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The complete census of globular clusters formerly belonging to the Sgr dSphand now deposited into the Galactic halo is an important contribution to ourcomprehension of the evolution and disruption of this dwarf galaxy. Weinvestigate in this study the possibility that the poorly known "old" globularAM 4 might be associated with the Sagittarius dwarf galaxy, and at the sametime provide more solid estimate of its basic parameters. New high quality BVIphotometry is presented, from which an improved Color Ma gnitude Diagram isconstructed, and estimates of age and distance are then derived. The distanceand Galactic position are finally investigated in details. AM~4 is found to bea low luminosity (M$_V$=-1.82) cluster undergoing strong tidal stress by theMilky Way and on the verge to be dissolved. Besides, and at odds with previoussuggestions, we provide evidences that AM 4 is indeed young, with an age around9 Gyrs (as Terzan~7), but somewhat more metal poor ([Fe/H=-0.97]). AM~4 islocated at 33$_{-4}^{+3}$ kpc from the Sun, in a direction and at distance nottotally incompatible with the Sgr dSph stream. Although we significantlyimproved our knowledge of AM 4, further studies are encouraged to obtain radialvelocity and metallicity to d emonstrate more firmly (or deny) the associationto Sgr

The globular cluster AM 4: yet another young globular associated with the Sgr Dwarf Spheroidal galaxy?