Take a look at the PDF file attached at the bottom of post #2 in this thread.
http://www.binderplanet.com/forums/showthread.php?t=45293

You should not have any part of the EFI system powered directly from the trucks wiring. You should use relays as shown in the PDF and the wire from the ignition switch that used to go to the ballast resistor simply energizes the relays.

Last edited by Bill_USN_1; 02/23/2013 10:40 PM.
www.Hamiltonfuelinjection.com
http://www.binderplanet.com/forums/forumdisplay.php?f=75
(injection forum)