Hemi swap 6.1L Turnover, Pause Start Issue

1...Are you sure faulty spark timing is not kicking the starter? Disable the ignition and crank it to see

2...If not I would Make up a lead so you can jumper power direct to the start solenoid. This will bypass all harness wiring and quickly get this down to the starter, cables, battery.

3...Even if you have to borrow, if necessary, clip voltmeters to various points in the battery / starter system so you can monitor what is happening. Frankly, for something like this an analog meter might be better, as you can quickly see by needle movement what is going on.

Start with a meter right at the starter big stud and ground. If that shows a big drop in the problem, leave one lead on the stud, move the other to the battery clamp or post. If this is a rear mount battery, get "any" wire, no 20 or larger to use as an extension. I have even "hacked" extension cords. You can hack a cheap lamp extension cord in half to get bare ends, then extend them with a longer cord That way, you can hook to a trunk mount battery and have your meter(s) up front while you are jumpering starter etc.