Did it come with a battery originally? If so, it was probably a group 24 12V which would be fine for something that size. The positive wire goes from the converter to the battery, the negative from the battery goes to a frame ground and the negative from the converter meets it there.
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2013 F-150 EcoBoost MaxTow, Roush tuned (415hp 506tq), lifted on 33s, R.A.S.
2013 Jay Flight 28BHS Elite (Equalizer 10K hitch)
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