HELP! Momentary Electrical Shutdown Stops Engine Dead

It's a '95 900 Turbo Convertible, and I love it even so. Sometimes, when you put a surge load on the electrical system, as by applying brakes, pressing the electric window button or hitting the A/C, the system voltage either drops severely or momentarily cuts out completely -- for a split second only, but enough to shut the engine down. Confoundingly, the problem is intermittent. I put a new battery in, and the problem went away, but returned a month later. It's got a brand new Delco alternator, which maintains 14 volts with a mild load and drops to about 13.6 with lights and all accessories running. When I clean every ground and hot connection I can locate, including the battery terminals, the problem sometimes ceases for week or so and returns. This, despite the fact that I've run a "sister" cable from battery ground to the engine, and have cleaned the battery ground-to-chassis connection more times than I can remember. Is it possible that there's a faulty circuit board that intermittently goes fritzy when the voltage drops? Anybody?

Reply to
DConklin
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Sounds like the good old ignition switch malady, done loads of them for the same symptoms, allow 2 hours and £100.00 for the switch.Regards, Tom.

Reply to
Tom

I've just had this exact same problem - the mechanics have diagnosed it as the electrical half of the ignition switch, which is being replaced right now. It was nice to be able to point them in the right direction after reading this. Thanks for your (indirect) help!

absgt

1997 9000 CSE
Reply to
absgt

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