Charger is putting out 13.7 volts but battery does not take a charge

First check the battery voltage using a multi-meter set to DC and volt range if reading is below 12V battery has probably one dead cell get a new one, if between 12v and 13V battery should be OK to charge. Remove battery undo negative lead first then positive. Please do not use a car charger or any other charging device that has an output greater that 1 Amp you will fry the battery. Charge the battery for as long as possible. Recheck volts across the battery if above 13V refit battery connect positive lead first then negative.
Start your engine, when warmed up check the voltage across the battery terminals it should be well above 13 volts. Increase the revs and watch the meter the voltage should increase to about 14.5 volts. This shows the battery is being charged. Please remember batteries on bikes only last a few years and short rides do not put enough charge in your battery. Buying and using a motorcycle Smart charger does help. I use a CTEK XS 0.8 12V Motorbike Battery Smart Charger & Conditioner. You get a small wiring harness that fits to the battery with a rubber connector that connects to the chargers plug. This unit will help to keep the charge in the battery topped up.

yes
but battery charge voltage has to be 14.5-14.8 volts to charge a battery
batteries are known to be 12 volts but in fact at 2.2 volts a cell they are 13.2 volts capacity so 13 volts will not charge a battery

It is possible that the unit needs to see a battery load before it engages the charge circuit. To test this measure the voltage of the battery without the charger. Then attach the charger and measure the voltage again. If the charger is working the voltage should be 13 to 14 volts.

Should use proper 24 volt 2-4 amp off-board charger. A 3 red, 3 green flash code on a VSI/Remote Plus controller indicates high battery voltage.

likely your alternator check for voltage at the battery when running it should be 13 to 15 volts . charge your battery with a charger test for voltage when turned off it should be around 13 volts if the battery is good

Mark Batteries your charger is putting our enuf 13.15 volts for each battery so after charging all night you should be reading about 13 volts on each. If your batts are only 12 volts after all night charge then batteries are weak Hope this helps

Harold Do you mean that they won't fully charge or won't charge at all. If you have the small 12/12 batteries then they do not last as long as the U1 batteries (bigger) If you have the U1 batteries check the voltage of the batteries with a volt meter Fully charged should read over 12 volts and up to 13.5 volts. Also check your charger to make sure that it is charging with a voltmeter you can measure the voltage aith the charger plugged in and you should be reading over 13 volts on each battery. Hope this helps you

How old is the battery? When you get it started put a digital volt meter across the battery terminals and with the throttle about 1/2 open check the voltage. If should be over 13 volts DC if your charging system is working ok. If it is over 13 volts your battery has probably just given up. Lawn mower batteries are only good for 2-3 years. A trickle charger can extend the life if used.

I hope this helps.

Check output of battery when bike is idling.
If still 11 volt, then your charger, which is the magneto is faulty or the wire is broken from it to your battery. If the charge varies when you test when engine dead to engine idling, wire is fine. Should be 13 to 13.5 volt when idling if magneto is ok.

J

do you have a volt meter toi check the charger voltage? if so then read the voltage out of the charger, it should be 1 or 2 volts higher than the listing 12v would be 13 or 14 volts. if it's working you probally do have a bad battery. if the charger is out then you have a bad charger.