Maybe the extra two wires are for the power to the heater to come from a relay, so you don't run the risk of burning your biscuits? 
Don't know, never wired one, but just a thought.
short_stuff
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Y2K F250 CC PSD Auto, Short-bed Lariat, Woodland Green/Gold, ordered 07/10/99, born 09/12/99, delivered 10/08/99, Access bed cover, Bed Rug, Zoodad mod, Viper Remote Start Alarm, Fumoto valve, 103K somewhat error-free miles (so far) [never back to dealer for anything]
Repairs: CPS, Water Separator Valve assembly, rear axle bearings, VSS, batteries, brakes, alternator, serpentine belt (x2), driver door pwrlock actuator, water pump
2009 VW Tiguan 2.0 l turbo 200 hp gas engine (TDI engine not available for it yet)
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