Please help me repair/fix a Native Z6 Lithium battery charger that won't charge unless the relay is bypassed.
This battery charger has been working fine. The Native Z6 electric scooter wasn't used for 3 weeks but was fully charged (until the charger stopped) three weeks ago.
When the XLR and the "sensor" (? not sure what it does) cord is plugged into the charger, the 1st LED lights up. When the charger is plugged into 110AC and is switched on, the charger doesn't power up.
We have over 10 years experience with dozens of electric bikes and scooters and fixed numerous battery charger problems.
However, the Native Z6 Lithium didn't come with any user guides or specifications, even.
Using our instruments, we determined that the piggybacked relay (from EMS, the manufacturer) doesn't switch on.
So, for now, we shorted the AC output at the relay, so at least we can use the battery charger as a "dumb" battery charger. (We are careful to not overcharge, of course.)
FYI, we were told that the "sensor" wire was for a temperature sensor at the battery or the BMS.
FYI, there is no voltage coming from the "sensor" socket at the scooter. The relay is labelled as a 4-32 volt relay on the "input" side.
We have determined using multimeters and AC/DC current sensors (we have such instruments) that all the fuses, cables, on the charger side are functional. i.e. nothing is loose or oxidized.
Any idea how to fix this?
We haven't opened the BMS cover to see if the red LED is still blinking.
Thanks in advance.