SOHC.co.uk Forums > CB350/400

Defective battery or charging problem or other?

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billdn:
Having been locked down and then trapping a sciatic nerve for weeks have been unable to ride and battery appeared to have died. So battery recharged but all is not well. Battery after charge read 12.35v, installed and run okay but horn wouldn't work when running but when engine off but ignition on would, for starters. So tried charging volt test as per Haynes manual(all I have) Results dont seem right
1200rpm (tickover) =12.34v
2000rpm  = 12.2v
3000rpm  =12.2v
4000rpm  = 12.22
 Lights on
1200rpm  = 12.13v
2000rpm  =12.6v
3000rpm  = 15.5v
4000rpm  = 12.3-15.5v (erratic)
With engine running and lights on voltage at same revs as above was consistent between 12.3 - 13.6v but when pressing horn just a faint short beep

I've checked continuity on horn -ok and cleaned up earth where bolted to coil on l/h/s of frame.
The rectifier has continuity too and the voltage regulator - gaps and connections appear in order.
The voltage regulator check mentioned in Haynes , is confusing me (attached) I believe I, need 2 meters -ammeter and volt meter ,as I only have a multimeter , am I reading it correctly?
Battery is a multi batt and my be 3-4 years old . Any ideas where to go next! Or is it just the battery!

billdn:
Oops forgot the P.S. when lights are on the voltage fluctuates and the lights dim briefly then the voltage drops then returns to higher level but does it several times. Just to add more confusion to the mix! ???

Bryanj:
Sounds like its charging but battery not accepting it. Modern batteries do not like going flat. Try charging it over a few days and see if it improves also use kickstart for testing not electric

taysidedragon:
A multi meter is a voltmeter and an ammeter, just switch scales.

billdn:
Cheers both, but Gareth the article reads like I need to connect one to read amps and then switch connections to do volts but at different positions , or am I just brain addled with electrics after todays session!

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