Alternator producing AC current?
 

Ok so I'm off next week and am going to see if I can trace why the ZT battery goes flat after 2 weeks

Doing some initial checks battery at 12.1v starts the car and DC voltage across the battery with engine running is 13.9-14.1v , but on AC it goes from 2.0v to 0.5v every second or so.

If tested 3 other cars and they all give a very low 0.4 v ish steady AC reading.

So is that a sign the regulator is failing and allowing the battery to drain or worse the alternator needs replacing.

I'd rather sort this before I go testing circuits current drain.

Thanks Scott

With your multimeter set to diode function you should only get a reading with the leads one way round between the B+ post and the alternator casing, if you get a reading both ways round your diode pack is at fault and the alternator will drain the battery when the engine is not running.

i have had an alternator throwing out AC - new alternator was required.:shrug:

Thanks for the replies I'll try the diode test tomorrow when i get time

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Thanks think I'll have a look at whether it 2 or 3 wire and get a regulator from DMGRs when I order yet more front drop links.

Easier to try than new alternator.



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I don't think the diodes are part of the regulator. My understanding is they are part of the rectifier.

Mmm that's in the alternator itself right so basically new alternator??? Though the regulator had diodes too??

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Might be of some help.
https://www.the75andztclub.co.uk/for...d.php?t=312171

Thanks but just checked and mines a 2 pin

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