2020 Ram 3500 wiring

STARTING AND OPERATING335
The Trailer Tow Package may include a four- and
seven-pin wiring harness. Use a factory
approved trailer harness and connector.
NOTE:
Do not cut or splice wiring into the vehicle’s
wiring harness.
The electrical connections are all complete to
the vehicle but you must mate the harness to a
trailer connector. Refer to the following
illustrations.
NOTE:
Disconnect trailer wiring connector from the
vehicle before launching a boat (or any other
device plugged into vehicle’s electrical
connect) into water.
Be sure to reconnect once clear from water
area.
Four-Pin Connector
Seven-Pin Connector

1 — Female Pins
2 — Male Pin
3 — Ground
4 — Park
5 — Left Stop/Turn
6 — Right Stop/Turn1 — Battery
2 — Backup Lamps
3 — Right Stop/Turn
4 — Electric Brakes
5 — Ground
6 — Left Stop/Turn
7 — Running Lamps
5

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IN CASE OF EMERGENCY353
REPLACING EXTERIOR BULBS
Base Quad: Low Beam Headlamp, High
Beam Headlamp, Front Park And Turn — If
Equipped
Low Beam

1. Open the hood.

2. Disconnect and isolate the negative battery
cable.
3. Reach into the front wheel house ahead of the front wheel, remove the fastener, and
lift the cover over the access hole in the
front of the wheel house splash shield.
Access to the rear of the lamp can be gained
through this access hole.

Splash Shield Access Cover
4. Reach through the access hole of the wheel
house splash shield and disengage the bulb
access cover by rotating counterclockwise.

Bulb Access Cover

5. Disconnect the internal lamp wiring harness connector from the low beam bulb. 6. Rotate the bulb counterclockwise a quarter
turn to unlock the bulb from the lamp.
7. Pull the bulb straight out from the housing.
8. Reverse the procedure for installation of new bulb and covers.
High Beam

1. Open the hood.

2. Disconnect and isolate the negative battery cable.

Bulb Access Cover

3. Look under the hood and behind the headlamp to find the high beam bulb
access cover.
CAUTION!
Do not contaminate the bulb glass by
touching it with your fingers or by allowing it
to contact other oily surfaces. Shortened
bulb life will result.
Always use the correct bulb size and type
for replacement. An incorrect bulb size or
type may overheat and cause damage to
the lamp, the bulb socket, or the lamp
wiring.
6

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354IN CASE OF EMERGENCY
4. Reach behind the headlamp and disengage
the access cover by rotating counter -
clockwise.
5. Disconnect the internal lamp wiring harness connector from the high beam bulb.
6. Rotate the bulb counterclockwise a quarter turn to unlock the bulb from the lamp.
7. Pull the bulb straight out from the housing.
8. Reverse the procedure for installation of new bulb and covers. Front Park And Turn

1. Open the hood.

2. Disconnect and isolate the negative battery
cable.
3. Look under the hood and behind the headlamp to find the park and turn socket.

Park And Turn Socket

4. Reach behind the headlamp and unlock the park and turn socket from the lamp by
rotating counterclockwise a quarter turn.
5. Pull the bulb straight out from the housing.
6. Separate the bulb from the socket without twisting. 7. Reverse the procedure for installation of
new bulb and covers.
Side Marker Lamp

1. Open the hood.

2. Disconnect and isolate the negative battery cable.
3. Reach into the front wheel house ahead of the front wheel, remove the fastener, and
lift the cover over the access hole in the
front of the wheel house splash shield.
Access to the rear of the lamp can be gained
through this access hole.

Splash Shield Access Cover

CAUTION!
Do not contaminate the bulb glass by
touching it with your fingers or by allowing it
to contact other oily surfaces. Shortened
bulb life will result.
Always use the correct bulb size and type
for replacement. An incorrect bulb size or
type may overheat and cause damage to
the lamp, the bulb socket, or the lamp
wiring.

20_DJD2_OM_EN_USC_t.book Page 354

IN CASE OF EMERGENCY355
4. Reach through the access hole of the wheel
house splash shield and disengage the side
marker socket by rotating counterclockwise
a quarter turn.

Side Marker Socket

5. Pull the socket and bulb straight out from the housing.
6. Separate the bulb from the socket without twisting.
7. Reverse the procedure for installation of new bulb and covers.
Fog Lamps — If Equipped
Please see an authorized dealer for service on
LED and Halogen front fog lamps. Halogen

1. Reach under and behind the front bumper
to access the back of the front fog lamp
housing.

2. Disconnect the fog lamp wiring harness connector from the fog lamp bulb.
3. Rotate the bulb counterclockwise a quarter turn to unlock the bulb from the housing.

Fog Lamp Bulb

4. Pull the bulb straight out from the housing.
Rear Tail/Stop, Turn Signal And Backup
Lamps

1. Remove the two screws and push pins that pass through the bed sheet metal.

Tail Lamp Locations

CAUTION!
Do not contaminate the bulb glass by
touching it with your fingers or by allowing it
to contact other oily surfaces. Shortened bulb
life will result.
1 — Tail Lamp
2 — Screws
3 — Fasteners
6

20_DJD2_OM_EN_USC_t.book Page 355

356IN CASE OF EMERGENCY
2. Pull the outboard side of the lamp rearward
far enough to unsnap the two receptacles
on the outboard side of the lamp housing
from the two plastic snap post retainers in
the outer box side panel.

Tail Lamp Removed

3. Disconnect the wiring harness connectors from the bulb socket.
4. Rotate the bulb socket counterclockwise a quarter turn to unlock it from the housing.
5. Pull the bulb straight out of the socket. 6. Reverse the procedure to install the bulb
and housing.
Center High Mounted Stop Lamp (CHMSL)
With Cargo Lamp

1. Remove the two screws holding the housing/lens to the body as shown.

CHMSL Mounting Screw Locations

2. Separate the connector holding the housing and wiring harness to the body.
3. Turn the desired bulb socket a quarter turn and remove the socket and bulb from
housing. 4. Pull the desired bulb straight from the
socket.

CHMSL Bulb And Socket

Outside Bulbs: Cargo Lamps
Inside Bulb: Center High Mounted Stop
Lamp
5. Reverse the procedure for installation of bulbs and housing.
CAUTION!
Do not contaminate the bulb glass by
touching it with your fingers or by allowing it
to contact other oily surfaces. Shortened bulb
life will result.
CAUTION!
Do not contaminate the bulb glass by
touching it with your fingers or by allowing it
to contact other oily surfaces. Shortened bulb
life will result.

20_DJD2_OM_EN_USC_t.book Page 356

410SERVICING AND MAINTENANCE
If the “Water In Fuel Indicator Light” comes on
and a single chime is heard while you are
driving, or with the ignition switch in the ON
position, there may be a problem with your
water separator wiring or sensor. See an
authorized dealer for service.

Upon proper draining of the water from both fuel
filters, the “Water In Fuel Indicator Light” will
remain illuminated for approximately 10 seconds.
If the water was drained while the engine was
running, the “Water In Fuel Indicator Light” may
remain on for approximately three minutes.

NOTE:
Care should be taken in disposing of used fluids
from your vehicle. Used fluids, indiscriminately
discarded, can present a problem to the envi -
ronment. Contact an authorized dealer, service
station, or government agency for advice on
recycling programs and for where used fluids
and filters can be properly disposed of in your
area. Drain the fuel/water separator filters when the
“Water In Fuel Indicator Light” is ON. Within
10 minutes of vehicle shutdown, turn the
engine mounted filter drain valve (located on
the side of the filter assembly)
counterclockwise 1/4 turn, and turn the under
body mounted filter drain valve (located on the
bottom of the filter assembly) counterclockwise
wise 1 full turn. Then turn the ignition switch to
the ON position, and allow any accumulated
water to drain. Leave the drain valve open until
all water and contaminants have been
removed. When clean fuel is visible, close the
drain valve following these guidelines:

1. Rotate the drain clockwise to close until
you feel resistance from the internal seal.

2. Continue turning the drain 1/2 of a turn to properly compress the seal.
NOTE:
Over-compression of the seal due to over-tight -
ening of the drain will damage the seal, cause a
leak, and require the entire sensor to be
replaced.
3. Turn the ignition switch to OFF. The sensor drain should not be over-tightened
during normal service operations to avoid
internal damage and future fuel leaks. The
drain should be closed and secured without the
use of tools.
If more than a couple ounces/milliliters of fuel
have been drained, follow the directions for
“Priming If The Engine Has Run Out Of Fuel.”
ENGINE MOUNTED FUEL FILTER
R
EPLACEMENT — DIESEL ENGINE
NOTE:
Using a fuel filter that does not meet the
manufacturer's filtration and water sepa -
rating requirements can severely impact fuel
system life and reliability.
The engine mounted filter housing is
equipped with a No-Filter-No-Run (NFNR)
feature. Engine will not run if:
a. No filter is installed.
b. Inferior/Non-approved filter is used. Use of OEM filter is required to ensure vehicle
will run.

20_DJD2_OM_EN_USC_t.book Page 410

560 Inflation Pressure
...................................... 436Life Of Tires............................................... 439Load Capacity.................................. 433, 434
Pressure Monitoring System (TPMS)... 136, 163
Quality Grading.......................................... 446Radial........................................................ 437Replacement............................................. 439Rotation.................................................... 444Safety.............................................. 429, 435Sizes.......................................................... 430Snow Tires................................................. 440Spare Tires...................................... 441, 442Spinning.................................................... 438Trailer Towing............................................ 331Tread Wear Indicators............................... 438Wheel Nut Torque..................................... 452To Open Hood.................................................. 74Tongue Weight/Trailer Weight....................... 330Tonneau Cover.................................... 100, 448Tonneau Cover Cleaning................................ 448Torque Converter Clutch................................ 245
Towing................................................. 325, 381Disabled Vehicle....................................... 381Guide........................................................ 330Recreational............................................. 339Weight...................................................... 330Towing Behind A Motorhome........................ 339Traction......................................................... 343Traction Control............................................ 153Trailer Sway Control (TSC)............................. 153Trailer Towing............................................... 325Cooling System Tips................................. 336Hitches..................................................... 329Minimum Requirements........................... 330Mirrors......................................................... 46Tips........................................................... 335Trailer And Tongue Weight........................ 330Wiring....................................................... 334Trailer Towing Guide..................................... 330Trailer Weight................................................ 330Transfer Case............................................... 425Electronically Shifted....................... 246, 250Fluid................................................ 463, 466
Transmission................................................. 235Automatic............................... 235, 239, 422Fluid................................................. 463, 466Maintenance............................................ 422Shifting..................................................... 233Transporting Pets.......................................... 209Tread Wear Indicators................................... 438Turn Signals......................... 51, 141, 353, 355
U
UconnectUconnect Settings
.......................... 476, 478,494, 497, 514, 516Uconnect PhoneCall Continuation...................................... 537Uconnect SettingsCustomer Programmable Features... 28, 476, 478, 494, 497, 514, 516Passive Entry Programming............... 28, 476, 494, 514Uconnect Voice Command............................ 541Uniform Tire Quality Grades.......................... 446

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