Hoss,
Here's a simple Pinto Ignition Wiring Diagram:
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pinto.jpg
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Note two wires to the Coil+, the yellow/black from the ignition plus a black from the amplifier. You'll find that the yellow/black goes to a connector, and is a black wire after. That black section after the connector is a resistor wire to drop running volts to about 9V. With your key "ON" you can check to be sure of your voltage before & after the connector. Hope this helps.