I had a perfectly good working power antenna on w126 350sd. Now all of a sudden it doen't go up any longer. I read the manual and the Becker said it has a three way switch. I can't find it anywhere!!! Any ideas? Please help.

It's always the antenna mast and never anything electrical.

Jammed with dirts, stripped nylon gears, etc.

The electronics in my 86 went out.
The 3 way switch is usually somewhere in the middle of the dash.
The 3 ways it can be set to is off, mid rise or full rise.
It looks like a narrow window switch.
If you recently cleaned the dash you might have clicked it to the off position. The location should be in the owners manual.