advanced autowire harness install

[alproc]

I'm Installing a advanced auto wire harness.I have a new Moss motors turn signal switch and I'm using the supplied autowire connectors. Here's the problem. Out of the turn signal/dimmer/horn sub harness is a black wire that's not shown on the schematic. Is it safe to assume that it a ground wire.

[restorejag]

Alan,
That is the ground wire for the horn.
Mike

[alproc]

Mike, thanks for the advice.