You know I was just thinking about this just now.....
Check your grounds? Or check to make sure something is not trying to ground out (like a power wire touching frame, battery post touching metal etc).
I came across something like this back in the 80's for for the life of me I dont remember what cause it. I think I had to add a ground wire to something that I added to the car?
Check your wires going to that sub fuse box you installed. Perhaps add extra ground to the frame?
Let us know what you figure out.
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2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor
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