: Mystery Black Wire

05-19-14, 06:12 AM
Hey all,
I wasn't quite sure where to post this, so please excuse me if this isn't the correct place. I recently pulled an engine from a 2001 Eldorado ESC. In the PCM harness I found a thicker gauge (14 or 12 I think) black wire, before I go through the trouble of tracing I was hoping someone here would know where it goes and what it does. Being a black wire I would assume its a ground, but I'd like to make sure before I fry anything. Here is a link to the picture: http://i1217.photobucket.com/albums/dd396/Coldreach/20138E21-201D-4AA8-BC0C-3303F3680EFC_zpsxcvjuvpe.jpg


05-19-14, 11:12 AM
That's some type of aftermarket add on.

05-19-14, 12:17 PM
You could always put it back together and check for codes assuming it is supposed to be in the car. It doesn't look like it goes very far...

05-19-14, 03:35 PM
The bundle of red wires does not appear to be factory either.

05-19-14, 09:36 PM
The bundle of red wires connects to the bottom of the fuse box with a bolt, both cars have that so I am pretty sure its stock. As far as the black wire goes, there was nothing aftermarket added to the car at any point to the best of my knowledge, I guess I will just have to trace it back

05-20-14, 10:28 PM
Black wiring usually is used for grounding purposes. The second photo bucket link shows that the terminal ismissing from the end of the wire.

You'll find where it goes when the harness is rerouted back into the car. Just look out for an eyelet terminal missing the wires that are supposed to be connected to it.

05-22-14, 05:38 AM
I managed to find it today, just a ground to the frame. Thanks all

05-25-14, 03:01 AM
Looks all stock to me. Is that the one that goes to the ground point near the driver's side headlight? Looks like the ring terminal was pulled off.