Suppression Diode - Unknown Polarity

[aaron]

Hi Everyone,

I'm building a gate controller using two SPDT relays to control an actuator. I've suppressed both relay coils with a 1N4004, which is fine. (I think). But the output for the actuator also needs suppression, correct? But the polarity reverses every time I reverse the direction of the actuator motor. What should I be doing in this application?

Also, should I be adding 1nF capacitors parallel with the coils?

Thanks! 

[Jeroen3]

You can use a bidirectional TVS diode.