QUOTE ("dieselsmith":7369uals)
In a nutshell you can swap the 2 big cables at the winch and it will solve your issue. All the contactor does it swap polarity to make the DC motor go forward or backward.
It would be best ot figure out which leads you have reversed. It could be the 2 ends on the winch, the others ends of those cables at the contactor, OR the 2 power supply cables (12v + and 12v- )
In a nutshell you can swap the 2 big cables at the winch and it will solve your issue. All the contactor does it swap polarity to make the DC motor go forward or backward.