<!-- from fixya rte -->Where is back up lamp fuse box - 2002 Mercury Grand Marquis

that is a UK car so say UK first. as lighting laws are not the same on cars world wide at all
is that OEM opted lamps
or hacked in aftermarket lamps, as seen by wires hacked at lamp back side. (I can see what is there)
lost the owners guide? in glove box.
cars have up to 4 fuse boxes.
2 in cab ,2 in engine bay, look in all: or read the guide first
if is OEM, opted fogs, only the service manual covers that.
in UK

They are the function of the Body Control Module
Body Control Module (BCM), License Lamps, Marker Lamps

Park/Turn/DRL Signal Lamps, Tail/Stop and Turn Signal Lamps

Chevrolet Cobalt (2005-2010) fuses and relays

https://fuse-box.info > chevrolet > chevrolet-cobalt-200...
Fuse box diagram - In this article, we consider the first-generation Chevrolet Cobalt, produced from 2004 to 2010. Here you will find fuse box diagrams of ..

Question corrected for clarity.

The Passenger Compartment (steering wheel) box does 2002 to 2007 according to these. HOWEVER, although the same layout, so do different things depending on the year like this one.

Fuse8 15amp 2003-2004, Diesel: Back-up lamps 20amp 2005-2007: Back-up lamps

Ford F-350 (2002 - 2007) - fuse box diagram - Auto Genius

https://www.autogenius.info > ford-f-350-2002-2007-f...
May 17, 2018 - Ford F-350 (2002 - 2007) - fuse box diagram. Year of production: 2002, 2003, 2004, 2005, 2006, 2007. Passenger Compartment Fuse Box.

Ford F-250 / F-350 / F-450 / F-550 (2000-2003) fuses and ...

https://fuse-box.info > ford > ford-f-250-f-350-f-450-f-...
Fuse box diagram (location and assignment of electrical fuses and relays) for Ford F-series Super Duty (F250 / F350 / F450 / F550) (2000, 2001, 2002, 2003).

More here
https://www.google.com/search?q=2002+ford+f-350+diesel+7.3.+xlt+super+duty+fuse+box+diagram

Looks like fuses 30 and 41

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Buick Rendezvous (2002-2007) fuses and relays

https://fuse-box.info > buick > buick-rendezvous-2002-...
Fuse box diagram - Fuse Box Location. It is located in the passenger's side of the center console near the floor, behind the cover.

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08 mercury mariner ? reverse lamps ?
Reverse lamps relay could be the problem . located in the under hood fuse / relay box. Fuse box diagram here http://www.bbbind.com/free-tsb/ enter vehicle info. year , make , model an engine . Under system click on electrical distribution , then under subsystem click on fuse panel . Click the search button ,then the blue link. The first diagram is the under hood fuse/relay box . Upper right side , along side fuel pump relay . Try replacing the relay .

My thought would be room lamp, 15 amp. Interior fuse box.

TAIL LAMPS, LIC LAMPS
15 AMP
PANEL DIMMING Fuse, Radio, Headlamp Switch, Instrument Cluster, Heater-A/C Control (CJ3), LR and RR Marker Lamp, LH and RH Tail/Stop/Turn Signal Lamp, LR and RR Park Lamps, Rear License Lamps
Instrument panel fuse box ,location
Fuse Block-I/P
Right side of the I/P, in the right front door opening

in what country, car is sold all over the earth, !
The dash tells me NOTHING. (but guess, background Illumination)
there are many things that glow in dashes.
like

1. warning lamps.
2. map lights
3. radio lamps.
4. speedo and tacho, back lighting (part of the PARKing lamps)
5. the dash dimmer knob if turned down kills #4 in cluster.
6. foot well lamps. glove box lamps. shifter lamps. etc. endless.

If you don't have the operators guide or FSM book,
then you cant know what fuse it is, can you,
nor where it is.
you can login to mitchells DIY and read it.

ill pretend you said, USA>
just sold my 04 GV, Hated it. and is YUGO status here now.
my guess is , driving in the dark the cluster is dark.
so, turn the knob to up, if still dark do this.
ours is H25 , 2.5L V6, and has its own wring system. guess, 3

20 questions, are the cars exterior park lamps dead.?
if yes , open hood, open fuse box.
see HL fuses. if blow , bingo.

my guess, 4 is HL dead. left. fuse 6
tell more get more, are park lamps dead, be top top clue1

Very strange. The interior lamps should all be on the same circuit. There is a fuse box near the parking brake pedal and another in the engine compartment. I think the fuse for interior lamps is in the box near the brake pedal. Your owners manual should have details.

IF HAVE AUTOLAMPS
IP FUSE/RELAY PANEL fuse 26 10A & fuse 20 RLY COIL 10A
POWER DISTRIBUTION BOX UNDER HOOD
H/LAMP 15A
.................................................................................................
IF DAYTIME RUNNING
: i/p fuse relay panel fuse 20 RLY COIL 10A
fuse 3 ENGINE CONT 5A

: LH COMPARTMENT FUSE/PANEL
H/LAMP LH 15A
H/LAMP RH 15A
.................................................................................................
WITHOUT DAYTIME RUNNING LAMPS
: LH ENGINE COMPARTMENT FUSE PANEL
H/LAMP LH 15A
H/LAMP RH 15A
: I/P FUSE/RELAY PANEL
#19 TAIL LAMP 15A