Thanks for all your help and advice, you guys are great! After checking fuses and wiring, it seems to be a defective control unit under the driver's seat. Mercedes part # 9069003903, the control unit receives two multiple wire plugins. I jumped a wire to from connector 1 to the right and left signal wire and rear lights came on. I plan on bringing the compass to Mercedes this week hope they don't tell me it's a Thor issue.
I'll relay the results
Harry