HI,

i double checked all three cables again. They work fine with both units. I also checked the colors of the individual lines on the plugs. They line up as they should.

The original fuses that were in the units read T1AL250V. I killed both of them on my first two tests and was worried i had killed the remote. 

I now replaced them with F1AL250V fuses. I’m not sure what’s the difference but they seem to work fine when only one unit is connected to the remote.

I attached an image of the T adapters i used and how i wired them up. These should work i think?

Thanks for the help!