>>>Negative ground systems are most common
>>
>>I'm not much of a car mechanic, but didn't they used to ground (to the
>>chassis) the positive side of some cars' electrical systems? I seem to
>>remember (from 40 years ago) being told never to jumpstart two cars
>>while their bumpers were touching because some cars grounded one side
>>and some grounded the other side and you were likely to make more than
>>just the starters jump. I know this has no bearing on UPS systems but
>>I'm curious. >-
I don't remember when they changed but Fords were the only domestic car with positive ground when I
was a teenager.
Sheridan
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