hello , so I was working on my 4runner and notice this red wire that didnt go to anything. Does anyone know where it bolts up too?

 

you might start by seeing what doesnt turn on. or maybe following the cable back to where it comes from. looks like your starter cable. does the truck start?

 

Like KeyCW says ^^^.
Was truck working before? Why are you working on it? Our sense are most important diagnostic tools. Wanna tell us what you see, hear, feel, smell about the truck that is not normal?
How can we help if we do not know year-engine-transmission-trim? Include all that on you signature.

 

If I were to guess, I would say it's the high power cable that runs from the battery down to the body of the starter. Bolts onto a relatively large screw post on the starter, and should have a rubber protector that slips over it.

All that is presuming, as it looks like, that's over on the passenger side. If it's actually over on the driver's side, it could be the cable that runs from the alternator body to the battery. Same screw-post and rubber cover set up.

It IS possible that the PO replaced the power cable going down to the starter, and just never pulled the old, original, cable out.

But I really think it's the starter power cable.
Pat☺

 

Hi:
Pat is correct.
That is the passenger side of the car, and that is the high current lead from the battery to the starter.
Either it has been left there after a replacement was installed in the cars past life, or you took it off when you were working on your car, and forgot to put it back on.
The possibility exists that the other end is still on the + battery feed. If it accidently goes to ground you will have a massive fireworks display.
Be extremely careful.
Good Luck
Art.

 

Yeah, that cable is really lousy for arc-welding. I would avoid that at all costs

Absolutely remove both battery cable from the battery until you find out for a certainty what the other end of that cable is going to. If it's a left-over after replacing the + battery cables, just pull it completely. It's a waste of sace.
If it's still connected to the battery, bolt it down to the starter before re-attaching the battery cables.
The fire works you can get from it might be a exciting and colorful display, but really, not good for the battery or cables.

Good luck!
Pat☺

 

hello everybody sorry about that been busy these past couple days. The car is 91 sr5 4wd , the car starts runs sluggish but due to needing a maintence. So Im having power steering issues and I saw that power cable and had no clue about it.

 

You still haven't traced it end to end? Yes, it could be this big cable:

 

If that cable is a remnant from the original wiring that got replaced, so is no longer used, I would still pull it out completely. Heck, if nothing else, you have a spare on the shelf.
You really don't want it touching something it shouldn't, and it will. Murphy's Law requires it.

Good luck!
Pat☺