FORD 2005 F-550 v.1 - Manual (Page 171)

3. When a trailer with electric brakes is plugged in, the trailer connection
indicator will illuminate green on the TBC and the GAIN setting display
will illuminate.
4. Use the GAIN adjustment (+/-) buttons to increase or decrease the
GAIN setting to the desired starting point. (A GAIN setting of 6.0 is a
good starting point for heavier loads.)
5. Tow the trailer on a dry, level surface at 25 mph (40 km/h) and
squeeze the manual control lever completely.
6. If the trailer wheels lock-up (indicated by squealing tires), reduce the
GAIN setting; if the wheels turn freely, increase the GAIN setting. Repeat
Steps 5 and 6 until the GAIN setting is at a point just below wheel
lock-up. If towing a heavier trailer wheel lockup may not be attainable
and the gain should be set as to achieve maximum braking force for the
specific towing conditions.
Explanation of instrument cluster messages:
The TBC interacts with the instrument cluster message center. These
messages, accompanied by a single chime, will be displayed when the
TBC determines a malfunction in the trailer connection, TBC system, or
in the trailer. These messages are listed below:
TRAILER DISCONNECTED (if equipped with message center) or
CHECK TRAILER (if equipped with mini message center): This
message is displayed when a trailer connection was determined and then
a disconnection, either intentionally or unintentionally, has been sensed
during a given ignition cycle. This message is also displayed during
manual activation without a trailer connected.
TBC FAULT: This message is displayed in response to faults sensed by
the TBC. In the event this message is seen, please take your vehicle to
an authorized Ford dealership for diagnosis and repair.
TRAILER FAULT: The TBC is capable of determining certain faults in
the trailer wiring/brake system. This message is displayed when one of
the following faults has occurred:
• Short circuit on the electric brake output wire: If the TRAILER
FAULT message is displayed with no trailer connected, the problem is
with the wiring from the TBC to the 7–pin connector in the bumper. If
the message is displayed with a trailer connected, the problem is
related to the trailer wiring; consult your trailer dealer for assistance.
• Trailer brake overload: The trailer brakes are drawing too much
current; consult your trailer dealer for assistance.
Note: Your TBC can be diagnosed by your authorized Ford dealership to
determine exactly which trailer fault has occurred; however, this
diagnosis is not covered under your Ford warranty.
REVIEW COPY
2005 F250/350/450/550 (f23), Owners Guide (post-2002-fmt) (own2002),
Market: USA_English (fus)
Tires, Wheels and Loading
171