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There are cables connected to what appears to be a bolt, each side of the inner Z plates .
One is red and green/ yellow. the other is red and white /green
What do they do?
I believe these are zenner…
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Zeners
A significant point here is this is a MKIII Commando with original factory wiring. The 2 Zeners are on the alternator side of the rectifier ie the AC side. ALL earlier Commandos (except JPN) and featherbed 12v Machines will have 1 Zener on the DC side of the rectifier.
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Zenners, blue things et all...
Nigel, I would strongly suggest fitting a Trispark rectifyer , or similar and bin all the other gadgets. After 40yrs of Commando ownership I've finally seen the light.!
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I believe these are zenner diodes and using the z-plates as heat sinks.