It is only a heater so, two wires are ok, Think of it like a light bulb. The heater element is just a light bulb with a big element. Back several years plugs were not polarized and every one just plugged them in. Now they are polarized or 3 prong to make sure you plug it in the best way. They may put the ground plug on so you plug it in correctly to the wall socket. I will have to take a look at mine but I would think there should be three wires, but it may not be required as the truck sits on rubber anyway so it really isn't grounded.
Usually the left blade of the outlet is the neutral side and the right blade is the hot side.
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Ken
2002 F-350 CCLB 4X4, HD4R100 , Riffraff FRx, Riffraff CAC Boots & PRI's, Bellowed Up-Pipes, 4" Diamond Eye exhaust, Powerslot rotors, ATS Ported Compressor Housing, DP Tuner-F6, Autoenginuity, EEC-V Breakout Box, KCM S.S. HPX Line, S&B Filters intake, Quad Autometer gauge pod, Inovations canopy, Banks Big Head wastegate actuator, 6.0L Trans Cooler, Spin-on Transmission filter with custom bracket, Zoo-dad, Dieselsite Coolant Filter, Cobra 29LTD/NW CB, DVD and always looking to do more....  
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