Directional lights and marker lights and dash and radio all come on with brake lights

All of the marker and tail lights are powered from a 15amp fuse going thru the headlight switch on a brown wire. Do you have power from that circuit coming out of the headlight switch ?

Running lights, marker lights, and dash lights all come from the park light switch of the head light switch. So, possibly you need a new headlight switch. Or, if you have a voltmeter, you can do some testing of circuits to see where power is and where lost. Also check the fuse for tail lights and horn.

Check brake light switch

The only thing that both the brake lights and tail lights use is a ground connection. Keep in mind the warning light on the dash may be for any exterior lamp. You may need to check the sockets and grounds on all four corners of the car.

When you release the brake pedal, there is a switch underneath the brake pedal that disconnects the circuit to your brake lights causing your brake lights to switch off. Sometimes this brake light switch will go bad and need replacement. If your brake light stays on after you turn your car or truck off and you don't want to run your battery down, you may be able to get down underneath the brake pedal and manually pull up on the brake light switch to deactivate it until you can get it repaired.
and i think you can make a diagnostic by yourself and the Autel MaxiDAS DS708 can help you

When you are talking about "indicators" we could assuming that your are refer about signal lights. This work with "flashers" devices.

For 1996 Audi A4 2.8L SFI 6cyl the Flasher is located in front seating area, driver side, under dash, behind dash lower panel, mounted above driver side of steering column.

About generic fuses, open the driver side door. Remove panel on left side of dash. Fuse box is behind panel:

Fuse # / Description / Amps
1 / Heated washer jets / 5
2 / Turn signals flasher unit / 10
3 / Headlight washer, illumination of glove compartment, engine compartment, climate control, automatic transmission, instrument cluster / 5
4 / License plate light / 5
5 / Instrument cluster, seat heating, test connection for cruise control, bulb monitor for auto-check control, Automatic transmission display, switch lighting, mirror switches and actuators, airbag warning light, outside temperature indicator, Climate control / 10
6 / Central locking system / 5
7 / Anti-lock brake system / 10
8 / Vacant
9 / Mirror heating / 10
10 / Vacant
11 / Cruise control (automatic transmission) / 5
12 / On board diagnostic system / 10
13 / Brake lights / 10
14 / Interior lights, reading lights, anti-theft alarm system, vanity mirror / 10
15 / Instrument cluster, power windows, climate control, automatic transmission / 10
16 / Anti-lock brake system, Anti-Slip-Regulation / 5
17 / Heated door locks / 10
18 / High beam right / 10
19 / High beam left / 10
20 / Low beam right / 15
21 / Low beam left / 15
22 / Tail and side marker right / 5
23 / Tail and side marker left / 5
24 / Wiper and washer system / 25
25 / Blower for heating, climate control / 30
26 / Rear window defogger, mirror heating / 30
27 / Rear window wiper / 15
28 / Fuel pump / 15
29 / Engine timing / 20
30 / Sun roof / 20
31 / Tail lights, cruise control, automatic transmission / 15
32 / Engine timing / 20
33 / Cigarette lighter / 15
34 / Engine timing / 15
35 / Trailer receptacle / 30
36 / Fog lights / 15
37 / Radio / 20
38 / Luggage compartment light, central locking system / 15
39 / Emergency flasher / 15
40 / Horn / 25
41 / Anti-lock brake system / 25
42 / Vacant
43 / Vacant
44 / Seat heating / 30

Hope this helps (remember to rate and comme this free answeer).

This usually happens when you have a faulty battery replace it.That sounds like your problem .good luck

make sure all of your brake light bulb are double element bulb
there is a single element bulb u used insted of a double
google whatbulb.com

you need to check to see if it is connected inside the truck there is a plug below the dash near the parking brake

You have a bad ground somwhere. You need to check and look for broken wires or corroded connections. A good manual with a wiring diagram helps with this.