On Tue, May 24, 2011 at 1:55 PM, Mark E. Skeels wrote: > But if there was something other than three wires it would be > unconventional compared to what I have seen in other installations. That's true, but don't rule it out. Bad installation practices can result in cables being pinched or compromised in various ways. Then of course there are rodents out for a snack. Josh --=20 A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. =A0 =A0 =A0 =A0 -Douglas Adams --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .