2007 Boulevard C90T - Battery seems to not be charging. After a few hours of riding, the battery starts to lose power. I have tested with a volt meter and I get about 13.8 volts when idling, so it looks like it should be charging. But I have killed two batteries in the last few weeks. HELP!

Sounds like a battery issue. The c90 did not come with a radio so I'm sure its aftermarket which the bike was not designed to handle... trickle charging only charges a weak battery... take a load test and make sure you have atleast 10 vdc when the bike is cranking.. easy test jumper cables to a known good 12 volt battery and that the jumping vehicle NOT RUNNING! If it starts with no issue you have a faulty battery

Battery is dead or no capacity. Check charge. A battery can read correct voltage but have no capacity. battery should be 13.8 volts fully charged approximately.

Did this just happen after storage or was it working fine then had the problem>? Needs more details and history to diagnose. How old is the battery??.

Sounds like you need to check the generator and charging circuit.

The bike will start and run on the battery alone until it is drained.

Once a bike has been started the battery power is taken over by the generators power this also replenishes the power lost in the battery when the bike is initially started. If the generator does not generate power the bike will continue to us the power from the battery until it is exhausted and will therefore stop.
A simple test is to turn the bike ignition on and turn the headlamp on (check the brightness of the lamp) Start the bike and re check the brightness of the head lamp, it should be a little brighter if the generator is working. Another test is carried out with the use of a voltage tester (multi meter). Set on dc volts test the batteries voltage eg 12vdc, start the bike and re test the voltage should be around 13 - 14v dc if the charging circuit is working

Classic failure that I have experienced twice now while riding a 2007 Suzuki C90. Both times the bike went totally dead electrically while going down the road. In both cases, I sent a fellow rider off with my battery, to buy a battery that fit. That's how I got home, with the ignition system running off of the battery alone. The old battery was the first bad actor. It shorted out internally causing the regulator rectifier to call for max amps from the stator, burning the stator up...melting windings...both times. Replace the battery with a high quality battery, and replace the stator and rectifier/regulator with top end stuff...like Ricks Motorsports. Yes it costs three times as much, but it handles three times the wattage. Don't go back with OEM parts like I did the first time. It will fail again just after the warranty expires.

probably needs a stator and regulator rectifier. check battery connections first

the altanator is under the left side cover that bulges out, to test the out put with a meter find the plug with the 3 yellow wires that comes from that cover and test with meter set on ac volts 0 to 100 range. put the leads between the wires with them unplugged from harness, test all combantions and you should get about 60 ac volts when you rev motor to 3500 rpm. if this checks good you need the rectifier/regulator not the stator.

Check your battery first, if it's more than 2 years old, it could be had it. Disconnect the battery, and check the voltage with a multimeter, if the reading from your battery alone, is less than 12V, then your battery is no good.
To check your alternator function, using your existing battery, start the bike up, and check the voltage reading at idle, should be about 13 - 14Volts if your alternator is charging the battery.

Charge your battery with a small charger. Get trhe motorcycle going again. With a volt meter, measure what is happening at idle and again at about 1600 RPM (guess if you don't have a tach) You should be getting about 15 volts at higher rpm and at least 11 at idle.

If it is not charging, you will need to test your rectifier. Before we get into that procedure, try the above. If that doent pan out like I say, post a comment to this question and I will tell you how to test your rectifier. Deal?

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Chk the charging voltage at the battery posts. Should be between 13.6 to 14.2 The lower the voltage the hugher the amps. if at 13,6 it is charging heavy. It may not be your charging system. If it shows 12 volts it is charging max output, and at 15 it isn't doing anything.. I would put my money on the battery being no good..