isbjorn Posted November 2, 2020 Share Posted November 2, 2020 (edited) Hello. I got a 200tdi 1984 defender. Sometimes when driving (not sure exactly why or when, but I think it might be when accelerating, makes sense to me) the volt meter (Got a madman setup) jumps to 17-18V and stays there for 10-20 seconds. Last time it was accompanied by a loud squealing noise. Sounds like a slipping alternator belt, or failing tensioner, but wouldn't a slipping belt give lower volts not higher? Just realised the truck has a low constant screaking noice as well. But If its the alternator bearing that should result in lower volts... not higher. Any suggestions to what's happening...? Im getting tired of placing the lightbulbs every month. Edited November 2, 2020 by isbjorn Quote Link to comment Share on other sites More sharing options...
Sigi_H Posted November 2, 2020 Share Posted November 2, 2020 (edited) Cool Car. I got an '83 OneTen with 200tdi as well. But my generator is pimped Maybe there are two problems. 17-18 Volts normaly can not occour with a working battery. The bat pulls the voltage down. Prob1: Battery is gone and allows higher voltages at high currents Prob2: Voltage regulator in the gen does not switch off, which is causing the slipping belt and the noise but maybe only the tension of the belt is low Edited November 2, 2020 by Sigi_H Quote Link to comment Share on other sites More sharing options...
Eightpot Posted November 2, 2020 Share Posted November 2, 2020 Sounds like you need to replace the voltage regulator pack on the alternator 1 Quote Link to comment Share on other sites More sharing options...
isbjorn Posted November 2, 2020 Author Share Posted November 2, 2020 Thanks. I'll have a look at the regulator. Quote Link to comment Share on other sites More sharing options...
Peaklander Posted November 2, 2020 Share Posted November 2, 2020 (edited) The voltage variation that you are seeing is exactly what we had with our 300TDi when the fault was the diode pack. It is a very cheap fix of around £10 and with ours the alternator was left in position. There is a thread somewhere on here I think that describes how to do it. The key part is when refitting the new pack, the brushes have to be held in the up position to allow it to be put into position on the alternator. This is done with a paper clip pushed through a tiny hole, which is there for this very purpose. Once over the rotor, the pin is removed and the brushes spring down into the contact position. Edit: I hope this is the same alternator as yours... Edited November 2, 2020 by Peaklander Quote Link to comment Share on other sites More sharing options...
Ex Member Posted November 2, 2020 Share Posted November 2, 2020 Best to not drive it until repaired. You will damage electronics and if long enough, cause the battery to explode. 1 Quote Link to comment Share on other sites More sharing options...
Sigi_H Posted November 2, 2020 Share Posted November 2, 2020 One Ten with electronics? 🙂 ... ok, I forgot the Radio ... Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted November 2, 2020 Share Posted November 2, 2020 As Red90 says, if it's over-volting it could damage your electrics and easily start a fire - the squealing I suspect is because it's trying to boil the battery by pumping 18v into it and putting a huge load on the belt. Quote Link to comment Share on other sites More sharing options...
Ex Member Posted November 2, 2020 Share Posted November 2, 2020 (edited) 1 hour ago, Sigi_H said: One Ten with electronics? 🙂 ... ok, I forgot the Radio ... Pretty much anything electrical can be damaged. It sucks when you need to start replacing everything electrical in the vehicle. In addition to the high voltage, it is most likely pumping high voltage AC into everything. Being in Sweden, he is sitting on the battery. It is not fun when one explodes and catches on fire. There is nothing like a battery box full of hydrogen. Edited November 2, 2020 by Red90 Quote Link to comment Share on other sites More sharing options...
isbjorn Posted November 3, 2020 Author Share Posted November 3, 2020 14 hours ago, Sigi_H said: One Ten with electronics? 🙂 ... ok, I forgot the Radio ... Never had one! 12 hours ago, Red90 said: Being in Sweden, he is sitting on the battery. It is not fun when one explodes and catches on fire. There is nothing like a battery box full of hydrogen. I would never dream of driving a LHD Land rover. 16 hours ago, Peaklander said: The voltage variation that you are seeing is exactly what we had with our 300TDi when the fault was the diode pack. It is a very cheap fix of around £10 and with ours the alternator was left in position. There is a thread somewhere on here I think that describes how to do it. Ill check it. Thanks Quote Link to comment Share on other sites More sharing options...
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