ust a switch. Open or closed. Open
is off. Closed it on. When closed, it completes the electrical contact (or
circuit) for a horn. There are a couple ways to hook things up to the back
of this button. Ill cover both here.

When you remove your steering wheel, you will very likely find a single
wire coming from a center area of the hub, several inches into the hub.
This single wire is only one half of the completed circuit, since any elec-
trical circuit requires the two parts be joined to be completed. Volvo uses
a ground circuit for this operation, so the two halves of this circuit become a completed ground for the horn button_circuit/' >system when
the horn button is pushed. You will not find any 12 volt positive or hot wires in a typical Volvo horn button circuit.

For the steering column, the circuit
is normally completed when the
center wire is connected to the
grounded or common portion of
the steering column. So pressing
the button simply completes the
circuit from the center wire (A),
through the button, to the common
portion of the column (B).

For the most common horn button
installation, the center wire is con-
nected to the center connector (A)
on the button. Then the brass bar
(which is the same circuit half as
the outer (B) connector) rests
against the inner hole of a steering
wheel (as long as its up against
metal), or it rests against the in-
side of the metal ring shown below
(or one like it). The metal ring is
then bolted to the steering wheel (and hub). This way the circuit will be complete when you push the horn.

An alternate method can be used if the
brass bar will not be resting against metal,
or if the metal it touches doesnt complete
your circuit. With this method, you will
simply find a way to secure a wire to the
common or grounded portion of the col-
umn. The other end of the wire is then
connected to the (B) connector.

Connecting a wire to the common portion
of a column can be a simple as crimping on a ring terminal and bolting
the terminal to an outer hole in the hub when the steering wheel is bolted down. A MOMO steering wheel typically has 6
such bolts. A Grant wheel usually has 5 (the metal ring shown is for a Grant wheel).

B: These are
both the same
half of the circuit,
so use only ONE
of these for the
common hookup.
A: Use this
center terminal
for the center
wire.
The horn button is an On/Off
Switch. Pressing the button joins
A and B together to complete the
electrical circuit for your horn.
This brass bar is
always connected
in common with
the (B) connector
closest to the
outside edge.
A
B