Morris, You implied that you tested the spare module on the bench. You must connect the -side of the supply to the case of the module as well as the pin. (this occurs in the unit by its connection to the chassis) If you don't the supply floats and you will only read about 1/2 the voltage out. Corby Dawson ____________________________________________________________ Stop foreclosure. Click here to stay in your home and rebuild credit. http://thirdpartyoffers.juno.com/TGL2141/fc/Ioyw6i3meXw3CZz8xwqTtkGi6BkRjldTPOBgIv377yB4vpUn2bMWB7/