Heater switch bypass help?

It all works on the same voltage. It's the amperage you have to worry about. I can't promise that will fix your problem though. Good chance the problem is actually in the blower motor. If you want to try wire it to the blower fuse in the box.

Just as a counter argument for liverhuyen2003. If you are safe and follow basic electrical guidelines then there is minimal chance for a fire. Route all wiring away from heat, and tape off any exposed wire. Like i said, if you are smart about it, then you have the same chance of getting a fire from this as you would from any other wiring in your car. If the switch is off, you won't run the battery down. (current isn't flowing)

Your Thermatic Resistor is bad. The fan needs a source to draw the differing current from. Inline to the switch is such an item. If it is not working properly(or not at all), the heater fan will work only on 1 speed(or in your case, not at all) You should NEVER bypass ANY switch, as they are designed as capacitors also, and by-passing it can lead to shorts elsewhere.

Be careful and make sure you do it right according to the wiring diagram or...Don't do it ! Fire hazard or battery run down. Borrow some money, replace the switch...or check the wiring to the blower switch for loose connection or poor contact before replacing the switch ..