the horn will be louder, you can run it with 12 volts as long as you don't keep
on the horn. the original wire should be about 4 inches behind the dash on the
top of the steering cloumn sticking out just and inch or 2.
tcape wrote:
> Thanks to everyone for all the info on wiring a horn. My horn has never
> worked on my '47, and this gives me some good instructions for fixing it. I
> have two questions.....what additional steps are needed in rewiring a horn
> on an AD truck that has been converted to 12 volts?
>
> The PO installed an aftermarket horn button on the underside of the steering
> column. How can I tell if he pulled the wires out of the steering
> column....or just bypassed the steering column to install the aftermarket
> horn? Many thanks!
> Tom Caperton
> 47-2nd 3100....in Whiteville, NC
>
> ----- Original Message -----
> From: "Hanlon, Bill" <Bill.Hanlon@COMPAQ.com>
> To: "'Mike Suriano'" <climbandmaintain@yahoo.com>;
> <oletrucks@autox.team.net>
> Sent: Monday, September 25, 2000 10:18 AM
> Subject: RE: [oletrucks] Horn wiring
>
> > The horn is a high current device. The horn switch in the
> > steering column is not. In order to solve this problem
> > a relay is used. On a TF truck, the relay is on the
> > engine side of the firewall, near the driver's side
> > hood hinge.
> >
> > One terminal of the relay connects to some point in your
> > electrical system that is hot all the time. The second
> > terminal connects to the horn. The third terminal connects
> > to the horn button. The big question is which terminal is
> > which. If your lucky the relay may be marked. Something
> > like BAT, HORN. I'm never lucky.
> >
> > If you have an volt-ohmmeter you can figure out which terminal
> > is which.
> > a. Unhook all three wires from the relay.
> > b. Use the ohmmeter to find the pair of terminals
> > that show continuity. Mark one of the pair as
> > terminal 1, the other as terminal 2. Mark the third
> > terminal (the one that had no continuity to
> > terminal 1 or 2) as HORN.
> > c. Connect terminal 1 from step b to ground.
> > d. Switch the ohmmeter to DC voltmeter mode.
> > e. Connect + lead of voltmeter to the HORN contact
> > on the relay.
> > f. Connect the - lead of the voltmeter to ground.
> > g. Set the voltmeter range to measure 12 volts.
> > h. The voltmeter should read 0v.
> > i. Touch a wire with 12v to terminal 2 while observing
> > the voltmeter. There may be a small spark. You
> > may hear/feel the relay pull in.
> > If the meter reads 12v
> > mark terminal 2 as BAT
> > mark terminal 1 as BUTTON
> > If the meter reads 0v
> > mark terminal 1 as BAT
> > mark terminal 2 as BUTTON
> >
> > Disconnect all the temporary connections from steps a. thru i.
> > and wire the horn like this:
> >
> > Connect BAT to the battery. Needs to be hot all the time.
> > Use large wire, at least 12 gauge. 10 would be better.
> > A good place to connect to would be the starter end
> > of the positive battery cable. Most FLAPS carry crimp-on
> > connectors with a large enough "hole" to fit over the
> > same stud that the battery cable connects to. If your
> > wiring kit has connections for horns use them instead.
> >
> > Connect HORN to the terminal on the horn. Again, use
> > large wire.
> >
> > Connect BUTTON to the wire in your steering column.
> > Not as much current being carried here. 16-18 gauge
> > wire is OK.
> >
> >
> > -----Original Message-----
> > From: Mike Suriano [mailto:climbandmaintain@yahoo.com]
> > Sent: Sunday, September 24, 2000 8:12 AM
> > To: oletrucks@autox.team.net
> > Subject: [oletrucks] Horn wiring
> >
> >
> > Can someone please explain to me how to wire the horn?
> > I have the complete harness (Chevy Duty) all hooked up
> > but for the life of me can figure out how the horn
> > hooks up to the steering wheel. I have the a terminal
> > that goes to the horn and one ending inside the cab.
> > I assume that I need to run a wire from there to the
> > horn button? How does this thing attach to the
> > steering wheel? I've looked over the manuals and I can
> > find a picture of it at all. Can someone help me out?
> >
> > Thanks,
> > Mike
> > Clueless on Cape Cod
> >
> > =====
> > 1959 Chevy Apache
> >
> > __________________________________________________
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> > oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
> > oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
> >
>
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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