SOHC.co.uk Forums > CB350/400

battery drain

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adriangsmith:
Hi All,
I have an issue with my 400/4 where the battery will become discharged if left unused for more than 3 days.
Brand new motobatt battery, aftermarket regulator/rectifier fitted.
Good voltage from regulator when running.
Not sure where to start looking!
Any ideas?

hairygit:
If you're not using it as a daily hack, charge the battery, but take it off the bike, and see if it still discharges. Sadly motobatt products are not as good as they used to be, and just because something is new, it can still be duff.

Sent from my POT-LX1 using Tapatalk

adriangsmith:
Thanks Hairy
pretty much used every day apart from a couple of days a week or over the weekend.
Did the same with previous lucas battery.
May splash out on a new loom and fuse box in case a short has developed somewhere.
Connected to optimate charger but never seems to reach full charge on the bike.
Also had issues when riding that despite good voltage out of the regulator after 30 miles of hard riding if it cuts out the battery will not have enough power to turn the electric start.

hairygit:
Is the battery voltage actually running down, or are the starter brushes worn/sticking? Are all earth's clean and tight? If the frame is powder coated, was it scraped away where the heavy earth lead attaches to the frame?

Sent from my POT-LX1 using Tapatalk

K2-K6:
Disconnect the main lead from starter solenoid down to starter motor and assess it like that,  you'll have to kickstart it though.

Edit:- this test is trying to remove the function of the starter solenoid as it could be both causing drain and resistance that won't fully power the starter motor when asked.

If you've got an ammeter you can disconnect the main positive battery lead and put the meter across between the lead and battery terminal which will tell you if it's drawing current when all is switched off. That's a seperate test from above.

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