Thank you everyone for your advice.
I’ve been able to fix the problem. I took the following measures:
(1) I connected the pigtails in the picture above (white cable up and brown cable down) to the connector hookup on the negative terminal but the battery drain problem persisted.
(2) I took the battery to a technician for test. I was told the cells were bad and needed a new battery.
(3) I got a new battery and installed the pigtails wrongly as stated above since I had not figured out the correct connection. My vehicle came back alive but was having a wiper malfunction.
(4) I researched further on the forum and got a perfect advice from
@chucksbp - trust me, he is an expert! I reversed the pigtails and my wipers started functioning well again.
Now, my vehicle is in a perfect working condition.
I can’t thank members of this forum enough for not only saving people from unnecessary spendings and visits to the dealers and technicians but the disappointment of not enjoying our precious cars.
This forum is a must for every Ford owner👍