SOHC.co.uk Forums > CB350/400

Ignition - or lack of!

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Oggers:
just a thought - could the battery discharge on turning ignition on be the points somehow shorting across each other?

Bryanj:
With capacitor not connected when the points open they spark and what you may have seen, dont know wasnt there, was a continuous arcing which would burn the contact face.
As to battery voltage dont know would need it in front of me.

Like i said Haynes manuals are useful for lighting fires

Nurse Julie:
When you turn the ignition on,
1, are the idiot dashboard lights nice and bright
2, when you push the start button do the aforementioned lights dim and stay dim
3, after doing 1 and 2 can you hear the battery bubbling
4, report back

Oggers:
Nurse

Battery is well down - around 10.5V. When ignition on, it's down to about 4V - Mine is US spec, so lights come on. I am assuming that is why is goes down so much, but it does seem to draw a great deal

However, one thing I will do is stick the battery on charge and take it from there.

Nurse Julie:
Yes, check the battery out thoroughly. I have had a nightmare the last couple of days chasing a problem with my 400/4 electrics.
Long story shortened, changed switch gear about 2 months ago, put all the wiring back together, fitted battery to check everything was working OK, which it was, took battery back off, bike back into storage.
Gave battery a top up this Tuesday, fitted to bike, idiot lights, indicators all very, very dim, no sign of life when I hit the start button but idiot light went even dimmer and were flickering. I got Trig to test battery, which was all OK. Must be an earth problem, I thought 🤔. Checked and cleaned all earth's, no change. Took every connector in the loom apart to clean and check, still no good. Changed the main earth cable from the battery (as I have had one break down on another bike, which caused similar symptoms) , still no better. Temporarily plugged in different switch gear, no change, a new ignition lock and solenoid, still no change. I even took the starter motor out thinking it may have something to do with that. By this time I'm getting very annoyed to say the least. Trig then suggested fitting a different battery....... Boom, everything works perfectly. But that original battery checked out ok when tested. A bloody nightmare.

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