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Old 02-26-2015, 07:34 AM   #3
1project2many
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Join Date: Mar 2012
Location: Lakes Region NH
Posts: 3,217
Re: Help with deluxe 57 heater switch

If you're talking about the fan switch, the original application used resistors between two of the "connectors" on the switch. This is a car switch but it shows the resistors.


Low speed routed current through both resistors, mid speed routed current through one resistor, high speed was a direct connection between wires. It's possible that someone intended for a new switch to be used with a blower motor with three windings to provide three speeds without resistors. This is a common strategy with bus and motorhome heaters.
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