Subaru Forester: Connecting a trailer / Side mirrors

After hitching a trailer to your vehicle,
check that the standard side mirrors
provide a good rearward field of view
without significant blind spots. If significant
blind spots occur with the vehicle’s standard
side mirrors, use towing mirrors that
conform with Federal, state/province and/
or other applicable regulations.
CAUTION
Direct splicing or other improper
connection of trailer lights may
damage your vehicle’s electrical
system and cause a malfunction of
your vehicle’s lighting system...
Other information:
The alarm system helps to protect your
vehicle and valuables from theft. The horn
sounds and the hazard warning flashers
flash if someone attempts to break into
your vehicle.
For models with “keyless access with
push-button start system”:
The system can be armed or disarmed
with the keyless access function or access
key fob...
CAUTION
Direct splicing or other improper
connection of trailer lights may
damage your vehicle’s electrical
system and cause a malfunction of
your vehicle’s lighting system.
Connection of trailer lights to your vehicle’s
electrical system requires modifications to
the vehicle’s lighting circuit to increase its
capacity and accommodate wiring
changes...