Mike,
Does the 'mystery' box under the seat have the mfr markings ... is it made by Hella? Size sounds too big to be a factory alarm unit by Hella.
One of the few electrical items that the Bentley manual documents well is the factory alarm unit.
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Warren Hall, Jr.
1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
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