Blue Ox BX88175 - Manual (Page 3)

© 2002, 2006 Blue Ox Division, Automatic Equipment Mfg. Co. • One Mill Road, Industrial Park
Pender, Nebraska 68047 • Phone 402-385-3051 Fax 402-385-3360 • www.blueox.us
292-5958 10/07 Page 3 of 10
wire from the other end of the cut wire to tab 30 on the relay. Connect a wire from the car's fuse panel (12V
IGNITION) to tab 86 on the relay. Tab 85 needs to go to a good solid ground connection.
When NOT using the relay, connect a wire from the wiring connector to the "cold" side of the brake switch.
TESTING AND TUNING THE SYSTEM
CAUTION: ALWAYS PERFORM THIS TEST IN A SAFE CLEAR AREA. ALWAYS BE PREPARED TO USE
YOUR FOOT TO STOP THE TOAD VEHICLE DURING TESTING.
a. Start the engine of the toad vehicle, making sure that the Vac Brake™ does not apply. If the Vac Brake™
applies, verify the breakaway pin is inserted in the breakaway switch.
b. Push the box test BUTTON to the momentary position and this should apply the Vac Brake™. Releasing
the BUTTON should release the Vac Brake™. With the vehicle in drive, and moving at idle speed, apply the
Vac Brake™ with the test BUTTON held “ON”. When the vehicle comes to a stop give it a little throttle and
let off. The vehicle should move forward as you give it throttle, and stop when you let up (you will have to
hold the test BUTTON during testing of brake strength) Fig. 4
c. To balance and adjust Vac Brake™ braking strength, repeat the test in step b. moving the cable ball
connection along the box arm bracket “in towards the pivot point for stronger braking” or “out from the pivot
point for less braking” this compensates for to much throttle or to little throttle, respectively, needed to move
the vehicle. THIS “IN AND OUT” LEVERAGING FROM THE PIVOT POINT ON THE BOX ARM IS THE
STRENGTH ADJUSTMENT Fig. 4
d. Vac Brake™ application speed is adjusted with two needle valves built into the Vac Brake™ solenoid. The
“AE” needle valve controls the speed of Vac Brake™ release; “BE” needle valve controls the speed of
Vac Brake™ engagement. We recommend the release be slower than the engagement. THIS VACUUM
FLOW ADJUSTMENT CONTROLS BRAKE APPLICATION SPEED AND RELEASE SPEED. SPEED IS
FACTORY SET WITH MINOR ADJUSTMENTS DONE BY THE INSTALLER AS NEEDED. RELEASE
SHOULD BE SLOWER THAN PULL DOWN SPEED. Fig. 5
2. RV INSTALLATION - RV WIRING: Fig. 2
WARNING: WHEN INSTALLING THE INDICATOR LIGHT IN THE MOTORHOME, DO NOT DRILL A
HOLE DIRECTLY IN THE COACH'S DASH.
Drilling a hole directly in the dash of the coach could
cause serious damage to the on-board computer systems. This applies to all makes of motorhomes, but
is especially pertinent for Bluebird motorhomes. Alternate methods for installing the indicator light are as
follows:
Drill the hole lower in the bordering plastic of the dash
Drill the hole to the left of the driver's stall if there is room
Use a toggle switch mounting bracket from a local automotive store
a. Locate an easy to reach place for the remote control RV dash switch to be installed.
b. Looking at the back of the switch, with the row of three terminals oriented towards the top, connect the
monitor signal wire (from the TOAD’S brake light switch) to the lower right terminal. The lower left terminal