ITEM NAME:4-Way Flat To 7-Way Rv Blade Trailer End Electrical Adapter Plug A3W4 4-Way Flat To 7-Way Rv Blade Trailer End Electrical Adapter Plug A3W4 for durability Converts from 4 pole flat vehicle to 7 pole RV blade trailer adapter Spare wires for other functions, back up lights or adding brake controls Well sealed spring-loaded dust cover keeps adapter clean when not in use Works on most vehicle wiring component like turn signals, brakes and auxiliary power Converts 4-way flat trailer connector to a 7-way RV-style connector Additional wire leads for electric brakes, 12V power, and accessory wiring Spring loaded dust cover protects connector from the elements Easy installation Wiring harness plugs into existing 4-way flat connector and hardwires to existing wiring Green wire (from 4-way plug): right turn signal and brakes Yellow wire (from 4-way plug): left turn signal and brakes Brown wire (from 4-way plug): tail lights Blue wire: electric brake controller Black wire: battery Yellow wire: 12V power supply or auxiliary White wire: ground wire colour:black Material:Plastic + metal size:Harness length: 12 inch Package Contents: 1*Adapter Plug