Sorry for the dumb question, but I only know enough to get myself in trouble.. I've searched through previous questions and haven't found an answer that dumbs it down enough for me.
I'm trying to activate a 12vDC 12amp linear actuator (https://www.progressiveautomations.com/linear-actuator-ip66#ig_lightbox2[gal]/0/) to travel in/out using 2 solid state relays. (https://www.automationdirect.com/adc/Shopping/Catalog/Relays_-z-_Timers/Solid_State_Relays/Panel_Mount_Relays,_Hockey_Puck_Style,10A_-75A(AD-SSR6_Series)/AD-SSR6M12-DC-200D)
Ultimately an Arduino will control the relays, but for now I'm manually activating them with a 9v transformer for testing purposes. Currently it works fine with 1 relay attached, but when I attach the 2nd it short circuits. I believe the issue is my ground connecting to both leads on the linear actuator, but I'm not certain on how to rewire. Do I need a relay for both positive and negative leads? (4 total)