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Reply to "No power"

"Before the car is started how does power flow to the ignition switch and fuse box? From the battery I see the big starter wire, and also one wire that comes through the firewall and disappears in the harness."

The description I wrote above is when the car is running and thus I did not address your question.  Before it starts the source of power is from the battery through the 1/4 inch wire that connects at the solenoid.  Power is moving the opposite direction of when the car is running.  The amp meter shows negative amounts when the car is on but not running.

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