2C? - I never popped out the fuse box, so I have no idea where that other end connects at. Unless you are telling me yes, that wire that I am holding in that picture has the other end connecting to 2C.

 

Yes, that is 2C, which I believe you have fed back into the fusebox and connected to 2E.

 

and if it is, then I can remove it completely and rewire it per our discussion

 

THANKS! That's exactly what I was wondering. i never popped out that fuse box, so I have no idea where that lead goes to under the box. So I can just remove it and wire it like this:

 

my setup is like this




correct setup

 

The alternator positive goes from the alternator, around the engine bay, and into a cable channel on the side/bottom of the fusebox. Once inside, it snakes up to the threaded post (location 2E) under the top cover of the fusebox. The factory harness has a 90 degree lug to make this work. If you have aftermarket wiring, you will either need to modify the fusebox (by cutting a hole), remove the cable channel (the piece that slides up and out of the fusebox body), or bend the terminal to approximately 90 degrees. Check the photos in the thread linked above for pictures of these locations.

The "under the fusebox wire", which is the fusebox -> battery feed, which is bolted to the bus inside the guts of the fusebox (location 2C), has a ring terminal on the other end which goes to the positive battery terminal.

There are reference photos of all of this in the thread linked in several places above.

 

Thank you! Yes, so the bottom sketch needs the wires swapped, alternator top of box. battery to bottom of box.

As shown here - https://www.tacomaworld.com/threads...ux-panel-and-more.712981/page-2#post-26130808

 

Thanks for the insight guys!

 

The short wire goes into the fuse box where it connects to the fuse at one end; at the the other end is the connection for the wire going to the alternator. See my thread on how to access the connections and upgrading the battery to fuse panel wire.
https://www.tacomaworld.com/threads...-box-battery-wire-replacement-upgrade.420450/

 

The rest of your wiring looks good to me. Correct me if I am wrong - you increased the gauge of the alt to fuse box wire as well as the ground wire, and added a second ground wire to the block. And I believe you also increased the gauge of the fuse box to battery wire. Thus, the middle wire (the battery to alt wire in question) is actually overkill. It is needed only if you are adding a high output alternator because no one makes a oem style alt to battery fuse beyond 140 amps, at least not the last time I checked. Just put a fuse in the middle wire and your upgrade will be complete, and safe.