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Heater blower motor only works when push button is off

(1995 Dodge Ram Van 1500)
in Grayslake, IL on February 01, 2011
When the heater control push button on the dash is "off" the heater blower blows heat, but when I press "heat" or "defrost" it will not blow. When I move the speed control to high the lights dim. ???
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