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the motors on the power struts will operate if 12v applied directly to them, polarity is important only for the direction of movement.
there are hall effect sensors inside the actuators that tell the motors to stop once the either of the limits is reached, and some limits are programmable, as the system will count the revolutions of the internal spindle...
the power to the motors will be cut and reverse polarity applied if the gate is closing and encounters a detent - it will prevent the pinching...
the power will not applied to the motors if the lower gate is not closed, as the top gate needs the lower one in order to latch...
you need to check the relays that feed the motors to see if the relays are good, naturally, mentioning fuses makes no sense, you probably checked the fuses already...
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