old leafer Posted July 3, 2009 Share Posted July 3, 2009 ok i have a 300 tdi and in the mornings it suffers from a flat battary but if i do high milage it lasts a week befor it goes flat today i noticed that when my lights were on they went bright then dim i think this is the alt working intermitantly am i right before i spend my money on an alt any advice would be very apreciated regards mark Quote Link to comment Share on other sites More sharing options...
bobtail4x4 Posted July 3, 2009 Share Posted July 3, 2009 try putting the battery on charge overnight, once you know the battery is fully charged you can start from there, a common problem with 300tdis is a lazy starter. Quote Link to comment Share on other sites More sharing options...
Aragorn Posted July 3, 2009 Share Posted July 3, 2009 put a multi meter on the battery with the engine runnign and see what voltage your getting. Quote Link to comment Share on other sites More sharing options...
BogMonster Posted July 3, 2009 Share Posted July 3, 2009 From your observation about the lights going bright and dim I would tend to agree its the alternator. Shove a meter on it and see what the voltage is - should be 14V plus with the engine running and then whack a load of stuff on (heated window, main beam and fan on full are a good load) and see what it does - it usually drops a bit but should be still 13.something probably over 13.5V. It might be a dud battery too - discharging internally - but as said if you charge it up and see what happens that would be the best bet. If the alt regulator goes tits up it can also drain a fair amount out of the battery when the engine is stopped. Quote Link to comment Share on other sites More sharing options...
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