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-   -   454 carbed motor to 454 mag EFI complete motor swap (https://www.offshoreonly.com/forums/restorations-upgrades/316599-454-carbed-motor-454-mag-efi-complete-motor-swap.html)

36formula 08-10-2014 12:33 PM

454 carbed motor to 454 mag EFI complete motor swap
 
I've swapped out my 454 carbureted engine with a complete 454mag EFI, I thought this was connect fuel line, plug in engine harness and it should run right! I have spark, fuel pressure, but no power to the ECM? I'm looking for a wiring diagram to find ECM power supply, and ideas?

AllDodge 08-11-2014 05:41 PM


Originally Posted by 36formula (Post 4168616)
I've swapped out my 454 carbureted engine with a complete 454mag EFI, I thought this was connect fuel line, plug in engine harness and it should run right! I have spark, fuel pressure, but no power to the ECM? I'm looking for a wiring diagram to find ECM power supply, and ideas?

Fuse is blown or something is not hooked up. I did same thing only changing to EFI 502. Here is the wiring diagram
http://www.boatfix.com/merc/techbk/96/96hgd4.pdf

36formula 08-11-2014 09:01 PM

Thanks, that will help a lot! I had looked at the fuse, and it looked ok, but I didn't put a volt meter on it!


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