yes you can but the problem you said is your battery getting discharge. its better to have a volt meter install so you can monitor the charging of the battery or much better if you visit your trusted electricial for diagnosis. coz there are several factors why your battery is discharging...
maybe its probably your rectifier is not working properly or your battery has a deffect. try to install a new rectifier if your battery still discharging its your battery OR your lc4v has a grounded wire.
may nabasa na kong ganyang problem dito sabi ni sir haen maluwag or maduming socket daw ang dahilan nyan linis tapos ikabit ng maayos ang mga wire harnes daw ng cdi,TPS etc.