| Because everything is fused (and/or has fusible links). If you add 15A onto any of those you risk blowing the fuses. Putting in a larger fuse is a bad idea because then you will overload the wiring. The best bet is to put a new wire in from the battery (fused) to a new relay (mounted wherever, if you can pick up a relay from a relay box on a junk Z you can put it in the relay box), then pick up an ignition wire from the relay box to activate your new relay.
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