JDav's MK4 #9028 Build Thread

[edwardb]

According to the guy I spoke with at CobraHeat, the switch is just a standard 3-way. But I'll do some additional bench testing to make sure everything is in order. Thanks for the watch out.

Sounds good. That's the first I've seen of an actual schematic for the heaters. Their instructions don't include one. I've wondered exactly how they switch between high and low. Always thought there was some kind of dropping resistor in the circuit, but never saw anything like that in the harness and wasn't sure exactly what the relay was doing although could hear it clicking on the low setting. Studying the schematic, now see they have the pads in parallel for high, and in series for low using the relay. The resistance of the pads themselves is obviously enough to effect the low setting. Interesting. Maybe I'm the only one that didn't know that.