I have a 2019 Pioneer 1000-5, I added a dual battery with Tru isolator had no problems for 2 years . But now when I try to start it I get no power, the batteries show 12.6 volts but the light on the isolator kicks on once in a awhile then i get a little crank not enough to start. I checked all the wires all are tight. When the isolator kicks in I hear a click then the light goes off. I am thinking the isolator has gone bad. Am looking for any ideas as to what may be the problem.