Question about Suzuki Terra 125 Motorcycles

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New battery new regulator,battery runs down in 20 miles

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Check for ac current going into the regulator,from the stator, a four cylnder bike could have 50vAC
No AC then it might need a stator

Posted on Jul 01, 2011


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Why wont the battery charge while the bike is running?

not really enough info to diag this problem but a good educated couple of guesses would be the regulator went bad or the magneto went bad or? the battery is loose and or disconnected the screws routinely rattle out of the threads if that turns out to be the case just put thread lock a glue type stuff around the threads then tighten let sit overnight to cure...but my true guess is either magneto (big job) or regulator not such a big job except where to find it on your bike give more info so I can help nail it down please

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I changed my stator out on a 2003 fxdx dyna glide and it still wont keep my battery charged , i also put a new regulator and battery on it . help

Well, that's all there is to the charging system, a stator, a rotor, a regulator, and a battery.

Charge your battery until it fully charged. Take a digital volt ohm meter and connect the red lead to the positive and the black lead to the negative lead of the battery. Put the meter in DC volts, 20 or higher range. Start the engine and bring it to a high idle. You should read 14.5 to 14.8 volts on the meter. If so, your charging is working as it should. If not, proceed to the next step.

With the engine off, find the plug where the regulator plugs into the engine case. Unplug the connector and look into the part that is inside the case. Using your DVOM, put one lead into each plug or pin in the connector. Be careful not to touch the sides of the case and it makes no difference which lead goes to which pin as the voltage is Alternating Current instead of Direct current. Put your meter in AC voltage, 50 volt or higher range. Start the engine and bring it to a high idle. You should read 30 volts or higher. If not, something is wrong with the stator. As long as you have 30 volts or better, your alternator is working as it should

Your regulator must have a good ground. I always put a 'star washer" on the regulator mounting bolts between the regulator and the frame.

If you used a new rotor, I have run across one rotor during my time that the magnets were not strong enough. You could hold a screwdriver up to it and tell right off that it wasn't right. Only seen it that one time though.

Good Luck

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