Under the cap of the power distribution module, right at the top, there is a two connector (red one and green one) with two screw on nuts. When I disconnected the unit I had to remove those two nuts and the red and green "two-hole" connectors. Now, I'm putting this all back together but it seems there is supposed to be some time of spacer between the red and green connectors to isolate them from each other. If so, should it be a rubber or non-conducting spacer type? Thank you.