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Are you getting headlights or you have no power at all?
I see you mentioned a loose battery terminal clamp on the battery post. If you can find a 1/2" wrench, remove those cables, then clean the battery posts and clamps with baking soda/water mixed 50/50, then rinse with plain water, dry off with a rag, and put back on with the battery clamps real tight. If they are loose like that, you can get corrosion in there which will cause this issue. That connection needs to be good and tight.
Then see if the headlights come on bright. If not, the vehicle may have a dead battery and you will need to get a jump-start or a new battery put in.
Give those a try and let me know what happens when you get free time. There is no rush unless you need the vehicle ASAP. Otherwise, if you get to busy, I understand and can wait as needed.
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