When I google EZ Charge all I get are systems to charge electric vehicles. I do not know what an EZ Charge is in your application. I have seen charging systems that do not show any output until you put a load on them. I presume a voltmeter when connected shows nothing. Measure a battery with a voltmeter and then connect it to the EZ Charge. Now measure the battery voltage again and if it reads higher, that would indicate that the charge system is working correctly. If I am way off base here due to my naivety please forgive me.
Neil & Yoly
2016 Ram 2500HD Tradesman, 2WD Crew Cab, 6.4L Hemi
2018 Travel Lite 840 SBRX