4.8is no start, only one click.

[Kingfisher]

Having a starting issue here car won't crank, it only click once when turning the key. I tried 2 brand new batteries so it's not a battery issue. I can hear the fuel pump working and everything and the car DOES and only start with a jump from the jumping terminals.

Today I got the starter replaced with a new one but that didn't fix it. Still the one click. Old starter did test good at the Auto zone. Battery terminals are measured at 12.7 volts, the grounds measured the same. There is significant power draws from the battery after a couple of tries.

Any ideas what else I should look into from here? EWS, DME? How do you properly diagnose those modules? Thanks!