so its not really a "hardwire" then. You're using the "cigarette lighter" plug from beltronics and plugging it into an outlet not designed for that voltage perhaps?
2014 Dodge Durango R/T //Diablosports Tuning
2009 E90 N51 /Active Autowerke Stage 2 tune/BMW Performance Exhaust/
1993 Honda Nighthawk 750