The full range of the battery is from just over 14 volts (when being charged by the bike running at high RPMs) down to 10.5 volts (under heavy load, for example, when the lights are on and the bike is being started). It did crank when I first put it together, now, put a new tank and pump on it. When I turned on the ignition, the voltage drops to 12 – 12.1 volts. If a battery reads 12 volts at rest, it is almost fully depleted. This NEEDS to be correctly charged and tested before you start and troubleshooting. The battery’s main role on a motorcycle is to get it started. These leads carry a high current and any bad connection here will result in a lower voltage over the battery-terminals. 3. Its an 08 gsxr 600 with a brand new battery. Now the guages dont come on, voltage is stable around 12.4 until you turn the key on then it drops to 5ish and slowly rises until 6.4 and tops off. I would have the battery load tested before spending money hanging random parts. Motorcycle Battery maintenance tips. You must ride it to produce a load on the electrical system, or at least run the engine at a cruising RPM, for quite some time to produce the 13.5-14.5 volts required to charge the battery back up. Battery: This is a huge part of your charging system. Check the voltage drop at the battery when you hit the starter button, anything below 9 volts you might have a faulty battery. My bike would not crank over. Anything with EFI is going to need a good battery to run properly. If your battery is charging perfectly but your motorcycle still seems to keep killing the battery. Check voltage at the battery with the bike running at 3,600 RPM should be 14.3 to 14.7 volts. By the time voltage drops to 12.7, you are drawing amperage out of the battery, so any increase in amperage output after the voltage drops to 13.8 will be considered unusable. 4. It can even show the proper voltage (12.6 or more) and not be able to crank an engine when a load is applied. - When battery is all hooked up and the ignition is in the OFF position the system voltage reads ~13v (I am measuring this at the battery … It only takes a tiny bit of maintenance once a month or so to keep it running well. If you are not getting these numbers you might have a faulty voltage regulator. When starting the bike, the voltage drops to 8V. Even a brand new battery can fail if it drops below a certain point. Note: On Cycle Electric Inc. low volt models normal operating voltage … With the bike running, the voltage continues to drop to less than 6V. The extra lead carries a much lower current and the result of this setup is that the output-voltage of the regulator-rectifier will be higher, the same DC-voltage as the voltage-drop in the high current leads plus 14.4 Vdc. It measured the same the next day at 12.5 volts. With a little TLC, you can extend the life of your motorcycle battery. Use a battery tender – Ideally, you want to keep your motorcycle battery at 100% all the time. Your battery is in need of charging and the charging system on your bike is NOT working. Unless you have additional electrical ad-ons, that’s basically all the battery does. After sitting for a short time, the battery is back up to 12V. Once turning off … Not sure what my issues is. Once the motorcycle is on, the stator takes over and is what helps the bike run while also recharging the voltage the battery had to use to get the motorcycle started. It was dropped and put back together. To be clear, the battery resting voltage is 12.1V. Maybe on an older bike. At idle, your bike will not produce enough voltage to recharge a battery, so even running the bike for a long time will not charge it reliably. - Battery is fully charged and I have confirmed this with volt meter reading ~13v. 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