How to reverse polarity

[davisgraveyard]

I want to hook a 12 VDC device up to a Prop 1.  It is a hydrolic motor for a convertable top.   The way it works is you reverse the polarity to make the pistons go up and down.

How do you alternate the polarity using a Prop1?

[goober]

Try a latching relay or use 2 relays on seperate outs on your prop terminal strip.
Make sure you program doesn't activate both relays at the same time.

[JonnyMac]

The safest way to do it is with a couple relays.  In this example OUT0 controls power to the motor, OUT1 controls direction.