Well, yes and no. 
A standard two-pin flasher has no ground. Not needed. Power comes in and heads out the 'load' side, but can't go anywhere until you move the thumb lever to turn on the lights. When that happens, a bi-metallic strip inside the flasher heats up, due to the amperage going through it, and opens the circuit. Moments later, it cools off and closes the circuit again. It heats up again and opens the circuit, etc., etc.
On most of the 3-pin flashers you find at the auto parts store, the third pin is, indeed, a ground, as they have a timer inside that runs and turns the output pin ON and OFF, regardless of what load is applied.
I don't know the exact wiring inside our GS 3-pin flashers, and that third pin is probably a ground for a timer, but it is controlled by the TSCU. I do know for a fact that the TSCU will not provide enough of whatever is needed to activate an aftermarket flasher. It WILL work if you have the TSCU wire control a relay that switches the ground pin from an aftermarket flasher.
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A standard two-pin flasher has no ground. Not needed. Power comes in and heads out the 'load' side, but can't go anywhere until you move the thumb lever to turn on the lights. When that happens, a bi-metallic strip inside the flasher heats up, due to the amperage going through it, and opens the circuit. Moments later, it cools off and closes the circuit again. It heats up again and opens the circuit, etc., etc.
On most of the 3-pin flashers you find at the auto parts store, the third pin is, indeed, a ground, as they have a timer inside that runs and turns the output pin ON and OFF, regardless of what load is applied.
I don't know the exact wiring inside our GS 3-pin flashers, and that third pin is probably a ground for a timer, but it is controlled by the TSCU. I do know for a fact that the TSCU will not provide enough of whatever is needed to activate an aftermarket flasher. It WILL work if you have the TSCU wire control a relay that switches the ground pin from an aftermarket flasher.
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