Left rear blinker not working but bulb is good. Front works but blinks but fast. Getting no power to rear plug for blinker. Need solution pls???

You'll have to locate the circuit for the left, rear turn signal at the steering column under the dash. A 12v test light should blink when prodding that circuit and the left turn signal is on. If it does not the problem is in the switch. If it does there is an open in that circuit between the point where the test light is and the left, rear bulb. The problem could be with the socket itself.