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Question about wire gauges in to P1900

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  • Question about wire gauges in to P1900

    Every time I think I have my plan set I come up with new questions....

    I have decided to use my fusebox to power my P1900 - mostly cuz I'm too much of a p__sy to mess with my battery but also so that my dealership can't whine that I've changed my electrical system.

    Consequently I bought two Add-a-circuit components (similar to The plan:

    * connect a switched source with valet switch and a 10A fuse (max the Add a circuit will allow)

    * connect a constant source with a 10A fuse

    * run 10awg wire for both connections above from fuse box to trunk

    * connect to yellow and red wires of P1900

    * ground P1900 to chassis in trunk using 10awg wire

    Does all of this make sense? I've read a couple of things saying that I need a fuse when going from a bigger wire to a smaller one... so would I need a fuse in the trunk where the 10awg wire meets the P1900 14awg wire?

    Thanks as always...