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Ed
The diode is a system that provides 28 volts to the alternators from the battery in the event the master switch or battery relay goes bad.
If this diode goes short circuit it will provide 28 volts direct from the battery to the main bus bar. There is a fuse also involved which I think is on the front firewall marked GEN that should also isolate this problem.
I cannot remember where the diode is mounted, however a trace using the wire number will find it.
The wire from the battery relay to the fuseholder is KPB13 the other side of the fueholder is KPB14 up to the first diode then KPB20 up to the diode which is more than likely short circuit.
You will need the GEN fuse in for the system to charge.
Let me know how you get on!
Cheers
Pete
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