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tirwin tirwin is offline
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Join Date: Feb 2011
Location: The Forgotten Coast
Posts: 5,843
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Clarify alarm module bypass on SC?

Sorry if this has been asked an answered but I couldn't seem to find a conclusive answer. Most of the posts referencing alarm bypass are for 84-89 Carreras with DME. Trying to find something specific to SC and the posts I've found don't have much follow-up.

In this picture below, I understand the need for the jumper across pins 61 & 61 to complete the charging circuit.

My first question is this -- on an SC, is the 2nd jumper across 30 & 15 needed? Is the alarm module just a relay? Is it an active component that needs power itself? I know it prevents the car from starting by putting a ground on pin 85 of the FP relay. What’s the purpose of pins 15 and 30? 30 is to provide power to the horn?

Second question is if I leave the door & trunk contact circuits disconnected here, will it interfere with normal function? I don't think so, but wanted to confirm. They normally get power from fuse #18 circuit. It appears the alarm wiring is a separate circuit path used to trip the alarm if the doors or trunk are opened when the alarm is activated.

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'83 911 SC 3.0 coupe (NA)

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Last edited by tirwin; 09-07-2019 at 10:49 AM..
Old 09-07-2019, 08:34 AM
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