Hi all, I think I blew the diodes in my alternator yesterday, I missed a gear and revved the engine too high, How difficult is it to change the diodes I am electrical just wondered if anyone knows.
Regards Steve Evans.

How do you know they are blown, have you used a meter?
You could replace them yourself, but I would recommend that you go to someone who reconditions them.
I have had parts replaced on alternators/starters only for them to go a few weeks later.
Normally reconditioners give you a 3 month warranty.

I doubt that overrevving could blow the alternator.

Over revving can't blow the diodes but it can damage the rotor windings, I have seen it on Lucas-Magnetti Marrelli alternators especially re-manufactured ones, the centrafugal force breaks the connection between the rotor winding and the slip rings. Usually obvious when you strip the alternator and can sometimes be fixed with just a bit of soldering.



[Edited on 12/11/06 by britishtrident]

Hi I have a digidash that has the voltage readout this is how I know the output is faulty used to be about 14V DC with engine running.

What is the voltage now?
It could still be a knacked rotor/brush

[Edited on 12/11/2006 by nitram38]

Hi battery voltage is all that there is and that went flat in the end.
Steve.