Please help with Grado Cartridge hookup Wiring ???

The Grado has "G" , "R" , "L" and "H" How does this
translate into White , red, Green and Blue. I am getting a background hum with my hook up . What is the correct way . Thanks!
The letters stand for:
G = ground
R = right
L = left
H = hot

The electrical connection schematic for my Grado Reference reads as follows:
Blue = left ground
Green = right ground
White = left hot
Red = right hot

I assume the connection scheme is the same for all Grado cartridges. Hope this helps.
Found this post and great explanation , or not! Gee