Blue Ox BX88175 User Manual
Page 4
© 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 •
is to be connected to a suitable grounding point.
c. Connect a wire from the cold side of the RV’s brake light switch to upper left terminal of the switch.
d. Connect a wire from a 12 VDC power source (generally from the fuse panel) to the upper right terminal of
the switch.
e. Connect the center terminal of the switch to the “GREEN” wire that runs to the activation signal wire of the
solenoid on the Vac Brake™.
TESTING THE VAC BRAKE™ WITH THE RV
a. The lighted toggle switch is to be
ipped ON during this test ( ipped off center, and remains in place when
you remove your
nger). With the RV running, depress the brake pedal, noticing that the switch should light
up as the brake is applied, and go off slightly after releasing the pedal.
b. Repeat the test above with the switch
ipped OFF ( ipped center, and remains in center place when you
remove your
nger). It should not light up, nor should the Vac Brake™ apply.
c. The third test is to press the paddle of the switch to the momentary position. The switch should light up, as
well as the brakes of the toad apply. The light should go out and the Vac Brake™ should disengage after
releasing the switch.
WARNING: The feedback light must operate as described above or warranty is void!
If the Vac Brake™ worked properly during the tests of the TOAD and not with the RV, recheck your
electrical connections making sure the harness terminals used align properly between vehicles.
SIZING THE ELECTRICAL CONNECTIONS ACROSS TOW BAR
a. With the toad vehicle connected to the tow bar,
nd the minimum length of the breakaway lanyard by
measuring from the anchor point on the RV (as close to center as possible) to the breakaway switch.
Record this measurement as X=
b. Find the maximum length of the breakaway lanyard by disconnecting the tow bar and leaving the tow
cables connected. Slowly back up the toad until the cables capture it. Apply the parking brake, and turn off
the engine. Make the same measurement as in step a. Record this measurement as Y=
c. To
nd the length of the lanyard to be used take the measurements (X) and (Y), add them together, and
divide by 2, (X+Y)/2=Lanyard Length
d. Electrical harnesses across tow bar must be 12” longer than the (Y) measurement. No electrical connection
should be lost during a safety cable capture breakaway.
NOTE: THE BREAKAWAY LANYARD LENGTH MUST BE LONG ENOUGH TO PERMIT TURNING
WITHOUT PULLING THE PIN WHEN TOWING. THE ABOVE SIZING PROCEDURE ALLOWS THE BREAK
AWAY PIN TO PULL AND APPLY Vac Brake™ TO HELP CONTROL THE TOAD VEHICLE WHEN IT FALLS
BACK ON THE SAFETY CABLES OR CHAINS.
THIS SYSTEM PROVIDES FULL DRIVER FEEDBACK AND CONTROL
WARNING: You are responsible for monitoring the “FEEDBACK LIGHT” on the RV dash switch. If the
switch light does not “LIGHT” during normal application of the brake in the RV, there is a problem that
you MUST investigate! If the switch light does not “GO OFF” during release of the RV brake, there is a
problem that you MUST investigate! (a slight delay as the pedal releases is normal for the operation of
this system, this is just the regulated release speed as the pedal returns to full released position)
292-5958 10/07 Page 4 of 10
RV INSTALLATION - RV WIRING: (continued)