Mustang diagram new light switch but no tail lights

" dim headlights "? None of your lights should be 'dim'. You have 4 lights.

Side Lights.
Daytime Running Lights (DRL)
Low Beam Headlights.
High Beam Headlights.

Here are the fuses, check fuse 5 and D although they covers more items than lights. Your best bet is to find a good local auto-electrician.

1994-1998 Ford Mustang Fuse Box Diagram

https://knigaproavto.ru > ... > Ford > Mustang

17 Oct 2019 - Fuse Panel Diagram Ford Mustang Mk.4 engine: 3.8L, 4.6L, 4.9L, 5.0L and 5.8L (1994, 1995, 1996, 1997, 1998)

More here

https://www.google.com/search?q=1995+ford+mustang+gt+v8+low+beam+headlight+not+working

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Does the fuse blow before or after you step on the brake? If it blows only after you step on the brake, and voltage from stop lamp switch only goes to rear brakes and not through multifunction switch. If only one connector at the rear for brake lamps, take connector loose, step on the brake, if the fuse still blows, the problem is before the connector. You could Use new wire from brake switch feed, when brake switch is activated, to the rear brakes. Leave pigtail at both ends, splice in new wire, You could let new wire just lay on the ground, for testing, from brake switch to rear brakes. If the brakes work and doesn't blow the fuse, Make the new wire permanent and route the wire properly. Just my opinion. I don't have wiring diagram for your model year.

First check the light switch and brake switch. Under driver side is the rear light harness. Go to advance auto get a HAYES REPAIR MANUAL for mustang for that year I think they are all the same.

Turn signal tail lights and BRAKE LIGHTS NOT WORKING

It can be faulty brake light switch causing the problem or its blown brake light bulb. First check and confirm brake light lamp is working and that's not the case.

For turn signal not working it can be faulty turn signal switch or its issue with wiring:----

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To trouble shoot brake and turn signal related problem, check the help links mentioned below:-----

Click the link:----
1996 Buick Regal Grand Sport Brake light Switch Location? http://schematicsdiagram.blogspot.in/2012/04/1996-buick-regal-gran-sport-brake-light.html

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No brake lights on Buick? http://schematicsdiagram.blogspot.in/2012/04/no-brake-lights-on-buick.html

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Brake lights not working on 1989 BUICK REGAL?

http://schematicsdiagram.blogspot.in/2012/04/brake-lights-not-working-on-1989-buick.html

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How to replace Brake light switch on Chevrolet Tahoe?

http://technoanswers.blogspot.in/2012/02/how-to-replace-brake-light-switch-on.html

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How to replace Parking, turn, and Brake Lights on car?

http://schematicsdiagram.blogspot.com/2011/06/how-to-replace-parking-turn-and-brake.html

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Upper brake lights work, but low brake light not working?

http://schematicsdiagram.blogspot.com/2011/12/upper-brake-lights-workbut-low.html

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1997 Cadillac Catera: How to replace Brake Light Switch?

http://howtobyme.blogspot.in/2012/06/1997-cadillac-catera-how-to-replace.html

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2003 Chevrolet S10 Tail light Fuse http://schematicsdiagram.blogspot.com/2012/11/2003-chevrolet-s10-tail-light-fuse.html

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Chevrolet Parking light and Tail lamp light Wiring diagram http://schematicsdiagram.blogspot.com/2012/11/chevrolet-parking-light-and-tail-lamp.html

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Car Tail Lights Not Working?

http://schematicsdiagram.blogspot.com/2011/12/car-tail-lights-not-working.html

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Turn Signal Not working http://technoanswers.blogspot.com/2012/11/turn-signal-not-working.html

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Right turn signal not working on Pontiac Car?

http://schematicsdiagram.blogspot.com/2011/12/right-turn-signal-not-working-on.html

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Only one side indicator light working on car?

http://schematicsdiagram.blogspot.com/2011/12/only-one-side-indicator-light-working.html

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Turn signals not working on 1987 Jeep Wagoneer? http://schematicsdiagram.blogspot.com/2011/12/turn-signals-not-working-on-1987-jeep.html

1996 Chrysler LHS brake light circuit wiring diagram?

http://technoanswers.blogspot.in/2012/02/1996-chrysler-lhs-brake-light-circuit.html

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How to replace rear Brake lights on 2004 Toyota RAV4? http://schematicsdiagram.blogspot.in/2012/02/how-to-replace-rear-brake-lights-on.html

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One brake light on driver side not working, but other lights work?

http://schematicsdiagram.blogspot.com/2011/12/one-brake-light-on-driver-side-not.html

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2002 Lincoln Town car Fuse Box http://schematicsdiagram.blogspot.com/2012/11/2002-lincoln-town-car-fuse-box.html 2007 KIA Rio: Brake Light Fuse Box Diagram?

http://repairhelpcenter.blogspot.in/2012/06/2007-kia-rio-brake-light-fuse-box.html

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Overhead Brake lights not working on 1999 GMC Sierra 4x4?

http://technoanswers.blogspot.in/2012/03/overhead-brake-lights-not-working-on.html

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2004 Ford Mustang: Brake light Fuse Location?

http://howtobyme.blogspot.in/2012/05/2004-ford-mustang-brake-light-fuse.html

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These will help.

Thanks.

im not sure what your talking about, it sounds like you want the wiring for the cluster, but this doesnt control brake,tail or headlights, the brake lights operate through the brake light switch and go through the signal light switch to power those up. the headlights and tail lights work through the head light switch, what system do you need, or what doesnt work.

This is the only diagram I could find for tail-lamps. The top wires are voltage, the bottom wire is ground. The brown color wire is voltage for tail lamps. The other color wire is turn or stop, depending. The turn and lower brake lites use the same bulb filament, just not at the same time. The lower brake lites are wired through turn signal switch. I don't know if diagram matches what you have? I looked at several, all showed the same thing.

first check rear tail light bulbs, fuse and then have light switch checked

I can give you 94 mustang. Don't have 86 but maybe similar

Pin Number Circuit Circuit Function B1 38 (BK/O) Power Supply to Battery B2 195 (T/W) Tail Lamp Switch Feed I 19 (LB/R) Instrument Panel Lamp Feed IGN — Not Used R 14 (BR) Headlamp Switch to Tail Lamp and Side Marker Lamps H 15 (R/Y) Headlamp Dimmer Switch Feed DN — Not Used D1 54 (LG/Y) Interior Lamp Switch Feed D2 706 (GY) Battery Saver Door Switch Feed

Probably either a bad ground (broken wire, rust) or a bad headlight switch. The brake light circuit goes from the stop switch (Located up above the brake pedal) through the headlight switch, through the light bulbs to ground. The tail light circuit goes through the headlight switch, through the bulbs and to ground. The only things that are in common are the headlight switch (Is this the switch you replaced?) and ground.
Not much, but hope this helps.
Have a super day!
Ron

Most tail light problems are a result of a bad ground......somewhere.