Can somebody point me in the right direction of where my ECM is on my 03 2500 cummins?

Thanks alot guys

 

On the left side of the engine about 1/2 way down...

 

I just got the truck and The ecm was in a box. I have it installed but the plugs are basically the same but have colors on each end. Do you have any idea what order the 3 plugs go on the new ECM.

Thanks alot for any help