Mopar crate engine harness

New Hemi Engine Swaps

  1. Buford19

    Buford19 Well-Known Member

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    Where do I connect these two wires coming from the pcm? First wire 16 gauge fuel pump feed: positive output for an electric fuel pump. Next is a 12 gauge cooling fan feed. ( positive output for an electric cooling fan. 30 amp fuse.
    Just to clarify things I just installed a Ron Francis express wiring harness. It has wiring and relay for fuel pump and electric fan. Would this mean I would not need to connect these two wires? Another question in relation with the cooling fan, would the above wire give power to the fan only when temperature is reached, or is it just a power supply?

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  2. Hellcat Cuda

    Hellcat Cuda Well-Known Member

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    I'm also using a custom vehicle harness along with a crate engine harness / ECU system. I'm going to not run the custom system wires for fuel pump and fans. This, I believe is best, so the ECU can control the fans (based on engine temp input) and I'm pretty sure that if you run too low on oil pressure, the ECU will cut off fuel. That's my plan. I'll be verifying this further as I start to wire up my car, but just thinking ahead for now.
     
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    • Buford19

      Buford19 Well-Known Member

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      Thanks for the reply, not sure if the ecu will stop the fuel pump. The fuel pump will still need a relay, that’s why I used the Ron Francis kit. By the way the Ron Francis express is awesome, Very happy with it.
       
    • Hellcat Cuda

      Hellcat Cuda Well-Known Member

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      Yes, I looked into that one and several others before deciding on one called ISIS. The name was later changed when that word became something you'd not want to be associated with. I forget the new name, but the system is pretty trick.
       
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