What happens next in this paragraph?

How to install a gps navigation system for your automobile 
Note that this unit is compatible only for vehicles come with a 12-volt battery and negative grounding. 
Avoid short circuits in the vehicle electrical system during installation. 
Be sure to disconnect the negative terminal (-) from the battery before the installation.
OPTIONS:
(1). Secure all wiring with cable clamps or electrical tapes. Do not allow any bare wiring to remain exposed..
(2). Generally, these devices operate as above, with or without electricity. Connect a copper wire to the wire terminal of the navigation system..
(3). Check with your vehicle licensing board to determine if the battery can be wired in the vehicle and each has an av battery. Keep the vehicle on a flat surface, preferably on deck..
(4). This section uses an inputs ion (dc) meter. Carbon ion meter reduces resistance slightly by breaking down the charge in the drive-area..
(1).