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hardebeck's Avatar
 
Join Date: May 2018
Location: Phoenix, MD 21131
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Mystery black box

Changing out master cylinder in my 78 SC and found this bakelite box tucked down near the AC ducts. Pretty sure it's not factory, no markings other than a number scratched on the front. 9 white wires go to a harness that disappears into the nether regions.
Alarm system or immobilizer installed by a PO? Anyone recognize it? It's not sealed very well and there's a bit of corrosion on the PCB so I'd prefer to just remove it if it's not doing anything useful but before I do thought I'd ask the collective wisdom first. TIA.
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1978 911SC 3.0, 163K+ miles, Copper Brown Metallic
Old 08-18-2019, 11:59 AM
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yup get rid of it.Just follow the wires and see where they end up at the fuse box.My guess is by the fuel pump fuse..
Ivan
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1985 911 with original 494 340 miles..s..795 563 km
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Old 08-18-2019, 12:04 PM
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Location: Manhattan Beach, California. Factory Delivery-Original owner-Retired engineer
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Mystery box.

Open the white connector, and check for any start-up
issues.

Based upon the number of IC's this may involve
some type timing circuit.

Yes, proceed to the fuse panel connections,
and, the other (?) door switches(?), trunk(?) connections.

Before you disconnect any of the above,
document the wire colors, and the connection points.

pm me as needed.

Best,

Gerry
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Old 08-18-2019, 03:46 PM
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Meh, I probably wouldn't worry about it. Unless.... I was being tailed by 4 ugly Dudes that were high level drug dealers in a big Ford station wagon.
Old 08-18-2019, 05:04 PM
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Look under the driver side dashboard. My guess is those wires pop out under the dashboard and are tied into the ignition circuit. My car had an aftermarket alarm like yours and the wires were spliced into the heavy gauge yellow wire along with a relay.
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1987 911 Carrera coupe - Guards Red
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Old 08-18-2019, 08:38 PM
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