Electric problem with blinkers, they blinkers flash very fast?

That's the classic symptom of a bad ground. A clue is if you turn on the left flasher and both rear sides flash, remove the right bulb from its socket and the left one will quit too. Current goes through the left signal filament, can't find a path to ground, so it doubles back through the tail light filament in that bulb, then over to the right tail light, through that one, then to ground over there.

Check all of the other rear bulbs, like the license lamps and side marker lamps. There's too many diagrams to dig through. Knowing which other bulbs don't work can help narrow down the location of the bad connection.

Here's all the diagrams for the turn signals. I'll study them tonight. I'll be back tomorrow to see what you found.