Visit yr local old bikes used spare market and look for Honda cd400 rectifier, u will get it for 1k max , ask yr electrician to set or modify yr bike wiring in such manner that it work for yr bike. In my cd185 after converting to 12v , cd400 rectifier was installed and its really good in charging 12v12amp battery.
I am pretty much sure that yr electrician lack proper skills and he wants u to visit him again and again. Did he made a custom wiring for bike or used Chinese copy or just use the old wires with tape.
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