When asking for technical help at the very least let us know the version of firmware you are running.Cliff's Calibration (Mapping) Guide is a MUST READ: http://www.vemssupport.com/forum/index.php/topic,97.0.html
A bad alternator may have fried p259 as it no longer can control the fans relays. Its grounded correctly. Should I have added a heavy duty diode to the relay trigger wire?Since the vems and tach are receiving the signal from msd can I use another source to drive the fan? I have extra ignition pins if its possible. Thank you. JohnP