Run & Start for a Sniper or FiTech
DO NOT use the start wire. This is because if you tie the "start" wire and the "run" circuit together, the run voltage will backfeed and engage the starter, anytime the start relay is grounded through the neutral safety switch
First actually CHECK that the "run" line goes dead
I cannot see enough of or read that diagram. The switch in the older cars all had "IGN1" and "IGN2" which you tied together for this type purpose--for EFI or for an ignition that does not use a ballast
I "believe" that the later trucks eliminated this. Does the truck still use the "old looking" style starter relay? If so have him look for a FIFTH terminal on the relay. Use that to supply cranking power to the EFI
If the truck has a starter relay like this........
use the "bal" terminal to supply cranking voltage to the EFI
If not, the bypass circuit MUST exist somewhere. Does the truck have a power distribution/ fuse/ relay box? It may be that the plug in starter relay "if used" holds the key.
WITHOUT A DIAGRAM I am without a better answer
DO NOT use the start wire. This is because if you tie the "start" wire and the "run" circuit together, the run voltage will backfeed and engage the starter, anytime the start relay is grounded through the neutral safety switch
First actually CHECK that the "run" line goes dead
I cannot see enough of or read that diagram. The switch in the older cars all had "IGN1" and "IGN2" which you tied together for this type purpose--for EFI or for an ignition that does not use a ballast
I "believe" that the later trucks eliminated this. Does the truck still use the "old looking" style starter relay? If so have him look for a FIFTH terminal on the relay. Use that to supply cranking power to the EFI
If the truck has a starter relay like this........
use the "bal" terminal to supply cranking voltage to the EFI
If not, the bypass circuit MUST exist somewhere. Does the truck have a power distribution/ fuse/ relay box? It may be that the plug in starter relay "if used" holds the key.
WITHOUT A DIAGRAM I am without a better answer