>>>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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