I had a similar issue as you and I removed the dome from the antenna and found the inclination motor drive sprocket had come loose on the motor shaft and fallen off. I replaced the sprocket back on the motor and have had no issues, also it helps to leave the Wally on continuous till travel day.
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2002 KSDP 3669/Freightliner XC CHASSIS/Cummins 5.9 ISB 300hp
Joplin, MO
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