Left blinker stopped working , help.

So this cold NYC morning, I had to get to set , I put my keys in and....nothing. the oil light came on, the battery read 12.56 so I had to "jump" the starter with a screw driver. But now my gauges are dead and so is me left blinker. Thoughts? Change fuses? Relay? Would just the right blinker work if the relay was bad?

12.5 volts is normal. If you shorted the solenoid to start it, then the battery is fine and you have a different sort of problem. First place to check is the starter relay. Could be wiring problem, ignition switch, starter solenoid, etc. You need to do a trouble shooting procedure to narrow it down. I know of no failure mode related to starting and just the left turn signal.