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Actually, I have not even installed the dual battery wiring yet, Just testing the tray install with the primary battery hooked up

I installed a dual battery box on my 2018 Jeep Wrangler Unlimited 4dr JK. Now it won't start. It cranks but down't seem to fire. I have removed and replaced the whole thing 3 times no broken wires or loose connections. I have checked for blown fuses but don't see any. The engine code were...