very hot alternator

Mr Migwire · Tuesday at 20:31

out pottering around today and visited a friend, was in for a cuppa and a blether about 2 hours in total, came out to landy turned key and nothing, completley dead, stuck jump pack on her and she fired up straight away, drove home about 5 miles and left her running in the drive, popped the bonnet and there was a hot insulation type smell, touched the back of the alternator and then went and got my infra red thermometer, 120 degrees!!!! so whats the cause??? the landy has a split charge system with a battery monitor led thingy in the cab which shows both batteries voltage state but i dont think it works as it was showing both batteries good but when i stuck the meter on them they were both 0 volts. any ideas gratefully received, have disconnected the split charge and am back to 1 battery which is on charge and looking ok, new alternator ordered from JSG tonight. R reg 300TDI.

Tom ferry · Wednesday at 18:29

Mr Migwire said:
out pottering around today and visited a friend, was in for a cuppa and a blether about 2 hours in total, came out to landy turned key and nothing, completley dead, stuck jump pack on her and she fired up straight away, drove home about 5 miles and left her running in the drive, popped the bonnet and there was a hot insulation type smell, touched the back of the alternator and then went and got my infra red thermometer, 120 degrees!!!! so whats the cause??? the landy has a split charge system with a battery monitor led thingy in the cab which shows both batteries voltage state but i dont think it works as it was showing both batteries good but when i stuck the meter on them they were both 0 volts. any ideas gratefully received, have disconnected the split charge and am back to 1 battery which is on charge and looking ok, new alternator ordered from JSG tonight. R reg 300TDI.

Definitely go back to the single factory set up , use the wiring diagram and go through a process of elimination.

See if any of the wires are melting or extremely hot to touch

Mr Migwire · Wednesday at 19:33

Tom ferry said:
Definitely go back to the single factory set up , use the wiring diagram and go through a process of elimination.

See if any of the wires are melting or extremely hot to touch

have stripped out all the split chargs stuff etc and now have a single battery, took the battery from my series 3 and connected it up to the +pos first when i went to connect the -neg got some nice sparks, not the fearce dead short but enough to know there was a load, diconnected the wire from the back of the alternator and tried again, no spark. so i recon something on the alternator has packed in. new one ordered.

tottot · Wednesday at 20:49

It does seem like a break up of the windings/insulation inside.

very hot alternator

Mr Migwire

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Tom ferry

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Mr Migwire

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tottot

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