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Re: brake lights don't work
Good ground ? you might need someone to step on the brakes while you check the wires to the back with a test light. if it has no power it could be the brake light switch located near the brake pedal up under the dash .. holler if you need more Jerry .
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have you checked the fuses for the brake lights it is in the fuse panel under the dash on the driver`s side.if it is good and only the brake lights don`t work(signals work)then the nest step is to check the brake switch.this is under the dash at the base of the brake pedal and above.when you push on the brake pedal it pushes against or moves the switch enough to close the circuit.you should see a 2 wire plug connected to the switch.there should be power on one side of the switch at all times and when you push on the pedal there should be power on both wires.one wire supplies power to the switch and the other supplies power to the brake lights.if you don`t have power on both wires then you have a bad switch.NOTE fords have a problem with the wires breaking at the switch.
Chances are the brake switch has failed. The switch is located at the brake pedal in the front or behind the pedal arm. You will have to be on your back looking in order to see it. There will be a two wire switch. When the brake pedal is depressed the contacts on the switch open (or close depending on how the switch is placed) that in turn illuminates the brake lights. Easy to check with a 12 volt test light. One of the wires at the connector will be the power wire, with the test light grounded, probe one of the wires - the power wire should light the test light up. If neither wire light the test light then you have an open on the power circuit. You will need a wiring diagram to find out which wire is the power wire and trace it back until you find the open. If the switch is getting power and the brake lights are not illuminating,, the switch is bad and will have to be replaced. A fairly inexpensive part and fairly easy to replace. If you have little or no mechanical experience you may need to get a technician to replace it. The replacement switch may come with instructions on how to replace it. Hope this helps.
To Track down the problem you need to disconnect the Battery and use a Multimeter set to OHMS.
You are grounding somewhere. Start with the Brake switch and see if it is grounded. Then take off the wires to the switch. Check the wires going to the switch and coming from the switch. One side has to be the problem. Check with a parts place like Autozone or Oreillys for a Brake relay in the power box. If the power wire is grounded unplug the Brake relay and see if it drops the connection.
If it is a wire problem, keep tracing the grounded wire until you find a connection you can unplug to make the Ohmmeter drop. Remember the overhead Brake light on the roof. You may have just worked on the Taillights. The bad wire may be grounding in the roof or on the frame.
Once you isolate the bad wire you may want to run a new one.
Check the brake light switch located under the dash, connected at the junction where the master cylinder rod connects to the brake pedal. Remove the connector and with a short piece of wire, paper clip works fine, insert into the two terminals on the connector. Check to see if your brake lights are on. If they are, your switch is bad.
if there is only power on one side of the fuse it is blown insert another fuse anyways then goto the brake light switch and see if you have power on one side if you do, then press on the brake pedal if power doesn't show on the other side when you press it then you have a bad brake light switch.