Scott,
Try taking one of the batteries out of the Cab2, then put the battery back in, replace the remote control firmly in the 990 Base unit, and see what happens when you let it charge a while. The 2 lights should eventually start blinking red, then over time move to blinking green, then go solid green, it take some time however. My new 990 unit acted the same as yours, Guns advised me to try what I just told you, and my 990 eventually came on line correctly. Hope your does the same.
PCRR/Dave