Posted by Kentb of SWMO on May 06, 2008 at 05:54:52 from (98.20.114.174):
In Reply to: battery question posted by farm M on May 05, 2008 at 19:51:31:
Allis-Chalmers used positive ground on even their 12 volt systems until they started using alternators. There is one over the road truck builder who the last I knew STILL uses positive ground. Mack I think. big truck alternators DO NOT connect the negative side of the diode pask to the case. It is connected to a NEGATIVE post. This way the alternator can be used with both a Negative Ground system or a Positive Ground system. As said most electronics like negative grounds because the NPN junction transistor is more common, But transistors with a PNP junction are sais to switch faster.
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