Once you have located the
appropriate wire, determine the
type of signal by using a volt-ohm
meter while engaging the park
brake. If a positive signal is present
the use of a relay is required (See
Figure 3). Next you will need to
splice the blue park brake
wire(PKBK) from the control unit
into the signal wire.
NOTE: A majority of new class “A”
motor home chassis are now equipped
with an automatically applied park
brake system. These systems
automatically apply the parking brake
when the transmission is shifted into
park. In the chassis wiring harness you
will need to identify the park brake
signal wire. This wire will carry a
positive 12-volt or ground signal. A
signal wire can generally be found in
one of four locations.
The steering column just below the
head and rim at the upper
adjustment point or at the base just
above the floor line.
The front bulkhead wiring
connector, this connector is located
on the driver’s side of the vehicle
and can be accessed inside the
vehicle under the dash or at the
exterior under the hood.
At the slave cylinder actuator of the
park brake.
And possibly in the transmission
wiring harness.
Once you have located the appropriate
wire, determine the type of signal by
using a volt-ohm meter while engaging
the park brake. If a positive signal is
present the use of a relay is required
(See Figure 3).
Level Best Constrol Replacement Page 3
87
87a
30
86 85
Ground
(typical)
Level Best
Park Brake Wire
Tap from
positive
brake switch
circuit.
Bosch Mini Relay
Part # 0 332 209 150
or equivalent
FIGURE 4
FIGURE 3
Wire to be
hot with
ignition on
and brake
not applied.
Relay Wiring, Brake Circuit
12 volt Positive ON
Relay required when park brake circuit does not
utilize a ground signal for brake application
7. At the pump manifold end of the
multi wire harness, the wire labeled
(TD 1) is for the jack leg position
switches. The new control requires
that the leg position switches be
wired in series. (See Figure 4)
Attach a yellow 16 gauge wire to
TD 1 at the pump manifold. Run this
wire to the first jack leg sensor and
attach to one of the two sensor
wires. Attach another yellow wire to
the remaining wire at the sensor and
run this wire to the next jack leg and
sensor. Continue this process until
all four sensors are connected.
At the last sensor attach the yellow
wire to the remaining sensor wire
and run the other end of the yellow
wire to the grounding bolt on the
pump and connect with a 5/16” ring
terminal.
8. Check all wiring connections insure
all connectors are fully inserted and
locked. Reconnect battery cables,
ground first and test the system.
Control Panel Installation
One method of installing the control
panel uses a mounting bracket to install
it below the driver’s instrument panel. If
space is available, flush mounting the
control panel into the vehicle instrument
panel is another option.
First, determine where the wires are to
be routed. Look for any existing holes
that can be used to route the control
panel wiring from the pump manifold to
the control panel location. If no hole is
found, drill a 1 1/2" hole through the fire
wall near the selected installation site.
Route the wire through the hole to the
control panel location.
All Level Best Systems: Yellow 16 gauge wire
attached to switch lead with a heat shrink butt connector
TD1
Attach to
Grounding
Bolt on
Pump
Straight Acting Jacks: The reed switches
for straight acting jacks are located at the
top of the cylinder
FIGURE 6
FIGURE 5
Route the multiwire cable through the
opening in the bracket and insert the
connector into the receptacle on the
back of the control panel shown in
Figure 6. Insert the control panel into
the bracket and attach it with four 1/2"
sheet metal screws (included in the
panel mounting kit).
Bracket Mount Application
Select a position along the lower edge of
the dash that provides adequate surface
area for mounting the bracket and allows
convenient system operation (Figure 5).
