https://www.amazon.com/gp/aw/d/B093GMF6M1?psc=1&ref=ppx_pop_mob_b_asin_title
I had two relays like these on hand.
The motor reverses polarity to extend or retract. The motor wires connect to #30, one on each relay. -12VDC connects to 87A of each relay and +12VDC goes to 87. -12VDC connects to 85 coil terminals of each relay. Terminals 86 of each relay goes to the existing awning switch and +12VDC feed the same switch. To extend, the awning switch feeds + to the extend relay terminl 86 energizing that relay which connects 87 to 30 and feeding +12VDC to the motor on the left side and -12VDC to the right. Release awning switch and extend relay returns to where 30 is connected to 87A which places a short across the motor stopping the motor. To retract, the retract relay becomes energized and the polarity is reversed.
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