Ramps 1.4 with merlin firmware, z axis homes right with inverted up and down (2 replies)

I've been banging my head against this for 2 weeks now and cannot seem to find any a good way to fix this. I have searched all over and seem to find nothing.

What happens is the following.
1. Send my firware from the arduino studio below is part of my configuration.h
2. Run x and y home - both home and move properly.
3. Home Z. Z will home up, then up is down and down is up.
4. /sigh okay, flip "#define Z_HOME_DIR -1" from -1 to 1 and reverse the wire on the ramps board.
5. Home x and y fine
6 home z, z homes but only studders and moves less than 1 full rotation and stops.
7. Okay time to test, send a closed from my end stop where it is.
8. Up goes down and down goes up again....

I'm completely at a loss as to what to do. Any advice would help me a ton, if I'm not reversing my home direction properly let me know.
My printer is similar to an ultimaker where my x and y move my heads and the z is controlled just by the bed (bed moves down)

Thank you in advance,

Sir Ged

#define INVERT_X_DIR true     // for Mendel set to false, for Orca set to true
#define INVERT_Y_DIR true    // for Mendel set to true, for Orca set to false
#define INVERT_Z_DIR true     // for Mendel set to false, for Orca set to true
#define INVERT_E0_DIR true   // for direct drive extruder v9 set to true, for geared extruder set to false
#define INVERT_E1_DIR true   // for direct drive extruder v9 set to true, for geared extruder set to false
#define INVERT_E2_DIR false   // for direct drive extruder v9 set to true, for geared extruder set to false
#define INVERT_E3_DIR false   // for direct drive extruder v9 set to true, for geared extruder set to false

// ENDSTOP SETTINGS:
// Sets direction of endstops when homing; 1=MAX, -1=MIN
#define X_HOME_DIR -1
#define Y_HOME_DIR -1
#define Z_HOME_DIR -1

#define min_software_endstops true // If true, axis won't move to coordinates less than HOME_POS.
#define max_software_endstops true  // If true, axis won't move to coordinates greater than the defined lengths below.

// Travel limits after homing (units are in mm)
#define X_MAX_POS 400
#define X_MIN_POS 0
#define Y_MAX_POS 310
#define Y_MIN_POS 0
#define Z_MAX_POS 300
#define Z_MIN_POS 0

#define X_MAX_LENGTH (X_MAX_POS - X_MIN_POS)
#define Y_MAX_LENGTH (Y_MAX_POS - Y_MIN_POS)
#define Z_MAX_LENGTH (Z_MAX_POS - Z_MIN_POS)