[alfa] What is this box

[Ed Lutz <edlutz@xxxxxxxxxxxxx>]

On a '74 Spider there is a silver colored box mounted under the dash, on 
the right hand side, just behind the dash air vent. It says Bosch on it 
along with a part number (I didn't get that off it yet but I can). There is 
an electrical connector coming off the back side. Can anyone tell me what 
this box does, its purpose in the Alfa world? Mine has been sitting there 
quietly doing whatever it does up until last night. I came out to my 
Spider, it was cold and damp, around midnight, and the car had been parked 
outside at work for about 53 hours. I started the car and the box started 
buzzing. The buzzing changed speed with the engine speed and stopped when 
I'd put the motor under load. Almost as if this mysterious box was reacting 
to engine load, perhaps fuel flow? By the time I got home and the heater 
had done its thing the buzzing was pretty much gone but this morning it was 
back a bit...then gone again. Strange...
Everything else works fine, the car still runs as wonderfully as usual. Any 
ideas on what the buzzing could mean?

Ed
Loveland, CO.
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