SOHC.co.uk Forums > CB350/400
Defective battery or charging problem or other?
cliff7:
Poking my nose in, after similar problems found this helpful:-
http://manuals.sohc4.net/general/motorcycle_electrics/HondaMES3.pdf
Forget first page.
billdn:
Cliff any help appreciated, will read link but can't say I'll understand it ;)
Bryan - I've repeated earlier test you asked and values shown as follows(previous in brackets)
Battery volts engine running 12.47v (12.2v) with negative probe on battery and pos on white wire to block 3.3v, no previous ; pos on black in headlight 12.12v ( 0.73v) ; pos on black ignition 12.16v ( 0.73v); pos on ignition red 0.05v ( 0.49v) so cleaning up ignition switch may have done something?
Cheers
Bill
Bryanj:
You should still have a higher voltagd on the white wire, more or less full battery voltage after startup.
There are two sets of contacts inside the reg box, or rather one moving one that connects up or down depending on battery voltage. It could be that one of those pairs have high resistance and need cleaning, same as engine contact points realy they can oxidise when not in use
mike the bike:
As I said; short black and white together. This bypasses the questionable voltage reg and supplies the full 12V across the exciter coil. All being well, it should now charge, so replace the voltage reg.
If it doesn't charge, then the fault is elsewhere.
billdn:
Bryan - removed regulator, gave points within clean with fine wet/ dry ( dry obviously) and a good spray with electrical cleaner and put back on , no change or possibly lower value on white than before, tried Mike's suggestion and charging ok , so possbly u/s regulator.
A combined rectifier/ regulator is cheaper than new regulator from DS any thoughts?
Or try and source second hand unit from Steve and 400/4 bits.
Cheers Bill
P.S. horn now works - loose wire oops!
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