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1991 964 warning buzzer w/ all lights coming on

Electrical and Electronic

Vehicle Information: Year: 1991; Body Type: Cabriolet; Total Mileage: 42344;

I have some of the usual problems that are addressed on this board but how about this one. Occasionally, usually when ambiant temp. is low and heater is on, all the warning lights will come on and a shrill alarm will sound. it will start out sort of slow and low and within 5-8 seconds be loud as can be. If I turn off the key it will go away , sometimes not to return until next time. I can take a 400 mile trip and will only come on once, and then take a 20 minute drive , and it will happen 3 times. I have already done the 45K service, oil level is fine, nothing is wet, battery voltage is up, I can't for the life of me understand this. Thanks in advance.

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