AJS & Matchless Owners Club

My Wassell-style electronic regulator/rectifier packed up recently. I gather others have had similar failures.
Interestingly, the cause might be something else: I was surprised to find that my alternator stator was shorted to earth!

If that happens, uncontrolled current will flow in the rectifier - and presumably cause it to fail eventually.

I found some cracked and broken-down insulation in the alternator stator and have been able to successfully repair it. It's now showing several megohms of resistance to earth (as it should).

Upshot: if you've got an electronic regulator/rectifier, it's probably a good idea to periodically check that the alternator stator is free of any short to earth...

Get yourself a voltage regulators D V R 2 , solid state they are suitable for 6 or 12 volts and will fit in the old Lucas cut out box if you want to hide it.

bitza wrote:Get yourself a voltage regulators D V R 2 , solid state they are suitable for 6 or 12 volts and will fit in the old Lucas cut out box if you want to hide it.

They are only for dynamo's and not the alternator that Clanger has.

Fine with that my error.

Just to close this one out: I successfully repaired the faulty stator insulation and replaced the damaged electronic regulator with a new Wassell unit. All working fine again.
The stator insulation was cracked in various places.
Stator with new insulation. The coils were also re-wrapped with Kraken tape to keep everything together.

Great result not to expensive.