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Far from an expert here, but I seem to remember reading somewhere on this board that the WUR and AAR get power from the same relay as the fuel pumps. If that were not the case, they would begin to heat even before the engine was running, and leaving the ignition in the on position for a few minutes before starting could put these devices into "run" mode while the engine was still cold.
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Jacob
Current: 1983 911 GT4 Race Car / 1999 Spec Miata / 2000 MB SL500 / 1998 MB E300TD / 1998 BMW R1100RT / 2016 KTM Duke 690
Past: 2009 997 Turbo Cab / 1979 930
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