Battery not recharging

[Jeansy001]

I just broke down and got picked up by the AA god bless them and he recharged my battery and i got the mile home i needed to but im still stuck as i have a battery thats not recharging. I had literally just rewired it gave it a new CDI Regulator starter solenoid and battery with a whole new loom!!

any ideas why its not recharging?? its a CBR 400
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CBR 400RR,cant get much more fun than that on the road

[Wilson123]

Maybe an internal fault, just buy a new one.
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[Jeansy001]

buying a new one isnt the solution, its brand new done only 10 miles. it will hold charge but if theres no charge coming back from the circuit then its not going to recharge. The problem is an electrical component what i need to know if its the alternator ?? magneto?? regulator or what that i need to replace
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CBR 400RR,cant get much more fun than that on the road

[Timmeh]

Another Honda 400 with charging issues. Seems to be coming a regular occurance.

Before you rip everything to bits, you can do some standard checks that just require the use of a multimeter.

1. measure the voltage across the battery with it off - it should be about 12.5-13v.

2. With the bike at idle (choke off), it should be about 13.5v

3. 3000-7000rpm it should go up to about 14.5-15v.

If you don't get these values...

Grab a haynes as they have all the values you need to find.

Check the resistance of the stator coil by sticking your multimeter pins in the connector block of the reg/rec. Check that they are within the range stated by haynes. You should also turn the engine over once or twice and check the value changes as the stator moves.

Next, test the reg/rec across its diodes using the little table and that you haven't got continuity where you shouldn't have using the bleep test.

If all that's ok, then in theory the charging circuit is working, now you just need to check you've got continuity from the battery to the reg/rec's output.

HTH
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[Jeansy001]

Yep on the 400's are useless. ok i'll try that and see whay is failing me
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CBR 400RR,cant get much more fun than that on the road

[EUMP]

I had the same issue on another one of my bikes, hopped over the battery and worked first time - not sure what the error ever was, in belief the battery just flopped and that was rather new aswell (around 6months in a brand new bike 6months ago)
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[Kickstart]

Hi

Timmeh has pretty much covered it. Suspect the regulator / rectifier unit is the most likely problem. However check the the headlight bulbs are the correct ones, as some of the imports use bulbs that are difficult to source so people bodge larger ones in, that draw more power than the charging system can easily supply.

All the best

Keith
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