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NEW SUN 4 pole to 7 pole blade vehicle adapter is an electrical device that allows a connection to be made between a mismatched trailer plug and vehicle socket. It easily plugs in your vehicle's electrical socket and usually requires no additional wiring. Features: 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 Specification: Harness length: 12" 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