You will need
- - switch the "masses";
- - wire size 35 mm;
- - crimp connector wire;
- - sealing band with the "chipping" of the mirror.
- - a pistol with a hot-melt adhesive;
- - lead crimp battery terminal.
Remove the negative terminal from the battery. Get rid of old transactions "mass" and cook in the cabin inconspicuous place to switch. Make a hole near the battery, to pull the cable into the vehicle interior. The edges of the hole rust inhibitor to prevent rust on them. Seal the hole with a rubber band to mirror and run through her wires. Fill the hole with hot-melt adhesive and carefully insulate all the wire connections to avoid short circuits. Route the cable to the body to the places you want and make holes for the mounting holes of the switch. Securely mount the switch.
To you continued to work the radio, onboard computer, alarm system, additionally connect the casing with the negative terminal of the battery to bypass the switch "mass", using fine fuse. This voltage is sufficient for operation of the alarm and the radio. When you enable a more powerful voltage or a short in the wire, the fuse will burn.
To provide electricity to the regular alarm sound, Central locking and lights, install an additional relay that will shunt the switch "mass" to the response times of devices. If you do not have sufficient skills to compile a complicated scheme similar to a relay, you should consult an electrician to avoid problems. Also find out whether all the functions will remain with this scheme, because it may not be designed for it.
When you always keep a few spare fuses. As to include the starter and forgetting about the switch, you will burn the fuse.
Lead terminals is well treated with petroleum jelly and to check periodically renewing the lubricant. Due to oxidation of the wires can increase the contact resistance of the current. When attaching wires to use for each connection, two lock washers, for a secure connection.