SOHC.co.uk Forums > CB500/550
Testing Alternator etc
Mike_Berkshire:
--- Quote from: ozzybud on February 04, 2025, 03:34:28 PM ---First check that the field coil is getting energized with the key on engine off. Take the left honda nameplate off.
With the key on the three screws should become magnetic. Check with any steel object. The fiels coil is fed by 3 yellow wires #6 in diagram.
--- End quote ---
I had a spare 5 mins last night so nipped into the shed test if the screws were magnetised when ignition on; they were not. I am assuming it is the three inner screws you mean; the ones that sit in the counterbored holes?
Bryanj:
Try putting a jumper wire from battery positive to the white regulator wire and see if they magnetize then, if yes reg or wiring if not wiring or coil
Mike_Berkshire:
Cheers Bryan. I’m capable of that and will try and find a few mins to do that tomorrow.
Mike_Berkshire:
Rather than fit a jumper cable fro the battery I probed the white wire at the regulator. It was showing 12 volts but not magnetism at the alternator screws. I’m polishing the wheel hubs now to get ready for wheel rebuild so once that’s done I’ll get back on the alternator.
Oddjob:
I’d check there is still 12v on the white cable where it joins the field coil. If there isn’t then there’s your problem. If there is then maybe the field coil has failed for some reason.
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