Just added a $40 heater to the deluxe cab of my 825i. Didn't like the idea of losing my glove compartment(or the $500) with the JD stock heater. I know it is not the same class of heat, but was surprised at the amount of heat it did produce. Nice feature too, is that it starts immediately, instead of waiting 10 minutes for the engine to warm up. A lot of my trips are shorter than that. Used some 3M super tape(doubled sided) to just mount it under the dash, and a 40 amp continuous duty relay driven from the ignition so that I didn't forget and leave it on and drain the battery. I ran the wires under the center floor console, and tied the relay in to the overhead cab wiring(coil) and direct to the battery(load). Model I used was RoadPro RPSL-681 12V. It is only 300 watts, but makes a difference.
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