Random Wire!?

[moozieman]

I'm working on putting my 1978 280z back together and I found a random wire and have no clue where it goes. Posting it here might be a longshot due to the lack of information I have but I thought i'd try. There is a white w/ black stripe wire coming out of the harness that runs under the ignition coil on the drivers side. In the middle of that wire is a bullet connector that transitions the white/black to an all black wire. Then it appears to be torn off of something. I cant find any "white blacks" in the schematics and the only clue I have is that it is a live wire- It sparks when I ground it. Like I said, its in the general vicinity of my ignition coil. Thought it might have gone to the resistor underneath, but I have come to find that the 280 didnt have those. Any ideas?

[Zed Head]

Sounds like the wire to the condenser/capacitor on the fender well.  It would be hot when the key is on.  See if the condenser is still in place, it's right across from the coil on the fenderwell.

[moozieman]

1 hour ago, Zed Head said:

Sounds like the wire to the condenser/capacitor on the fender well.  It would be hot when the key is on.  See if the condenser is still in place, it's right across from the coil on the fenderwell.

Actually, i just realized it might be off of my bcdd. A possible answer to an idle issue that I’ve had. It’s almost as though the car has “two” idles. Spends 10sec at 1500 then will drop to 800 for 10secs. This is a completely different subject, but the fluctuating idle just came to mind. Thought? 

[Zed Head]

Could be.  Is the condenser there with a wire attached?  If so, it's not that.

My 1976 BCDD wire was black, I think.  You might check the 1978 wiring diagram.  The forum has some really nice color versions.

https://www.classiczcars.com/files/category/1-wiring-diagrams/

[siteunseen]

Sounds like the bcdd to me too. Black from bcdd to w/b with butt connector. W/b goes into the harness under the coil.

[moozieman]

1 hour ago, Zed Head said:

Could be.  Is the condenser there with a wire attached?  If so, it's not that.

My 1976 BCDD wire was black, I think.  You might check the 1978 wiring diagram.  The forum has some really nice color versions.

https://www.classiczcars.com/files/category/1-wiring-diagrams/

I do have the condenser. Assuming that this wire IS the bcdd, could that be causing an issue with my idle?