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Anti Theft System


Vehicle Information: Model: 911 sc ; Year: 1983; Body Type: Targa; Total Mileage: 166000;

I have recently reactivated the factory installed anti theft system on my 1983 911SC. I have located alarm control module. It seems to be working, it activates from all doors, luggage compartment, and when the ignition is engaged. I hear the control modules alarm horn relay actuating. The control module alarm horn relay contacts are working properly. The problem I am having is that the horn is not sounding when the alarm is activated. The car is prevented from running. Based on voltage measurements it appears that the control modules alarm horn relay output is 12 v DC. I have three questions 1 Is there a separate/independent alarm horn? 2 Is there an interposing relay that activates the cars horn? 3 Where should I look? In any case I am unable to find the other end of the control module alarm horn output wire, red/white wire. Thanks

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