Yellow to yellow, there's no wrong order so any yellow male bullet in any yellow female.
Make sure the bullets are clean, the females can be cleaned with a Q-tip if you strip some of the cotton off to get it small enough.
Tighten the females. You can see the open seam in the female's metal barrel. Squeeze gently with pliers so that the seam is between the jaws, not facing a jaw. A bit of masking tape on toothed or jagged jaws protects the plastic bullet cover sleeve.
Smear some dielectric grease or silicon O-ring grease on the male metal tip. A light coating on the female contact and the inside of the plastic sleeve is good too. Make sure they snap together or are at least fairly hard to insert.
All five bullet pairs should get this treatment. These 5 plugs all carry fairly high current and a faulty connection will cripple the charging system.