Tesla MODEL 3 2020 Owner's Manual page 105

Electrical Connections
Regulations require all trailers to be equipped
with tail lights, brake lights, side marker lights,
and turn signals. To provide power for trailer
lighting, a built-in 7-pin wiring connector is
provided near the hitch support's wiring plugs
for most types of trailers.
1. Left Turn Signal
2. Rear Fog
3. Ground for pins 1-8
4. Right Turn Signal
5. Right Tail Signal
6. Stop Lamps
7. Left Tail Lamp
8. Reverse Lamps
NOTE: Pins 9-13 are not supported at this
time because Model 3 is not currently
equipped with brake controllers.
NOTE: All pins have 12V power.
NOTE: It is the driver's responsibility to
ensure that all electrical connections are
working and all trailer lights are operating
before and during towing. You must perform
manual checks.
NOTE: Loss of trailer lights when towing may
be the result of a blown fuse. Model 3 does
not provide a warning if the fuse is blown.
Contact Tesla Service.
Driving
Towing and Accessories
NOTE: If a trailer fog light is detected, Model
3 disables its rear fog light (if equipped).
CAUTION: Always ensure that the
trailer electrical cable does not
contact or drag on the ground and
there is enough slack in the cable to
allow for turns.
WARNING: Use only the electrical
connections designed by Tesla. Do not
attempt to directly splice or attempt
to connect a trailer's electrical wiring
using any other method. Doing so can
damage the vehicle's electrical system
and cause malfunctions.
Impact on Range
Towing a trailer increases vehicle weight and
drag. As a result, driving range can decrease
significantly. Although Trip Planner attempts
to adjust estimates based on Trailer Mode,
actual energy consumption may vary. Plan
trip length and charging destinations
accordingly.
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