Small motor/somthing on the left
Just finishing the last touches on my 1st engine swap. I go to connect the battery and the horn just stays on. I unhook it. Pull the fuse for the horn to see if the dash would light up at least. Nope nothing but the windshield wipers would work.

I have no extra wires on the engine harness other than the few from the A/C delete and Secondary air pump. Including ground wires. I do have the headlight, taillight, both front door pannle wires off all unplugged (paint job). I really doubt that any of this would throw it off but I don't know.

Only other thing was this little guy was going off nonstop when the battery was plugged up.

 

What did you swap?

 

Swapped my 07 renesis with a 04 rebuilt one. Both 1st gens. I'll probably will be pulling the upper intake to see if any grounds arnt tight. It's my best guess.

 

There are additional grounds on the crossmember that the battery/airbox are mounted to as well as one going from the LIM to the body near the air pump.

 

These are the only known wires unplugged

 

I think the first picture is the barometric pressure sensor.
The heavy gauge wire connector is either the fuel pump connection to the resistor or the air pump.

The grounds I referenced won't have wire harness connectors. They'll just have ring terminals with bolts connecting them to the body.

 

That "little guy" is the ABS unit.
You only swapped the engine? Not any of the computer or electronic components? Any blown fuses?

 

Nope. Only thing I did with the ecu was unplugged it. I enen went as far as unwrapped up the old harness & rewrapped the whole thing. No real reason (OCD thing). I'll be going through all the fusses in a few. Yesterday was my only full day off. Wasn't really trying to spend it on the car....

If they are all good. I'll start tarring it back down the the lower intake. Then I should have a clear sight of the harness and ground wires.

Fusses should be good though. Unless that initial time I hooked up the battery it failed. Honestly didn't give them much thought.

Just to make sure. The 3 connectors I have in the pictures above the car should crank and run fine without? Only some error codes.

 

Well all the fusses are good. Pulled the lower intake manifold. Checked all the grounds. the only one out of place was this one

Thick wire under oil cooling line.
It needs to go here.
Ive yet to swap it over. This was the only thing out of place. I'll see it it works when I get off.

 

If you tried to start it with the main engine to body ground disconnected you may have toasted a few ground wires in the process. The starter is grounded with that and pulls a lot if current when it tries to crank

Hopefully it didn't back feed the ECU