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454 carbed motor to 454 mag EFI complete motor swap

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454 carbed motor to 454 mag EFI complete motor swap

Old 08-10-2014, 12:33 PM
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Default 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?
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Old 08-11-2014, 05:41 PM
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Originally Posted by 36formula View Post
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
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Old 08-11-2014, 09:01 PM
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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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