Tail Lights/Interior lights not working

Sounds kinda light the headlight switch needs to be replaced, my instrument cluster lights wouldn't come nor my running lights, but when I pressed the brake the brake lights would come on, Put in new switch and everything came on like its suppose to.

The switch cost like $18-24$ at the parts store, you could buy it and see if it works if not return it. Good luck.

Can't help with the remote keyless entry, I don't have that option, but I might be able to shed some light on your other issue.

I recently bought my Mom's '94 GT and discovered that it had the same problem. When the headlight switch was "on", the parking lights & dash lights would not be, even though the headlights themselves would be on when the switch was in the full on position. I figured it had to be a problem with the headlight switch, so I googled "1994 Mustang headlight switch removal" and found a step-by-step guide (w/ pictures!) on how to gain access to the switch. When I pulled it out of it's mounting spot, I found that one of the wires going INTO the wiring connector from the car was damaged and shorting out.

I was able to replace the bad connector on the car wiring with a female "blade" type wiring connector that fitted the male end of the switch connector perfectly. I tested my repair work before putting the switch and dash back together and it worked like new. The headlights, parking lights and dash lights now work like they are supposed to when the headlight switch is in it's various positions.

Keep in mind that the failure was on the car side of the wiring harness and not in the switch itself, so replacing the switch would have done nothing in my case and it might be that you do have a bad headlight switch, but I hope I have given you some idea of where the failure might be.

Found this topic while browsing the forums, it has a link to a website that sells the wiring harness that plugs into the headlight switch: http://forums.stangnet.com/showthread.php?t=744114

You mean like this



My lights worked with the burned up harness for 3 years and I finally replace it last week. I soldered it in.

Looks exactly like my wiring harness. I beginning to wonder how common this problem is and if it's the same wire in the harness that has the shorting out problem. I'll probably replace the harness in the future, but right now I've got a few other things to spend my cash on, like a less restrictive exhaust system.

I realize this post is 11 years dormant, but I'd like to say that the burned headlight connector is apparently pretty common. I have a 95 GT convertible (282k miles) and a 94 GT coupe (135k miles). The 94 is a parts car and hasn't been on the road in over a decade. Both connectors are burned in the same place. Looking at the wire, there is a lot of exposed strands on both. I can see why they short and melt. At least my 95's lasted as long as it did.

And AutoZone sells the connector for about $12.

Happy motoring,
Chuck