charger tray

I've got a redarc DCDC charger and a second battery in my bed. The charger has a wire that is intended to connect to an ignition source so that it knows if the engine is running and will charge the second battery when it is. Has anyone found a good way to connect this to their truck? An open...

I have one of the wireless charger/tray brackets from DirkM with the charger installed and a AAWireless adapter for android auto for sale. I sold my ranger this week so I don't need either of these now. I bought the charger and tray bracket from Dirk several months ago and never installed it...