After drilling holes in the car body, the sharp edges of the holes must be blunted, primed and painted over. Chips formed during drilling must be removed.
During work connected in some way with the electrical equipment of the car to eliminate the risk of a short circuit, the mass wire of the battery (-) disable.
When installing additional electrical consumers, it is necessary to check whether the power of the existing generator is sufficient. If not, then you need to install a new generator of greater power.