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Does the shut off have to tap nto the ECM? Once you tap that wire, it will throw codes left and right because the resistance has changed.
If it is a kill switch, I suggest either installing on the lift pump since it only gets a 12 volt voltage and the ground is signaled from the ECM. Other option is the ECM fuse in the fuse box for it gets only a 12 volt signal. That is all the ECM is looking for.
Last is just tapping directly on the ignition switch. These will keepo the vehicle from coding.
If it has to be the ECM, It will be pins 91 and 69. Pin 91 will have a Br colored wire and 69 will have a LR colored wire. 91 is positive in and 69 is ground out.
If you decide to go off the ignition switch, yellow wire is your positive feed and the white will be ground.
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