Extra wire, where does it go?

[gzig5]

I've got an extra wire coming out of the harness to the alternator that doesn't seem to have a home.  It exits the wrap at the dip stick ('73 340 car) and it is black with a yellow stripe with a factory female blade connector on it and is currently running over to behind the alternator.  Someone spliced a couple inches into it and it would reach over to the inner fender panel if you wanted to.  Can't find anything BK/Y wire on the 70 diagram in the sticky but maybe 73 is different?  The diagram shows a blue wire for a 340 idle solenoid but this car has a Holley.  The only BK/Y wire I've found is a short one that goes from the chrome ignition module to the coil.

[Chryco Psycho]

Blk / Yellow is typically the coil ground to the ecu , possibly the coil was mounted on the inner fender

[Burdar]

The only wire that should reach over to the passengers side inner fender is brown.  It should go to the electric washer motor.  If you have manual washers, the brown wire is looped up on a clip attached to the alternator. 

[Jay Bee]

Here's 1973 schematic taken from the My Mopar site. Looks like Neil got it, there's a Blk/Yel  from the coil in that picture.
http://www.mymopar.com/downloads/1973/73BarracudaA.JPG

[gzig5]

The BK/Y from the ECU to the coil is there.  This wire is not that one.  It ends up at the alternator but I don't know where it starts.  I'm afraid to touch anything too much because the loom has been hacked and everything is in poor shape.  I've ordered a new harness from Year One and will figure it out when it comes in.  I think it goes back to the bulkhead connector but haven't been able to trace it yet.

[Burdar]

See if it has power when you run the windshield washers.  Maybe someone spliced in the wrong colored wire to replace the brown washer wire.  Either way, it doesn't matter since you have a new harness on the way.

[DodgeGuy]

The BK/Y from the ECU to the coil is there.  This wire is not that one.  It ends up at the alternator but I don't know where it starts.  I'm afraid to touch anything too much because the loom has been hacked and everything is in poor shape.  I've ordered a new harness from Year One and will figure it out when it comes in.  I think it goes back to the bulkhead connector but haven't been able to trace it yet.

Best thing I've done so far on my Challenger is replace all the engine wiring and front light assembly harness too.

My engine harness was a mess between just the sheer age of the car/wiring and then like yours, mine had been all hacked into running various aftermarket parts, and then other stuff left unplugged, etc.

I am now VERY familiar with what almost every wire under the hood goes to and then what that does...and best of all they're all new.

[FSHTAIL]

The BK/Y from the ECU to the coil is there.  This wire is not that one.  It ends up at the alternator but I don't know where it starts.  I'm afraid to touch anything too much because the loom has been hacked and everything is in poor shape.  I've ordered a new harness from Year One and will figure it out when it comes in.  I think it goes back to the bulkhead connector but haven't been able to trace it yet.

Best thing I've done so far on my Challenger is replace all the engine wiring and front light assembly harness too.

My engine harness was a mess between just the sheer age of the car/wiring and then like yours, mine had been all hacked into running various aftermarket parts, and then other stuff left unplugged, etc.

I am now VERY familiar with what almost every wire under the hood goes to and then what that does...and best of all they're all new.

Where did you get the wiring harnesses?

[Rich G.]

Is it an A/C car ?  One wire would go to the compressor. That would be up front. Just a thought.

[gzig5]

Not an AC car, but maybe the AC wire is there in the standard loom?  I bought a new B&H engine harness from YearOne.  I talked to Roseville and they didn't have the one I needed in stock and would have to drop ship from YO, but the guy was extremely helpful and gave me a 20% off code at YO.  So I ordered from YO along with a couple fastener kits for the grill and something else.  $18 shipping for a two pound box and the fastener kits which were not there, back ordered  .  Would have been nice to know that on the front end.  I really don't like companies that pad their profit margin with ridiculous shipping charges, and their pricing is not the lowest for many things.  Won't be going back to YO unless I absolutely have to. 

Will fit the new harness as soon as the more pressing work in the trunk/fuel tank is wrapped up.