Guys,

So I picked up this OBD1 sc300 swap from Gazi for my 87 Supra. I stripped it down for a rebuild - yadda yadda yadda.

So for the life of me.. I cant seem to find where my alternator plug is routed. Granted I don't remember taking it off. Its was not on the harness. I ordered a new plug and pinned it up, but I cant find ANYWHERE on the Engine harness where the three wires (yellow/green, yellow, white) are suppose to route. I peeled back the engine harness to under the injectors and I cant find any cut wires. All the existing wires are accounted for and have homes on already plugged in sensors.

I tried tracing out my 2JZGTE harness in my MK4 and the plug is routed in the engine harness there, but NOT on the 2JZGE

Can someone assist me perhaps with a pic or two? I have a suspicion that the alternator plug leads may be on the chassis harness. (just no proof yet)

If anyone can alsis tell me what each wire does on the plug... I will be greatly in yoru debt, as I will be reading my supra factory manual for the rest of the evening to try to sort this out.


Thanks,
Rich

 

SO i read the wiring diagram like I said I would

P.68 of the 2JZ wiring diagram outlines the charging system.

the three wires go to as follows,

Alternator Plug - Pin1 (Y-G) goes to Pin34 of II1(big orange 38pin connector by ECU)
Alternator Plug - Pin2 (Y) goes to Pin23 of II1(big orange 38pin connector by ECU)
Alternator Plug - Pin3 (W) goes to Pin2 of EA3 plug (Black 3Pin connector Eng Fuse Box)

I think I can easily wire that up.... I'd still like to know where the damn OEM harness is!

 

Thanks for the link. The funny thing is, that is my EXACT problem. I swapped an engine in and CANNOT find the damn alternator wires on the harness. Maybe other year GE engines have a separate designated harness for the alternator? I dont know. But this sure does help. Thanks again.

 

I'm still having a hard time understanding this, I have a 92 SC300 but I only have a 95+ alternator and I want to change my harness-as I don't have money for a 92 alternator. Which wires do I use to wire it up?

 

Im trying to do this as well. I pm'd the op a few days ago, and have yet to get a response. When I get in contact with him, I will update this thread, if he doesnt

 

You can search online or at parts stores. There is a company(s) that makes a adapter harness to go from the 5 wire to the 3 wire alternator and vice versa.

Some people have the opposite problem as you, and are wanting a 95+ alternator. You might try making a thread about a trade for the correct alternator for you, and someone may want to trade. Worth a try anyway....

 

Rise from your grave!

So on a sc300 there is a plug under the hood that used to run the alternator. 7 wires, round.

Then on the 1jz, there is a separate ALT plug.

What wires on the ALT, go to what wires on the Round underhood body plug on the SC?

This topic has NOT been clarified.

 

Well 92 alt wires are in the engine harness round plug with 3 wires

95 is in the engine bay again 3 wires.

 

I was mistaken, the plug I was thinking is the MAF plug that only gets 5v. Alternator plug in on the Drivers, side.

Thanks!

 

Where does on get replacement plugs for the wiring harness side? Mine are brittle or already broken.