ចុះចេញពីតំណែងដោយដៃខ្សែ

Usually there are two option to get our step down cable powered, common or ACC , depends on the purpose of your device.

Fusebox or read lamp is most used to get power .

Videos below on Youtube for your reference.

Dash Cam Install – Hardwired Into Interior Fuse Panel

How To Hardwire A Car Dash Camera with Parking Mode