George,

While I have had the not-so-pleasureable pleasure of working on many a 6.3, I seem to recall that the switch is indeed for the horns. Don't quote me on that though. Your best bet would be to ask Neil Dubey at Star Motors. He knows thses cars inside and out and would be the guy to tell you for sure. His e-mail is n300sel63@aol.com if you wanna try him.

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Rgds,
Aaron Greenberg
MB technician
Precision Motorcars, Cincinnati, Ohio
'67 250SE Cabriolet
'77 450SL
'80 300SD
'85 380SE
'86 420SEL
'89 420SEL
'93 300E 2.8
'74 Jensen Interceptor Mk.III
'81 DeLorean DMC12
'84 BMW 745i Turbo