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On the 83 electrical diagrams here on Pelican there is a connection point for an alarm into the coil/tach wire. Most likely a "factory" alarm or a third party alarm installed by the dealer will use this connection point.
Most after market alarms ground out or interrupt the coil trigger wire. If the alarm installer followed the factory wiring then it's grounding out the tach/coil wire.
As is implied; you will have to trace down the wires and get back to us where they connect and to what color code wire. The color for the factory wire is green.
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
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