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If you look at your wiring system you are providing power to everything. But just as important is the ground [-].

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In an odd, way, grounds are more important than + voltage. No voltage, no output. If you have voltage but bad grounds, though, that voltage will find a different path to ground, and that's where some wierd stuff can happen.

And FWIW, that blue/black ignition feed shown in an earlier post is an adversary to us all. It connects to almost every ign-hot item, it reaches from the alternator to way up under the dash, yet it has no fusing on it whatsoever. At least my 70 300 didn't. DAMHIK.

Anyone doing extra wiring, wiring repairs, or just loves their car should review that circuit in a FSM and put an inline fuse in it somewhere!