well, that could be a couple issues.....
70 f-body's were "odd balls", to a degree. best to have a wiring
diagram, which i assume you do not.
black, while common for a ground wire, doesnt mean ALL black
wires are grounds thus the need for a diagram.
that wire being so heavy means its got to be high
current, 20+ amp fused i would guess.
see if the fuse block has a fuse for horns and pull it, then check to see
if that still gets power when the key is on.
nevermind....duh! horns have power all the time, so it's not
the horn feed.
sooooo, i dont know what to tell you. if the F-body wiper wiring is
the same as the big cars, then that would seem to be the wire from
motor to wiper switch, but, you indicate the wipers work sometimes
even with that not connected. do you have all speeds for the
wipers? low and high? if only low, maybe that's the "high speed" wire?
* shrug *
you got me.
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costs too much
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