I am new to this forum, so I want to say thank you in advance for any and all assistance. I purchased a 2011 Chevy HHR with an Invisibrake system and can't seem to get it to work. I purchased the LED warning light that mounts in the motorhome, all other components appear to be in the tow vehicle. I have connected the HHR to our 2003 Holiday Rambler and nothing happens with the Invisibrake unit. Should the unit come on, make any noise etc? I have checked the fuse and all seems to be OK. Any help would be greatly appreciated.