OK, what colour is the wire? I think it is a red wire that requires the 5 volts...here is a description from the factory rep about this signal. (just so you know, the charger was made to charge Li battery with a BMS, if no BMS is used, you must "enable" the charger with a signal of 5 - 12 volts.)
The way making Lithium Charger for no connecting BMS is:We set the fixed maximum voltage before delivery. When the charger is powered on, it begins
charging if there is external control single. When the charger is working, it employs constant
current in the beginning, and then constant voltage. In the constant voltage, when the current
reduces to a specific value, the charging period ends. If control single cuts off at any time,
the charging will end.
There are two control lines. It needs to connect 5V~12V. The current 10mA is required.
I think the wires are red and yellow.