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Help! 911SC - "CT CAPS" button under dash?!


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I bought a 78 911SC a few weeks ago. The wiring is a complete mess (2 immobilizers from different companies, 1 original looking Porsche alarm and 2 radio harnesses (but only 1 radio!)). 

So..... There is one mysterious round pull out switch underneath the dash with big white text "CT CAPS" on the face of the switch.  Switch has three settings/phases. 

The wiring had been removed by PO so no idea what it connected to. 

Any thoughts/guidance appreciated. 






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