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My ford windstar has a similar problem with the UltraGauge. If you go out to the car and open a door for more than a few minutes without starting it, then come back in the next two days or more, the battery will drained with the UG installed. Without the UG installed it doesn't seem affected.
Obviously the UG doesn't draw enough power on it's own to drain a large car battery. I think the problems is tied into a circuit in the interior lighting system to auto turn off the interior lights after 7 minutes. I know that I have fooled it with a trailer hooked up. You turn out the lights to park the car with the trailer attached and after 7 minutes the car lights come back on. In all other respects the trailer lights work perfectly. I am pretty sure that the Ultra Gauge does something similar.
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