SOHC.co.uk Forums > CB500/550
Testing Alternator etc
BigAl (Alan):
Just out of interest, what is the field coil resistance on a CB550?...I know the CB750 is around 7.5ohms (4.4ohms on the CB750A)
Bryanj:
Cany remember off hand but download the proper manual from alladibs cave
Mike_Berkshire:
I have tried to access the manual in Alladins cave but for some reason I can open it or download it; I will try again later as our internet connection is a bit flaky and it might just be a connectivity issue. In the meantime, although this is all a bit of a dark art to me, I have tested that the white wire terminal out of the regulator to the field coil is live; it is. The voltage at the earth connection of the field coil is 12 volts too. The resistance of the stator coil windings are between 0.6 Ohm and 0.8 Ohm so there is continuity there but differing resistance. Despite the fact the filed coil is being energised there is no magnetism in the three bolts that hold it to the alternator casing; could it be that stainless bolts have replaced the originals and would that matter? I cant think of what to try next without the manual so I will keep trying to access it or find it elsewhere.
Are the stator coil winding resistances OK?
Mike_Berkshire:
Has anyone used one fo the replacement combined regulator rectifiers like DS sell in this charging circuit and if so what thoughts? An upgrade to a more modern integrated unit could be a good upgrade?
Bryanj:
Disconnect the white wire at reg and check resistance to ground, with power off obviously. The white and green wires have connectors behind the sprocket cover that can fail
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