Lights seem ultra dim

" 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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sound like a poor ground connection to your battery or electrical system

Check Ground wires to your head light harness try grounding the ground wire on lamps if they go bright U have ground problem if you ground it all lights maybe effected by this problem remmemmber only left side so sounds like ground try it

Joe

i had this happen with my dodge ram 1500. the guy i bought it from put 350 dollar moon lit lights in with leds and they looked impressive but the issue was that they didnt go bright and i could only see 40 feet in front of me and i was sure taping led flashlights would have done me more good that those stupid headlights. then i had the idea of if the brights work and the dims dont then that means no electricity is getting to the dims so i decided to bridge the power from the bright headlight to the dims and it made all four work. now they all work, and only on bright. so im figuring there is a issue with the wiring in the truck. so this is a temporary solution if you really need just plain old lights like i did because i live out in the country

That is normal. They go bright because during the daytime the outside light is also bright so the lights compensate for the outside brightness by making your dash lights also bright. When you turn your headlights on it assumes it is nighttime and you don't need to have the brightness to see the dash lights so it compensates for this. If you want them to be dimmer, near the light switch there is a roller button to turn your interior lights on just roll that some and it will either make the dash lights brighter or dimmer.

check dimmer switch, go online and type in type of veh, year, model and fuses, keep looking its there

Grab a $5 12volt test light & probe back of switch where wiring comes into switch, for wire that has power when you pull lights on. If that's when you want it illuminated. If you want it too go bright or dim with dash , poke wires until you find that one, while turning switch to bright dim, and test light will do same.

Sounds like your switch is bad (i.e. turn signal / healight dimmer / winshield lever switch) inside the steering column. Replace as necessary.

Check at the headlight sockets for a bad ground.

I believe that all of the Functions Listed above are on the Same Handle. There is a Half Moon Circuit and Switch that Goes around the Steering Shaft inside the Steering Column for this Handle. This is Malfunctioning and will need to be Replaced. Not an Easy Job. You will need to Pull the Sterring Wheel and go from their. Please Rate My Response! Thanks!