Need help from our wiring guru's.

[mirage83]

Noticed these wires had been cut when I dropped the steering column to pull the dash and heater core. The car is an '88 GTE.

One cut wire is black and white, found this end of it on the underside of the steering column near the ignition harness and plugs. Couldn't locate the other end of the cut.

Other strand is two wire, one blue/white and one white. Cut ends were near the steering column area, and the wire extended behind/under the heater core box over to the passenger side kick panel.

Last problem (which might not be a problem at all) is this single yellow plug which I can't identify and can't locate a receptacle for. It's on the drivers side on the same wire bundle as the green led which I think indicates security system armed. It only has two pins if that helps any.

Any and all help will be appreciated, as we hope to turn the key tomorrow or Saturday if I can get this sorted out in time.

 

[adampecush]

year of car?

 

[mirage83]

year of car?

Oops, sorry, 1988 GTE.

 

[figgie]

Oh geez!!

That is one of the major power wires in the car for starting!!!!

http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=038

Manual start switch perhaps?? Ugh It could be lots.......

The second set.

white wire and the other looks like white with blue stripe because the way the blue is, looks like it is painted on . White is used by Toyota as 12+. Always. The white with blue stripes.

http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=47

Looks like it feeds the injectors 1 & 4.

If it is blue with white. I know that is from the washer circuit.

That yellow plug, man. two pins on the passenger side, blue/white and Red/Black or is that red/Green (I can't tell in the picture).......

Solar sensors on the dash. Ambient sensor. Light switch for the glove box?? Beyond that, i don't remember any other two pin system.

 

[mirage83]

:aigo: Well damn, aren't you just full of good news? Not that I don't appreciate the input, but OMAA!

I'll have to check the wire colors for the two-pin yellow plug, but whatever it's supposed to plug with has to be very close to where it is under the drivers side dash as the wire for it isn't very long at all, just a few inches at best.

Solar sensor is okay, checked that when I put the dash back. Same same ambient temp sensor.

I got a feeling that this ain't gonna be pretty, and that somebody (who I can't locate now, go figure) needs a serious ass kicking for frilling up this wiring. I HATE wiring probs. :3d_frown: I'm going to go back and crawl under the dash and see if I can't identify precisely where these wires go. And cry.

 

[figgie]

driver side?

neutral start for a M/T

Stop light.
Clutch disenegage for Cruise control. Basically a two pole switch. Definetly NOT the TEMS steering input sensor.

 

[mirage83]

Okay, rolled around on the floorboards and came up with some new info...

The cut black/white wire, found the other end of it in the wire bundle which attaches to the ignition switch. Someone had cut it, then used a much smaller wire and spade connector to run the new wire through the firewall and into the engine bay. Unfortunately, that's where the wire ended, attached to absolutely nothing. Got a good picture of the plug to make it easier to identify for certain.

The yellow plug with two wires, one is Blue/white, the other red/black, goes up into the dash harness along with the led wire. Still can't find anything to plug with it, so I guess your id as the clutch disengage makes sense in my a/t car.

The two wires together, blue & white that went over to the passenger side end up going to the back and terminating in a disconnected plug, the plug also having two red wires leading into it. No sign of what it's supposed to plug into, but it's got an old DIN looking cable with it, also not plugged into anything.

All of that jive with your guesses on them Fig? Here's some more pics if it'll help any. It's been over 20 years since I had to rely on wiring diagrams, and I'm re-learning on the fly.

 

[mirage83]

Hey Figgie, am I reading that diagram correctly in that the black/white wire (the one someone cut) from the ignition runs to the starter relay? Just wanting to make sure I've not completely lost it.

Thanks...

 

[figgie]

mirage

geezes man who sold you that car?

They absolutely butchered the starter harness circuit! Be careful on that white/blue wire. I see exposed copper and the size of that wire means that it is high current wire! Also as per before, if it is White with X color stripe. It is 12 VDC positive wire!

That blue/white cable.

Optional CD player I am thinking. Reason is that DIN plug. I didn't think that was an option back then though....

 

[mirage83]

Can't find the dude, but rest assured it was nobody on SM. He's moved at least twice since I got the car off him (admittedly for next to nothing), and I strongly recommend he keep right on moving with the kind of crap I'm finding now.

Noticed that stripped section of wire while I was tracing down the cut black/white one. I'm probably going to go in and shrink-wrap that section just to make sure nothing gets crossed on it, as that wire is definately built to carry a decent amount of current. I'll definately keep an eye open for any other white/* wires which look questionable or outright trashed.

I'm with you on the optional CD player, though also like you I didn't think it was an option on the '88. But neither plug appears to have ever been plugged into anything, so I'm not going to sweat either one right now.

What I'm trying to figure is why someone would go to the trouble of running a spliced wire from the ignition (again, black/white) into the engine bay. If it was a bad starter relay they were bypassing, they CAN'T be that expensive to just replace. Strange, but given the lack of maintenance (preventive and otherwise) the guy did on the car very few things are likely to surprise me.

BTW, thanks for your help walking me through this issue. I'm really looking forward to getting her running, and the closer we get to that point the more problems I'm finding out about and the more esoteric those problems are.

 

[figgie]

BTW, thanks for your help walking me through this issue. I'm really looking forward to getting her running, and the closer we get to that point the more problems I'm finding out about and the more esoteric those problems are.

The word esoteric, is a wonderful word!

EXCEPT when used for electrical quackery then, it is one of the most vile words ever coined! lol

 

[mirage83]

The word esoteric, is a wonderful word!

EXCEPT when used for electrical quackery then, it is one of the most vile words ever coined! lol

Yep, I think the word works anywhere a Supra is concerned. Haven't named her yet since she's not road-ready yet, but may work out a variation of the word for her depending on her attitude. :sarcasm:

BTW, reconnected the black/white wire from the ignition to the starter relay. Guess we'll see what happens when we put some power to the system.