Charging issues I have a 81 suzuki 450, I changed the stator and tested it and it is good, now when I put a meter up to the battery it shows its draining while running than when I rev it up the voltage slowly goes up but it doesnt reach 13 volts like it should... could it be the regulator?

Alternator brushes bad or chargn wire from alt. Battery or connects cud hav issue. Must read 12.6 always. Buy a repairbook

Check you stator output. Find where the wires come out of the stator and unplug them. In the plug you should find either 3 white wires or 3 yellow wires. Test for short to the bike by attaching your blaCk meter lead to the bike frame which should be cleaned for good ground or clip it to the negative post of your battery. Then touch your red lead to all 3 wires one at a time. Any reading at all dictates a short and the stator needs to be replaced. Then check the 3 wires with the neg and pos leads you should get a small resistance reading that'll be normal. If it checks out then your next culprits would in all likely hood be your regulator. Hook up your meter to your battery red on red black on black. Fire up the bike and rev it up to see battery voltage. Anything over 14.3 usually indicates you do have a charging problem. Try another regulator if all else checks out like I explained to you. Remember no resistance allowed on any of the white or yellow wires when meter lead is grounded to the bike.

Start by making sure you have a fully charged battery. This sounds like. Stator issue. Check all terminals as well.
If you’ve found this helpful, please click the green “helpful” icon. If you have 20 seconds please leave a few words as a review or recommendation! Also, follow me for more answers to everyday issues, I’m all for saving you money and making the most of your time! Thanks and have a great day!

You need to buy a volt meter and set it on 10, or 20 v-. Start the bike and see what it says. A good charging system will show 13-14+ volts. If the meter says 11-12 volts or does not change, you have a bad stator, or rect/reg. Take to a shop to have it further tested. Chaz Moto DC