How to Convert Your Positive Earth Sereis Land Rover to Negative Earth
If there are two independently operated wiper motors mounted on the windshield of your Land Rover, it was originally manufactured as positive ground. If a single wiper is mounted in the dash, it was manufactured negative earth.
Here's how to do it:
Disconnect both terminals of battery and remove interior dash panel.
Reverse leads on amp gauge (it will read upside down otherwise).
Reverse leads on ignition coil (the coil takes 12 volts and turns this into about 60,000 volts, and if polarity isn't reversed, you lose 40-50% of coil output).
Connect ground cable to negative terminal of battery. We recommend good ground for a cold start Ü have two ground straps going into negative terminal. One lead is attached to chassis below the battery box; the other goes to the block at the 5/16 bolt th at holds the support for the oil filter tube.
Next, go to generator - look at the back: the smaller lead is the field wire. Now, to polarize the charging system, run a jumper wire from the positive terminal down to field terminal on the generator - hold it only for a second or two (you'll get a spark).
After removing jumper wire, connect power from solenoid to the positive post of the battery, and you're finished: your Land Rover is now negative earth.