Got a line pump from Ralph\'s in Seatle, good people and a good machine.  Some small repairs here and there, but over all very good.  The one problem we are having is the wiring in the cab.  Someone did some fairly creative re-wiring and even by-passed a few areas.  What I really need is a wiring schematic for a 1999 GMC W5500.  Can any one help???

hey newby those are prototypes set up by skip, great concept but it has been for sale for four years for too much bucks for me. hope that your problems are small and you can get back to pumping like an expert. look at what wires are skrewed with and what color they used to be to fallow the circuit. electrical is big bucks.