12 Oz, what I did was...
Checked lead wires (red and red/yellow) when off the motor - 12.5v when switch engaged.
Checked red lead wire (off the motor) and motor aluminum body - 12.5v when switch engaged
Checked red lead wire (off the motor) and + motor terminal - 6.8v when switch engaged
Checked red lead wire (off the motor) and - motor terminal - 6.8v when switch engaged
Those last 2 are probably worthless.
Anything other I should check?