SOHC.co.uk Forums > CB350/400

Is there an easy way to test for charging ?

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Johnwebley:
Are all the bulbs LED?

Yes, it will make it tricky

Set your meter to DC,and 0-20v

Sent from my SM-A750FN using Tapatalk

smoothoperator:
As ever Ted I am following your lead. I've done 90 miles now and only just started to think about charging. I have a new Motobatt so it would probably cover that mileage without a charge. When fully charged it measures over 13 volts, can't remember the exact figure. Checked today and it is at 12.4 volts so I will need to keep an eye on it and do the voltage test when running tomorrow. I'm guessing you have a new battery too.

Bryanj:
Set dc volts 0-20 range, if meter goes up when engine running chances are all ok. Regulators can fail but are pretty bomproof normaly, rectifiers hate bad connections and reversed battery.
1 Check volts turned off with kill switch off
2 Check volts turned on with kill switch of
3 Check volts turned on with kill switch on

Should drop a bit for condition 2 and more for 3
When running should increase till about 3,000 rpm but not go over 14.5 ish, 15.5 ok on lead agid or agm but not lithium battery

McCabe-Thiele (Ted):

--- Quote from: smoothoperator on April 19, 2022, 07:47:13 PM ---As ever Ted I am following your lead. I've done 90 miles now and only just started to think about charging. I have a new Motobatt so it would probably cover that mileage without a charge. When fully charged it measures over 13 volts, can't remember the exact figure. Checked today and it is at 12.4 volts so I will need to keep an eye on it and do the voltage test when running tomorrow. I'm guessing you have a new battery too.

--- End quote ---

The bike came with a new dry charged battery I think it's called I just added the battery acid that came in the box - left on slow charge, it seems to crank the engine over no problem with nice bright lights. I have no idea how long the PO had the battery for before I bought the bike. At present I have left the battery on charge  with my C-Tek unit so will do some checks in the morning. If it's not raining I will have a short ride round the housing estate at the back of us. I've been swatting up in my Cycleserve Honda CB400F Servicing Manual P75-81 reads like a comprehensive guide to the charging System & its components.

I'm confident that with the help of members here I will sort it if its not working as it should. Like checking the valve timing I might not grasp what I am told immediately (Thanks again Bryanj for your help)  but I am not afraid to sound dim during the learning process.

McCabe-Thiele (Ted):
So definitely not charging.
Battery voltage with ignition off is 12.94 volts (taken off charge at 1.00 am this morning).
Ignition On Run switch Off 12.46 volts.
Iginition On Run switch On 12.08 volts.

When engine is running voltage is 12.23 volts it does not alter if engine revs go to 5k no change at all - not a flicker of increase.
So system is not charging at all.

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