SOHC.co.uk Forums > CB350/400
Defective battery or charging problem or other?
Menno:
Start bike,
let it idle.
Pull the minus cable from the battery while the bike is running.
If the bike stalls, it is either your rectifier or your alternator.
If the bike keeps running it is your battery.
Bryanj:
Check cleanliness and tightness of all connectors especially engine to electric plate block.
I have had one regulator where the moving points would occasionaly "stick" in the middle open position and that was on my 500 in 70's
ka-ja:
Check the regulator points and clean up faces with some fine wet and dry.
billdn:
Not ignoring your advice guys, just waiting for replacement multi meter to arrive.!
billdn:
So new multi meter in hand of to the workshop! And the scores on the doors read thus:-
Rectifier - appears ok and is giving same values as a new one I'm using another project 400/4 -check!
Field coil - should be giving between 4.6- 5.0 ohms and is 4.9 ohms and is also showing no continuity between white and green wires as required - check!
Stator coil - should read 0.61-0.69 ohms on yellow wires (according to one manual either Clymer or Haynes, forget which) and is giving between 0.13-0.15 although all yellow wires give same reading more or less when tested between them. From connector block which has 3 yellow wires, 1 white, 1 green,1 red/blue and 1 red/green wire only the red/blue and red/green wires are showing continuity - the question is have I found the fault and would this stop the horn working?
only problem now is trying to remove alternator cover screws - 3 out and 1 will not shift , mindful of not breaking lug off of cover too! Sprayed with penetrating oil and wait and see.
As a footnote bought a simple clamp type ammeter and when starting bike dial registers big surge to start then returns to zero.
Any ideas, anyone?
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