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First try pulling the Left brake handle. Some models have the safety switch wired to both brake levers.
For the Loose wire, Where exactly is it? Please comment below with more information.
Usually the wire connector will be fitted so they hang loose near the place it plugs into. Use a small work light and carefully look around the area the wire is hanging. You won't need to stretch the wire to reach. That should give you an idea as to how far away the other end of the connector is.
GM had a lot of problems with the circuit boards that house the rear lights. My suggestion is to use a test light clip one end to the trucks body parts then remove brake light switch the orange wire should light the bulb on test light this is the power wire, the white wire is the stop light circuit with switch out this also should be lite up. Drop down turn signal switch connector the brake lamp wire goes up the turn signal switch and comes back down the yellow and green wires no power there it is a bad turn signal switch. If Ok Now remove one tail lamp assembly unplug harness and test for power if still have no power trace wiring back to fire wall and check at bulkhead connector. IF ok then circuit board is bad.
above the steering column there is a 6 way plug, it is an actual jumper harness to the brake switch it is held in place by a rosebud, pop the rosebud out and check the plug for being fully seated, I have seen many of these that have been partially pulled apart and it actually breaks the circuit/and can short it out, other than that if thats o.k. then your turn signal switch in column is defective.
Yes, you need the other wires to provide the trailer with battery voltage. If the trailer has trailer brakes, you should have an RV mechanic wire up the connector so the brakes on the trailer operate from the Ford.
THE BRAKE LIGHTS DO GO THROUGH THE TURN SIGNAL SWITCH. TO TEST, REMOVE THE PLASTIC COVER AROUND THE THE COLUMN, UNDER THE STEERING WHEEL. THE TURN SIGNAL SWITCH MUST BE IN THE OFF POSITION. YOU WILL NEED TO EXPOSE THE WIRES UNDER THE STEERING WHEEL. DO NOT DISTURB THE WIRES IN THE YELLOW JACKET. THEY ARE AIRBAG WIRES. YELLOW PLUGS YELLOW JACKETED WIRES ARE AIRBAG.THE WIRE IN QUESTION HERE IS YELLOW BUT IT IS NOT IN A YELLOW JACKET, [ SLEEVE ]. NOW, PUSH ON THE BRAKE PEDAL. THE YELLOW WIRE IS LEFT REAR TURN & BRAKE WIRE, DARK GREEN IS RIGHT REAR TURN & BRAKE WIRE. BRAKE PEDAL DEPRESSED, IF BOTH OF THOSE WIRES HAVE POWER, ALL OF THAT IS OK. IF THE YELLOW WIRE HAS NO POWER TURN SIGNAL SWITCH IS BAD
Not even the third eye? then the fuse is blown or all the bulbs are out or the brake light switch on the break pedal is bad wire off or broken( it breaks right off the plug then crosses then blows the fuse as the loose broken wire hits the brake pedel arm. Test the break pedal switch first if the third eye doesesnt work either. no power with a test light the fuse is blown or the wire broke ( the wire goes straight to the switch from the fuse and doesnt go anywhere elese. the other wire if hot should light the lights. Most of these wont come out of park without this working as the wire also turns on the park release but some Fords the park release sticks released and Ford made em that way as they didnt like the brake to get out of park law. If the brake lights dont work maybe you ought not be able to get out of park anyway till its fixed. the switch is hot on both wires with the switch pused down and the lights dont still work go after the third eye first if the bulbs are bad change em before you do the rest of the work. on cars with yellow turn signals the brake lights all work on the same wire but red only use three wires, but you didnt say the turn signales didnt work if they work and they are red you r on the way to the turn signal switch as the brake switch powers the turn switch with power then it splites it fot the two lights and adifferent switch circuit for the front hooks them all together for hazard. yellow turns in the back or even separt bulbs can mean blown bulbs ther too its old enought for all the bulbs to fail and the runs still work.
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