07-12-14, 03:26 PM
Changing the starter sounds like waste of time and money to me. If the solenoid is disengaging OK, the motor won't be able to draw any current.
I'd guess the problem is more down to voltage drop caused by the headlight (if I'm right in thinking that's lit all the time when the ignition's on).
Or a duff battery.
What's the actual voltage measurement across the terminals?