Tyrell Corp wrote: What if you refit, then power up the starter,with jumpers from B- to motor earthpoint and B+ direct to starter terminal, other battery terminals disconnected -does it crank?
if yes and it cranks ok, but problem persists when battery terminals are re-connected then your fault lies somewhere within the wiring to it.
Re-chcek the starter fitted with the jump leads only: what could be drawing far too high a current when trying to turn the engine might seem to work fine on the bench with no load.
I did all this and got it to crank, using jumper cables, bypassing the starter solenoid. I have no idea what changed..
It sounded weak, but my battery is starting to drop voltage (down to 11.9volts now).
I guess next step is to replace all the wiring and solenoid between the battery and starter?