have a 05 dodge 1500 4wd with a 4.7 the engine blew up so I put a 06 5.7 hemi in it was not able to get the pcm nor the harness with it. Bought both the pcm and harness on ebay installed it tried to start it started for 4 to 5 seconds and died. Noticed there was a fuel leak fix that and retried and it run a little longer and died. No I tried to restart it and it will not do anything when you try the key to start it I hear the fuel pump prime the system but that's it nothing like theres no power go to the starter at all can some give me a help hand thank you

 

Battery good?

 

How many grounds did you connect? The starter gets its ground from the engine block. The hemi has 6 ground points that I can think of.

 

It’s possible you need your pcm calibrated/ programmed

 

I would most definitely check all your grounds..i have a 05 that had a 4.7 .blew it.an I installed a 5.9l. ...I would check the grounds on the heads to firewall..plus I have a 03 dodge Dakota, an I M almost done with starting it with a LS engine 5.3 in it..lol.just stand back for a second an look at everything..you be surprised at things u might have missed