AT&T MMD85 - Manual (Page 4)

4
Installation Guide
VEHICLE PREPARATION:
1) Locate an accessory power source (+12v when key is in the ACC. and run positions, and 0v when
key is off). Also find a location that will provide a good grounding point. Generally, this wire can be
found at the ignition switch or fuse-box.
2) The mounting method and location will vary from vehicle to vehicle, so this manual will only focus on
the installation of the video monitor and related accessories.
3) Generally, the best location for the video monitor is where the vehicle's factory dome light is installed.
The monitor should be located in such a manner that it can be comfortably viewed by rear seat
passengers. NEVER INSTALL THE MONITOR IN A PLACE WITHIN THE DRIVER'S VIEW. THIS IS
NOT ONLY DANGEROUS, BUT IT IS ALSO ILLEGAL.
4) Once the mounting location of the monitor has been determined, there may be additional preparation
work necessary, depending on the vehicle structure and installation method. Some of the steps that
may be required are:
A) Removal of the vehicle's dome light
B) The headliner may need to be trimmed
VIDEO MONITOR INSTALLATION:
In this installation, the video monitor is mounted directly to the overhead cross-member in the
roof using the mounting screw bosses. These screw bosses should contact the cross-member
directly (i.e.: no gap between the screw boss and the roof structure). Also, be sure that the
screws do not pierce the outer roof skin when fully fastened to the cross-member. It is important
that the screws used in this installation are not overtightened, and that the video monitor is mounted
in such a way that the assembly does not distort (or bend) when the mounting screws are tight-
ened. An alternate method is to use a piece of plywood. First secure the plywood block to the
cross-member, then screw the monitor into the plywood. See the drawing on page 5.