2020 Ram 4500 Chassis Cab wiring

304IN CASE OF EMERGENCY
Center High Mounted Stoplamp (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.

CHMSL Connector Location

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.

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SERVICING AND MAINTENANCE355
If water is detected in the water separator while
the engine is running, or while the ignition
switch is in the ON position, the “Water In Fuel
Indicator Light” will illuminate and an audible
chime will be heard five times. At this point you
should stop the engine and drain the water from
both of the filters.
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 autho -
rized 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) counterclock -
wise quarter 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 half 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.”
CAUTION!
Do not drain the fuel/water separator filter
when the engine is running.
Diesel fuel will damage blacktop paving
surfaces. Drain the filter into an appro-
priate container.
CAUTION!
If the “Water In Fuel Indicator Light” remains
on, DO NOT START the engine before you
drain water from the fuel filters to avoid
engine damage.
7

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512
Minimum Requirements
......................279Mirrors..............................................42Tips................................................284Trailer And Tongue Weight....................279Wiring..............................................284Trailer Towing Guide...............................279Trailer Weight.......................................279Transfer Case.......................................371Electronically Shifted...................219, 222Fluid....................................... 409, 412Transmission........................................213Automatic......................... 207, 213, 368Fluid....................................... 409, 412Maintenance.....................................368Shifting............................................205Transporting Pets..................................179Tread Wear Indicators.............................385Turn Signals........................... 47, 117, 301
U
Uconnect Uconnect Settings
....................... 415, 423, 424,438, 440, 458, 459Uconnect PhoneCall Continuation................................480Uconnect SettingsCustomer Programmable Features.. 26, 423, 424, 438, 440, 458, 459
Passive Entry Programming.......... 26, 423, 438, 458Uconnect Voice Command....................... 485Uniform Tire Quality Grades..................... 392Universal Garage Door Opener (HomeLink).... 67Universal Transmitter............................... 67Unleaded Gasoline................................ 399Untwisting Procedure, Seat Belt................ 146USB.................................................... 481
V
Vehicle Identification Number (VIN)............ 397Vehicle Loading............................. 273, 379Vehicle Modifications/Alterations................ 11Vehicle Storage............................... 63, 393Vehicle User GuideIn Vehicle Help.................................... 12Navigation.......................................... 12Operating Instructions........................... 12Searching User Guide........................... 12Viscosity, Engine Oil............................... 348Voice Recognition System (VR)................. 485Voltmeter............................................ 194
W
Warning Lights (Instrument Cluster
Descriptions)
........................................ 112Warnings And Cautions............................. 11Warranty Information............................. 502Washers, Windshield........................ 50, 345
Washing Vehicle................................... 394WaterDriving Through................................. 292Water SeparatorDiesel Fuel....................................... 354Wheel And Wheel Tire Care...................... 389Wheel And Wheel Tire Trim...................... 389Wheel Covers....................................... 318Wind Buffeting........................................ 66Window Fogging...................................... 63Windows............................................... 64Power............................................... 64Rear Sliding....................................... 66Reset Auto-Up..................................... 65Windshield Defroster............................. 181Windshield Washers........................ 50, 345Fluid......................................... 50, 345Windshield Wiper Blades........................ 360Windshield Wipers................................... 50Wipers Blade Replacement..................... 360Wipers, Intermittent................................. 50Wipers, Rain Sensitive.............................. 51Wireless Charging Pad.............................. 81

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