When headlights are on, turn signals won't work, door locks won't work, window won't go up or down, and only one of the headlights works on low beam. When I turn the headlights off, the turn signal, door locks, and window all work fine. Also, the fan to the air conditioner/heater has mostly stopped working, although occasionally it will kick on and work for 10-20 minutes.

1 - Heated washer nozzles, heated outside mirrors 10A
2 - Turn signal system 10A
3 - Illumination 5A
4 - License plate light 5A
5 - Comfort system 7.5A
6 - Central locking system 5A
7 - Back-up lights 10A
8 - Telephone system 5A
9 - ABS 5A
10 - Engine control, gasoline 10A
11 - Instrument cluster, shift lock 5A
12 - B+ (battery positive voltage) for DLC 7.5A
13 - Brake lights 10A
14 - Interior lights, with central locking 10A
- Interior lights, only 5A
15 - Instrument cluster, automatic transmission 5A
16 - A/C-clutch, electrical water pump 10A
17 - Door lock heater 7.5A
18 - Right headlight, high beam 10A
19 - Left headlight, high beam 10A
20 - Right headlight, low beam 15A
21 - Left headlight, low beam 15A
22 - Sidemarker lights, right 5A
23 - Sidemarker lights, left 5A
24 - Wiper system, washer pump 20A
25 - Fresh air blower, air conditioning 25A
26 - Rear window defogger 25A
27 - Daytime running lights 10A
28 - Fuel pump (FP) 15A
29 - Engine control, gasoline 15A
- Engine control, diesel 10A
30 - Sunroof 20A
31 - Automatic transmission 20A
32 - Engine control, injectors, gasoline 10A
- Engine control, injectors, diesel 15A
33 - Headlight washer system 20A
34 - Engine control 10A
35 - Trailer socket 30A
36 - Fog lights 15A
37 - Radio system 10A
38 - Luggage compartment light, central locking system 15A
39 - Emergency flasher system 15A
40 - Dual horn 20A
41 - Cigarette lighter, 12V power outlets 15A
42 - Radio system 25A
43 - Engine control 10A
44 - Heated seats 15A

Have you had vehicle check for DTC'S diagnostic trouble codes . Check fuse's an relays , find wiring diagrams to see what controls these systems ?
Radio/Battery fuse , fuse G 10 amp located in the right instrument panel fuse box . Do you know where this ?
Fuse Block - Right IP - On the right side of the instrument panel
An there is one on the other end of the instrument panel ,driver side .
Fuse Block - Left IP- On the left side of the instrument panel The fuel an temp . gauges not working is probably the step motors inside instrument cluster . GM had problem with this 03 to 06 .
How to repair GM Instrument Cluster Speedometer Gauge Stepper

Daytime Running Lamps (DRL)
The ambient light sensor is a light sensitive transistor that varies its voltage signal to the body control module (BCM) in response to changes to the outside (ambient) light level. When the BCM receives this signal it will either turn on the daytime running lights (DRL) or the headlights. Any function or condition that turns on the headlights will cancel the daytime running lamps operation. With the headlight switch in the OFF position, the headlights will either be turned ON or OFF, after an approximate 30 second delay depending on whether daylight or low light conditions are sensed. The HTR A/C IGN fuse in the underhood junction block supplies ignition positive voltage to the daytime running lamp (DRL) relay coil circuit. The DRL relay switch contacts are connected to the low beam circuit. When the headlamp switch is placed in the OFF position, the BCM will either turn on or off the daytime running lamps, depending on whether daylight or low light conditions are sensed. The BCM energizes the DRL relay, closing the switch contacts and grounding the low beam circuit. Ground is provided at G101. The DRL illuminate the low beam headlights at a reduced intensity. The DRL will operate when the ignition switch is in the ON position, the gear selector is not in the PARK position and the parking brake is released. When these conditions have been met and the ambient light sensor indicates daytime conditions, the DRL will illuminate.
DRL operation in Manual Transmission equipped vehicles will occur when the ignition switch is in the ON position, and the parking brake is released. - check fuse's an relay first.
Door Lock System Components
The power door lock system consists of the following components:
?€¢
Driver door lock switch

?€¢
Front Passenger door lock switch

?€¢
Body Control Module (BCM)

?€¢
Relays: Driver Door Unlock--if equipped, Door Unlock, and Door Lock

?€¢
Door Lock fuse 15A

a fuse number 24,,,
The following specifications are for the Ford Contour and Mercury Mystique manufactured throughout 1995-2000.
Fuses Rating Color Circuit Engine bay fuse box 1 80 Black Power supply to main fuse box 2 60 Yellow Radiator fan 3 60 Yellow ABS 4 20 Yellow Daytime running lights 5 30 Light green Fog lamp 6 30 Light green Not used 7 30 Light green ABS 8 30 Light green Air pump 9 20 Light bue PCM module 10 20 Light bue Ignition switch 11 3 Violet PCM memory 12 15 Light bue Horn & hazard flasher 13 15 Light bue Oxygen sensor 14 15 Light bue Fuel pump 15 10 Red Right-hand low beam Passenger compartment fuse box 16 10 Red Left-hand low beam 17 10 Red Right-hand high beam 18 10 Red Left-hand high beam 19 7.5 Brown Heated door mirrors 20 10 Black Windshield wipers 21 30 Light green Electric windows 22 7.5 Brown ABS 23 15 Light bue Reverse lights 24 15 Light bue Brake lights 25 20 Yellow Door locks 26 20 Yellow Main light 27 15 Light bue Cigarette lighter 28 30 Light green Power seats 29 30 Light green Heated rear window 30 7.5 Brown Engine management 31 7.5 Brown Instrument pannel lights 32 7.5 Brown Radio 33 7.5 Brown Front and rear sidelights (left) 34 7.5 Brown Interior lighting & clock 35 7.5 Brown Front and rear sidelights (right) 36 30 Light green Air bag 37 30 Light green Heated blower 38 Unused Relays Color Circuit Location Engine bay fuse box R1 Green Daytime running lights (Canada) R2 Black Radiator fan (high speed) R3 Blue AC cut-out R4 Brown AC clutch R5 Dark green Radiator fan (low speed) R6 Yellow Starter R7 Brown Horns R8 Brown Fuel pump R9 White Low beam headlights R10 White High beam headlights R11 Brown PCM power supply Passenger compartment fuse box R12 White Interior and courtesy lights R13 Yellow Heated rear window R14 Yellow Heated blower R15 Green Windshield wiper motor R16 Black Ignition R17 Unused R18 Black One touch window switch Driver's door R19 Blue Cruise control cut-off Central fuse box bracket R20 Unused R21 Unused R22 White Fog lights Interface module bracket R23 Black Turn signals Steering column R24 White Left-hand flasher Door lock module bracket R25 White Right-hand flasher Door lock module bracket R26 Unused Bulbs / Lights Wattage Type Low beam headlamp 55 9006 Halogen High beam headlamp 55 9005 Halogen Parking / Side light 5 2357A Wedge Front turn signal 21 2357A Bayonet Rear turn signal 21 1157 Bayonet Tail light 21 1157 Bayonet Stop light 21 1157 Bayonet High mount stop light 5 2723 Bayonet Fog/Driving light 55 893 Halogen License plate 5 6418 Festoon Reverse light 21 1156 Bayonet Front sidemarker 5 2357A Wedge Glove box Map light 5 64111 Wedge Dome light 10 6411 Feston Step/Courtesy light Trunk/Cargo area Engine compartment 10 89 Wedge Instrument-general Automatic trans indicator

No. Amps Circuits Protected 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38 7.5
15
10
7.5
(15)
(20)
_
10
7.5
7.5
10
10
10
7.5
7.5
10
10
20
15
7.5
20
_
_
(20)
20
20
(20)
15
15
20
(15)
20
20
7.5
7.5
10
7.5
30 Power Window Relay
Fuel Pump
ACG
ABS/VSA
Heated Seats*
Front Fog Lights*
Not used
Rear Wiper
ODS (Occupant Detection System)
Meter
SRS
Right Headlight High Beam
Left Headlight High Beam
Small Light (Interior)
Small Light (Exterior)
Right Headlight Low Beam
Left Headlight Low Beam
Main Headlight High Beam
Small Lights MAIN
TPMS
Headlight Low Beam
Not used
Not used
Moonroof*
Door Lock
Front Left Power Window
HAC Option
Rear Accessory Socket
Accessory
Front Right Power Window
Accessory Power Socket on the Center Table*
Rear Right Power Window
Rear Left power window
ACC Radio
ACC Key lock
HAC
Daytime Running Lights
Front Wiper * If equipped

Try jiggling your turn signal/ high beam switch. I have seen these fail and cause problems. Not a cheap part either.

is located under the dashboard on the driver's side. The fuse label is attached under the steering column. If something electrical in your vehicle stops working, check for a blown fuse first. Below table outlines detail fuse number, its ampere and circuits protected.
No.
Amps
Circuits Protected
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38
7.5 15 10 7.5 (15) (20) _ 10 7.5 7.5 10 10 10 7.5 7.5 10 10 20 15 7.5 20 _ _ (20) 20 20 (20) 15 15 20 (15) 20 20 7.5 7.5 10 7.5 30
Power Window Relay Fuel Pump ACG ABS/VSA Heated Seats* Front Fog Lights* Not used Rear Wiper ODS (Occupant Detection System) Meter SRS Right Headlight High Beam Left Headlight High Beam Small Light (Interior) Small Light (Exterior) Right Headlight Low Beam Left Headlight Low Beam Main Headlight High Beam Small Lights MAIN TPMS Headlight Low Beam Not used Not used Moonroof* Door Lock Front Left Power Window HAC Option Rear Accessory Socket Accessory Front Right Power Window Accessory Power Socket on the Center Table* Rear Right Power Window Rear Left power window ACC Radio ACC Key lock HAC Daytime Running Lights Front Wiper

1-heated washer nozzle, heated outside mirrors 10A 2-turn signal system 3-illumination 4-license plate light 5-comfort system 6-central locking 7-buck-up lights 8-telephone system 9-abs 10-engine control-gasoline 11-instrument cluster, shiftlock 12-B+ for DLC 13-brake lights 14-interior lights w/ central locking 15-instrument cluster,automatic transmission 16-a/c clutch, electrical water pump 17- door lock heater 18-right head light , high beam 19-left headlight ,high beam 20-right headlight ,low beam 21-left headlight low beam 22-sidemarker light, right 23-sidemarker light left 24- wiper system, washer pump 25-fresh air blower, air conditioning 26-rear window defogger 27- daytime running lghts 28-fue pump 29-engine control, gasoline/desel 30-sunroof 31-automatic transmission 32-injectors 33-headlight washer 34- engine control 35-trailer socket 36- foglights 37-radiosystem 38-luggage compartment lights, central locking system 39-emergency flasher 40-dual horn 41-cigaritte lighter 42- radio system 43- engine control 44-heated seats

Below is a listing of which fuse corresponds with which circuit:

1 - 10 Amp - Transmission Controller, Gauges, Autostick
2 - 10 Amp - Right High Beam Headlight
3 - 10 Amp - Left High Beam Headlight
4 - 10 Amp - Radio, CD Player
5 - 10 Amp - Washer Motor
6 - 15 Amp - Power Outlet
7 - 20 Amp - Tail, License, Parking, Illumination Lights, Instrument Cluster
8 - 10 Amp - Airbag
9 - 10 Amp - Turn Signal Lights, Turn Signal/Hazard Indicator
10 - 15 Amp - Right Low Beam
11 - 20 Amp - High Beam Relay, High Beam Indicator, High Beam Switch
12 - 15 Amp - Left Low Beam Headlight
13 - 10 Amp - Fuel Pump Relay, Power Train Control Module
14 - 10 Amp - Cluster, Day/Night Mirror,Sunroof, Overhead Console, Garage Door Opener, Body Control Module
15 - 10 Amp - Daytime Running Light Module (Canada)
16 - 20 Amp - Fog Light Indicator
17 - 10 Amp - ABS Control, Back Up Lights, Daytime Running Lights, A/C Heater Control Cavity Fuse Circuits
18 - 20 Amp - Power Amplifier, Horn
19 - 15 Amp - Overhead Console, Garage Door Opener, Trunk, Overhead, Rear Reading, and Visor Vanity Lights, Trunk Release Solenoid, Power Mirrors, Power Door Locks, Body Control Module, Aspirator Motor
20 - 20 Amp - Brake Lights
21 - 10 Amp - Leak Detection Pump, Low Rad Relay, High Rad Relay, A/C Clutch Relay
22 - 10 Amp - Airbag
23 - 30 Amp - Blower Motor, ATC Power Module
24 - 20 Amp - Power Window Motors
25 - 20 Amp - Power Door Lock Motors, Power Seats

Fuse #8, #18 and #22.

Below is a listing of which fuse corresponds with which circuit:

1 - 10 Amp - Transmission Controller, Gauges, Autostick
2 - 10 Amp - Right High Beam Headlight
3 - 10 Amp - Left High Beam Headlight
4 - 10 Amp - Radio, CD Player
5 - 10 Amp - Washer Motor
6 - 15 Amp - Power Outlet
7 - 20 Amp - Tail, License, Parking, Illumination Lights, Instrument Cluster
8 - 10 Amp - Airbag
9 - 10 Amp - Turn Signal Lights, Turn Signal/Hazard Indicator
10 - 15 Amp - Right Low Beam
11 - 20 Amp - High Beam Relay, High Beam Indicator, High Beam Switch
12 - 15 Amp - Left Low Beam Headlight
13 - 10 Amp - Fuel Pump Relay, Power Train Control Module
14 - 10 Amp - Cluster, Day/Night Mirror,Sunroof, Overhead Console, Garage Door Opener, Body Control Module
15 - 10 Amp - Daytime Running Light Module (Canada)
16 - 20 Amp - Fog Light Indicator
17 - 10 Amp - ABS Control, Back Up Lights, Daytime Running Lights, A/C Heater Control Cavity Fuse Circuits
18 - 20 Amp - Power Amplifier, Horn
19 - 15 Amp - Overhead Console, Garage Door Opener, Trunk, Overhead, Rear Reading, and Visor Vanity Lights, Trunk Release Solenoid, Power Mirrors, Power Door Locks, Body Control Module, Aspirator Motor
20 - 20 Amp - Brake Lights
21 - 10 Amp - Leak Detection Pump, Low Rad Relay, High Rad Relay, A/C Clutch Relay
22 - 10 Amp - Airbag
23 - 30 Amp - Blower Motor, ATC Power Module
24 - 20 Amp - Power Window Motors
25 - 20 Amp - Power Door Lock Motors, Power Seats