74 duster elelctrial help

We can use the schematic to understand how the circutis work and what to expect.

For example. What wires and circuits are hot with the key off?
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What happens if we open the door and step on the brake pedal leaving the door open?
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And here's how the circuits work with the engine running and the battery recharging.
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Knowing what the ammeter indicated before the fuse blew would help us figure out what is causing the line to have more than 30 amps go through it.