TC reported Battery charge loss. TC feedback there was no car indication. Staff (MSL) checked on allcars feedback no abnormalities. ~~~~~ 609/610 Battery voltage and fuse check ok. Conduct APS no power test ok. When cab occupied found that 3609/3610 battery charge loss and master fault light dimly lit (when cab light was off). Uncouple train check 3609 indicator master fault/battery charge loss dimly lit. Unoccupied cab, check 3610 indicator panel: Battery charge loss cable line #53 voltage at 97-107vdc. Occupied cab, indicator panel battery charger loss cable line #53 voltage drop to 15vdc, still enough voltage to cause indicator to dimly lit. Check line #53 diode forward (0.5vdc) cause (0L) blow. Done by Zulq/Saini/Haslan/Arusddin/Haikel.  03/03/21.

Isolated line 53 and junction box from DT 3610 to 2610. Confirmed #2610 line 53 at APS relay unit with stray voltage, 86vdc. Remove CNR, no stray voltage. Further checked CN12 with RSW elect, serviced and cleaned CN12. Satis, normalised all connections and checked battery charge loss indication at 3610, occupied cab, battery charge loss indication was not lit. Condition checked satis. Done by Jack/koh. 05/03/21.