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Airhead
So go back to the start, and check the wiring diagram (Haynes manual normally) vs the wires you have.
I'd say, disconnect all the indicators, then plug in only one side. Get them flashing and happy, then disconnect do the other side. Then try everything plugged in.
Fast flashing can be due to incorrect load on the blinker unit. Normally they stay on when you have one light not working (not enough load), and they blink fast when the wattage of the bulbs is too high for the setup (too much load).