Level VI Member
Join Date: Jan 2017
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Quit screwing around with the battery terminal and REPLACE it with a universal one. The terminals like Ford ones may well be tighter than spit and still not grab and the mark of a terminal designed to make you rebuy $150 battery cable sets. The Ford ones I replace commonly get loose like that with only one cleaning of the terminal inside, they allow for zero metal removal at cleaning time. All to make you spend more money.
The universal type will be super tight and do that first as it may well cure your other issues there and maybe $7 total cost. I am forced to do it on every late model Ford I have and they then go back to working fine. Yes, you DO have to cut the original cable but it's that or the complete new one and a LOT more money spent there just to end up back with the exact same problem later and stupid.
You absolutely are screwing up trying to test anything until both those battery cables are good and tight. The cable being loose can also blow out the alternator when it doesn't find a true load to play against there, the battery is the a/c current absorber and the car can blow out other delicate electronics when the rest of the system starts to get a/c going through it instead of the required d/c ONLY. So, only chase other issues AFTER the cable end gets fixed.