[Jazzbass]

Originally Posted by Bird watcher

Hello folks, after a number of gains on rewiring the alarm on my 1986 911, all but one circuit has logic out with my test light.

The Bentley manual instructs: From the alarm module (Anti theft control switch) bridging female connector pin 15 and 31, test light should go (out) when the ignition is turned on. Instead the test light go (on) when the ignition is turned on. Following the power distribution diagram page 970-8 circuit (C) from ignition continuing to page 970-10 Circuit (C) when the ignition is turned on it seems to to power up pin 15 on the module, and most of the instrument cluster.

Could this be a type-o on the part of the manual, or am in reading the circuit wrong.

Help!!!!! John..

Pin 15 of the alarm module is connected to main power bus 15 of the car. Bus 15 is switched power directly from the ignition switch and is hot in the "RUN" and "START" key positions. You should most definitely have voltage at pin 15 when the ignition is turned on (light on). If Bentley says otherwise it's typo. The Bentley manual is well known for that. Pin 31 of the alarm is ground.

[Bird watcher]

I finally got my reference sensor pin installed, and had another look at the sensor connections. Not as bad as I first tought. The connector from the speed sensor was broken away and left brittle plastic parts insude the female connector of the wiring harness. I was able to use a jewlers screwdriver to pry them out, so no need to replace the connectors on that end of the harness. When my new speed/refrence/head temp sensors come in, it should be just route and plug in. Still need an alarm module; anyone have a good one for an 86 911 Targa willing to sell. Need to get her started before I go full force into bringing her back to life.

[Bird watcher]

Chris. Thanks for the confermation. your reply wrapped over to page two and I missed it earlier. With that, final logic of the alarm is completed. Most of the faults were associated to coroded ground points, the two doors contact switched just needed to be sanded to clean metal, and one of leads needed to be rewired. also one of the leads was switched around in the DME relay Connector. Trying to source an alarm module on ebay.