Hey guys, I'm looking for some electrical expertise. On my 1986 Trans Am I am running a FiTech throttle body EFI system which requires a 12v signal from the ignition circuit via a white 'key' wire. Recently I had issues with the FiTech failing to prime and began diagnostics by jumping the 'key' wire directly to battery. Connected directly to battery it worked perfectly. The battery itself is brand new and tested 12V/600 CCA, alternator is brand new, and new distributor. I used a multimeter to test the voltage from the pink wire that comes from the ignition switch and connects to the 'BAT' terminal on the HEI distributor and found the reading to be between 8-9V with key ON despite the reading at the battery terminal being 12V. I believe this is why my FiTech has been having issues, but I am not certain where to go from here. Anyone have any thoughts?


Visible is pink wire from Ignition Switch, and white wires for FiTech 'key' signal. Green and blue are for Tach signal.

 

Here are the wiring diagrams that I have.

 

Clean grounds, replace battery cables, inspect fusible links. Your juice ain't flowin good.