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TowingThe controller shows gain setting, outputbar graph, and trailer connectivity statusin the information display. They appear inthe information display as follows:• TBC GAIN = XX.X NO TRAILER:Shows the current gain setting duringa given ignition cycle and whenadjusting the gain. This also displays ifyou use the manual control lever ormake gain adjustments with no trailerconnected.• TBC GAIN = XX.X OUTPUT=/ / / // /: Displays when you push yourvehicle's brake pedal, or upon use ofthe manual control. Bar indicatorsilluminate in the information display toindicate the amount of power going tothe trailer brakes relative to the brakepedal or manual control input. One barindicates the least amount of output;six bars indicate maximum output.• TRAILER CONNECTED: Displayswhen the system senses a correcttrailer wiring connection (a trailer withelectric trailer brakes) during a givenignition cycle.• TRAILER DISCONNECTED: Displays,accompanied by a single audible time,when the system senses a trailerconnection and then a disconnection,either intentional or unintentional,during a given ignition cycle. It alsodisplays if a truck or trailer-wiring faultoccurs causing the trailer to appeardisconnected. This message can alsodisplay if you use the manual controllever without a trailer connected.Procedure for Adjusting GainNote: Only perform this procedure in atraffic-free environment at speeds ofapproximately 20-25 mph (30-40 km/h).The gain setting sets the trailer brakecontroller for the specific towing condition.You should change the setting as towingconditions change. Changes to towingconditions include trailer load, vehicle load,road conditions and weather.The gain should be set to provide themaximum trailer braking assistance whilemaking sure the trailer wheels do not lockwhen using the brakes. Locked trailerwheels may lead to trailer instability.1. Make sure the trailer brakes are in goodworking condition, functioning normallyand properly adjusted. See your trailerdealer if necessary.2. Hook up the trailer and make theelectrical connections according to thetrailer manufacturer's instructions.3. When you plug in a trailer with electricor electric-over-hydraulic brakes,TRAILER CONNECTED appears inthe information display.4. Use the gain adjustment (+ and -)buttons to increase or decrease thegain setting to the desired startingpoint. A gain setting of 6.0 is a goodstarting point for heavier loads.5. In a traffic-free environment, tow thetrailer on a dry, level surface at a speedof 20-25 mph (30-40 km/h) andsqueeze the manual control levercompletely.6. If the trailer wheels lock up, indicatedby squealing tires, reduce the gainsetting. If the trailer wheels turn freely,increase the gain setting. Repeat Steps5 and 6 until the gain setting is at apoint just below trailer wheel lock-up.If towing a heavier trailer, trailer wheellock-up may not be attainable evenwith the maximum gain setting of 10.204F150 (TF6) , enUSA