Battery not charging

Hello I have a 2000 wr 400 with Baja designs street legal kit. I have a new battery and it won t stay charged. It runs down in about 15 to 20 minutes. Can anyone help. Thanks

Did you put a meter on the battery after you fully charged it and let it sit for 30 minutes? What voltage did you get at idle? At 3,000 rpm?

Did you inspect the connections betweeen the stator regulator and harness?

yes fully charged battery, let it sit. Checked connections they are ok. I will check voltage tonight, thank you.

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