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Carlos - if you are going to use a tune, you are going to have to slow down a bit. The installation is fairly straight forward, but has been known to produce errors just like you mentioned if done incorrectly. If you don't feel confident that it is done correctly, seek a professional installation and make sure the battery ( - ) is disconnected during install.
Also, use the USB cable and the JB4 interface. If you are experiencing an issue, GET THE CODES and send them to Terry @ BMS.
The JB4 is a simple boost controller, but w/o any specs on your current configuration, it is extremely difficult to provide advice here on the forum.
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-madmanhiker jax,fl
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