I would not be to concerned about the earth wire as it's attached to a great big hunk of steel. So as long as the engine has sufficient earthing it should be fine. Having said that you can never have to many earths on a D1. Earthing issues are a common problem.
Not sure about the Diesel model but the V8 has a starter relay behing the drivers kick panel that could cause problems. I also had a battery lead that went high resistance under load. Have you tried running jumper leads directly to the starter from the battery.
Cheers, David.
My Land Rover has made me a better Mechanic........
D2 TD5 Manual, CDL, Detroit Rear, Truetac Front, 2" OME lift, 32" MT Tyres, ARB Bull Bar, Winch, TJM Roof Rack, Driving Lights, Dual Batteries, ARB Side Steps, Rear Draws, Uhf.
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