My car has a Supra pump that was wired to a 12v relay by the previous owner. The car 'HAD' a battery in the trunk with a positive and negative running, unswitched, directly to the relay. The relay has two wires running to the pump. That's it. no signal wire for the relay and no switches...

I want to revert back to stock fuel pump wiring.

And then there's a 6 wire plug left open... I don't know what it goes to.

 

I don't have one so I don't know for sure but do you have a car that came with the the Bose wave system? Maybe it's the connector for that. Again, not positive, but if you have a car that originally came with Bose and doesn't have it any more, maybe that's it...

 

After looking through the electrical part of the shop manual, I think that's almost definitely what it is...

https://www.google.com/url?sa=t&rct=..._byXFw&cad=rja

Page Z-88 and Z-89 for details on that plug.
Per Z-89, it's a black plug in the same region as you're seeing and per Z-88, it's 6 pins. You have a closer look at the wires so you can tell if they match up to the colors in the diagram.

Good luck.

 

first of all you dont want to run the stock wiring , you just want to redo it and do it right .. There should be a red and white wire that goes to teh fuel pump and that is the wire you should use as a signal for the relay .

there is a very good writeup on the FAQ regarding the rewiring .

 

^+1 redo it right..stock wiring = bad idea

 

Thanks for replies, I found out it went to the Bose wave day or so after I made the post once I started digging in to the manual.

I'm not exactly reverting back to stock wiring. Just removing the relay and battery relocation. Battery is back in the engine bay and I disconnected the ignition power supply to the fuel pump relay and spliced in direct battery power. Daleclark has this mod and it's simple, makes sense, and is a clean, hidden alternative.