Quote:
Originally Posted by LS short box
Just note on a LS swap you need a 12 volt key on/cranking and key running. Also you need a 12 volt signal constant to the ECM.
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Little confused on what you mean by "you need a 12 volt key on/cranking and key running".
I thought I only needed 3 external wires to my LS harness.
(1) 12V Key Hot (This needs to be hot when the key is on AND while the engine is cranking)
(2) 12V Battery Hot (This is directly to the battery, Hot at all times)
(3) Fuel Pump power out of the harness to power the fuel Pump.
Optional external wires
(4) Trigger signal wire(s) for electric fans
(5) TCC Lockup/Brake Signal