Headlights Tail and Brake Lights
Ford Explorer XLS
Ford Escort LX

Why would the brake lights dim and not work at all when the headlights are on?

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2005-10-24 18:09:24
2005-10-24 18:09:24

Your battery is probably almost dead either due to an old battery not retaining a charge or your alternator is dead. both are easy to replace assuming you have basic mechanics skills. Test by using a volt meter to see if you are getting at least 12 volts coming off of the alternator. Touch the end of the bolt that is attached to the wire and then touch something grounded. If the volt meter reads at least 12 volts, then you need to replace the battery. Even if it is the alternator, in my experience, once your alternator goes, the battery is close to follow. They just don't like to be drained to nothing repeatedly. The alternator should cost you around $200. Be sure to save the old one and return it to the auto parts place for a core refund, probably about $50.

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ummm... your brake lights should ALWAYS work whether your headlights are on or not, that's how people behind you know you are stopping.

if you recenly replaced bulbs u may have installed them backwards they should be running lights and brake lights if this is the case they maybe installed incorrectly

Check the bulbs they are double filamented with smaller being for brake lights

The brake lights and the tail lights are separate circuits. Check the brake light fuse, then check the brake light bulbs, then check the brake light switch.

Often this type of behavior is caused by a bad ground for the lighting circuit. Check the ground circuit for the brake lights.

Nonfunctional Brake LightsOne possible cause of this issue is that the brake light switch is not adjusted properly, or the switch could be defective.

If you are referring to the brake lights it is probably a bad brake light switch. Your vehicle may also have daytime running lights which would be on without the parking lights.

Check the bulbs - they are double filamented smaller for brake lights and larger for tailights. Check sockets for power and ground

that sounds like i ground in the bake by the lights or if it has a trailer plug i would start their

Break lights come on when you step on the break, they do not come on when the head lights are turned on.

I would check the rear bulbs. I just had this issue and it ended up my brother had used the wrong bulb, and odd enough it caused the brake lights to stay on with headlights. When headlights were not on and you applied the brakes the dash would light and brake lights worked. Strange, HUH? I must admit before this revelation, I replaced headlight switch and brake switch, with no avail.

Replace the fuses if they go out its a short. Good luck finding that

I have run into the same thing with this kind of car. On the steering column at the top they have a switch that will turn the running lights on or turn them off. check the switch you may have hit it and turn it on.

You probably have a loose wire connection in the brake light sockets. Insert a nail or probe tip into the back of the light socket where the wires are inserted and test the brake lights. (The socket can appear perfectly normal and the wires may even seem well attached.)

If the headlights are on and brake lights work but not the tail lights, it is possible there is a short in the electrical wires. Another cause for this could be that the tail light bulbs are burned out. Most vehicles have more than one bulb inside the tail lights to control different lights at the same time.

check the fuse for the brake lights, they have thier own. also check the brake light switch at the at the top of the brake petal


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