I have fitted a kill switch in series with the stop solonoid and I now seem to have an intermittent parasitic draw which drains the batteries in about 2 hours.
I have also recrimped a connector going to the blower motor.
It's failed to start 2 since fitting (battery at 11.5v) but has started about 5 times. All within 48 hours! When running charge voltage is normal.
I've pulled every fuse and but no current drop on any of them.
Could the immobiliser (behind the dash as I have bypassed the one in the battery compartment) cause the problem?
Any advice?

I would suggest removing the modification (which will probably make no difference) then working out what got "broken", fix that, then re-install the mod!

Theyre not as cheap as they used to be, but that UNI-T company make a low current DC clamp meter that's great in tracking down stuff like this. Other companies make DC clamps, but most only start at higher currents.

Thanks @julianf !! Will order one and have a go! I am somewhat disinclined to take everything out again as I soldered it but needs must...will update later if I make any progress.

julianf said:

I would suggest removing the modification (which will probably make no difference) then working out what got "broken", fix that, then re-install the mod!

Theyre not as cheap as they used to be, but that UNI-T company make a low current DC clamp meter that's great in tracking down stuff like this. Other companies make DC clamps, but most only start at higher currents.

Click to expand...

Turned out to be the Glow Plug Relay. Thanks for your help!!