HI.
This seems to be a common issue. I do think you have a load on "backside" maincontactor. You tell the beam lights up slowly, and it is because it is connected after main contactor. NEVER EVER connect any extras after main contactor. Always on "batteryside" The capacitors inside controllers need to be charged and that is not possible if you load after contactor. I've seen this several times.
Best regards. MAX
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