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Maybe not. If the cutoff is pre-set to 12.4 your wall charger may not supply that much and the unit may never start charging. This is why direct wiring is better, as most cars supply close to 13v when the engine is running. And yes, everyone should own a multimeter. Which doubles as a...

My suggestion is check your battery output voltage. My confusion was that I could not get the LK-530 to work, but my car was off! When I started the car the voltage went up and the LK-530 started working. I think it's initially set at a cutoff of 12.2 or 12.4; so if your car has a low output...

Ah never mind all. It appears that all the box needed was for the car to be on so the power jumped past the pre-set cutoff on the LK-530. Can't test it with a car not running.

Don't you mean 12v power? I'm just feeding the 530 from the lighter socket for now. Next steps: test the cable with a multimeter. Maybe I have to leave a new unit plugged in for a while before it registers anything?

Please excuse if this question has been asked before. I got my 7900 today and installed it, works great. I was trying to use the LK-530 and it just doesn't seem to work. I plug it into the lighter socket (which is active, tested with another device) and it doesn't show any charge coming in or...