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Is it the switch?

On Toyotas (I know, not a Dodge, but I never dealt with one on a Dodge) there is a resistor coil pack on the inside of the firewall, position 1 on the switch goes to the highest resistor, two to the second highest, 3 to the lowest, and 4 to a direct contact. Maybe you have a resistor pack with a burnt/broken coil?

We would need a wiring schematic to figure that one out.
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