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Having had my battery light come on intermittently whist driving and then lots of strange messages/faults on the dash , I tested the voltage output at the battery with the engine running and had 12.5 volts. Eventually the battery light remained on and I was only getting 11.5 volts so I knew I had an issue with the alternator. Reading other posts and also the Land Rover manual everything says to remove the viscous fan etc. to gain access and remove the alternator . I managed to remove the alternator from the top of the car without touching the viscous fan, the only issue was re-fitting the drive belt whilst moving the belt tensioner. I removed the diode rectifier pack from the rear of the alternator and found the carbon brushes extremely worn with one hardly touching , hence the low output voltage ! I purchased a new pack off Ebay which stated it was correct for the TD6 but it turned out it was not . However with the vehicle stuck in the drive I just de-soldered the brushes and swapped them over , rebuilt and cleaned the 2 x copper slip rings. Rebuilt everything back up and now getting 14.2 volts  Job done and saved a few hundred pounds What I also found after doing all this is that it is possible to access the rear of the alternator from underneath the car and there is a plastic cover over the carbon brush gear that can be removed to check condition. It is also possible to change the diode pack as well without removing the alternator !Just ensure the battery is disconnected when carrying out this procedure
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10th Jul 2020 9:54am
