Magneti-Marelli Alternator Failed

I think my alternator has failed. While driving the battery warning light came on then started flickering, also the rev counter stopped working. I have checked the connections and all looks well. I have also checked the 100A fuse.

I have now removed the unit from the vehicle, any ideas on how to fault find. I have checked the brushes and they look fine, I suspect the diode or voltage regulator.

Any ideas more than welcome, or it is 170 for a new one :doh:

Ta!

you need specialised test equipment if you want to test each part! its probably the regulator that has failed. you can have your alt reconditioned for less than a new one but you would get one even cheaper from a breakers or fleabay.the bosch ones are a better alt and easier to fix if they go wrong.

Look in the Q's and A's - there is a link into Alternator testing there.

Take it to an auto spark - £40 to rebuild it.

Or order up a reg pack for a £5 and try that - would be worth doing the brushes while you're in there - well would be worth doing it all really - kit's from auto electric shops online - there are also guides out there if you google them, inc. how to change the bearings and all.

Most expensive Magneti here is 139 plus VAT - and it is Magneti alt's they are selling.

- Engine_Parts

Thanks for all the replies. I will get it tested and then decide what to do next.

Got it tested, it was the rectifier/regulator. A new one was only £30 more than getting if fixed, so I have a nice shiny alternator bolted in and working!