Bad voltage regulator. Replace it. Should be built in the altenator. Or just replace the altenator. Make sure you're battery is disconnected first. Also connect battery back up after you mount new altenator. Note not knowing year of van some older cars have a external voltage regulater. Which means it will be mounted someware on the firewall or inner fenderwall not in the altenator. Make sure you disconnect battery before working on any electrical. This is importent on voltage regulaters. Because they require to be pollerized. Also check battery high voltage will cook a battery.It over charges it.
Protons respond to any voltage, and moreso to high voltage. If a proton is moving away from high voltage, it must be because the high voltage source is positive. A positive will repel a positive. Certainly if the high voltage was negative, the proton would be moving toward the source. The basic laws of electrostatics apply.
Check your switch with a voltmeter for continuity in all positions. Get the electrical schematic to your vehicle to help troubleshoot. The average fan is receiving direct voltage on "High" setting but is slightly cut down in increments on other settings by a resistor or rheostat network. Hence lower voltage produces lower speed. You more than likely have a bad control switch.
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