I checked in my owners manual and also di a quick search on the net to see if i could find a diagram showing all of the grease fitting locations for my 1999 Blazer LS, ZR2

Any here that can post a diagram/drawing of the location of the grease fittings?

 

I can tell you where they are but i do not know of any diagrams.

These are all of the possible locations, the fittings may not be there if the component has been replaced with an aftermarket one of that design.

1) upper and lower ball joints both sides if the fittings exist they will be on top of the ball joint.
2) inner and outer tie rod ends
3) idler and pitman arm
4) u joints (if replaced with an aftermarket design)
there should be 9 fittings on the front end and up to 4 more possible in the u joint

 

brian is correct except there should actually be 11 zerks on the front end 4 balljoints 4 tie rod ends 1 on pitman arm 2 on idler arm

 

He has a ZR2 so add one more for the steering stabilizer. And I believe there is only one on the idler arm, at least there is on mine.

You might have two more on the anti-sway bar if aftermarket bushings have been installed.

 

idler arm definitely has 2 depending what skid plate you have it may need to be removed to access the the one towards the front