13420091, Great question. I think it comes down to the manufacturer... Posted by Dstl1, Tue Jan-12-21 02:38 PM
I’ve seen some that were powered on at all times and some that weren’t. So, someone had the thought to run it through the ignition, while some are connected to b+. I also had someone tell me that it was always powered, for memory reasons, but we disproved that one, at a dealership I used to work at.
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