Typically labeled as +5V or OPTO for the signal isolation circuit. Where to Find the Full PDF
Many HB-B3HL units have internal DIP switches to set voltage thresholds. The manual includes a truth table showing each switch’s function (e.g., SW1 = battery type, SW2 = float voltage). hb-b3hl manual pdf
This article does not replace professional electrical advice. If you are unsure about any step, hire a certified technician. Typically labeled as +5V or OPTO for the