There is a simpler way to do this, just add a diode negative side to A2 and positive to C2 on connector ''C2'' of the underhood fuse block and you're done.
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Drives 2016 Cocoa Buick Encore 1.4L Turbo auto KL4CJDSB2GB652675
Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716
Never drive faster than your guardian angel can fly