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Electrical short? i noticed that the wire harness connected to the brake light switch was melted, so i will have to replace the harness for sure the switch still looks like it is in good condition. i noticed the problem after seeing my brake lights were on even after turning the truck off. my head lihts were also not turning on after i noticed the problem, where should i start to fix these issues?

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Youd better have an expert look at your wiring and not those dealership boyz -an oldschool guy you could check it yourself for any corrosin or bad connects that can cause hi resistance

Posted on Jul 30, 2009


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1 Answer

Trouble Code PO504, we need a pin test or a wiring diagram. How do you diagnose and repair that code?

most likely cause is faulty brake light switch at the pedal

if can be adjusted needs to be replaced

Faulty stop lamp switch
Blown stop lamp bulb
Brake switch harness open or shorted
Brake switch circuit poor electrical connection

Read more:

Apr 16, 2017 | Cars & Trucks

1 Answer

Brake light and tail light out on same side. Replaced bulb in brake light but still neither still works.

Look at the wiring harness that runs to your tail light fixture. make sure that the harness connections have not loosened. check harness casing and bulb iixtures for breaks or corrosion... sounds like you have a short going on. with the light switch on, try wiggling the wiring where it goes into the fixture. if the light flickers at all while doing this you have a short going on in the fixture and it may need to be replaced.

Feb 28, 2013 | 1996 Dodge Stratus

1 Answer

When i depress the brake pedal i blow the fuse for the brake light switch and therefore the brake lights go out

That fuse is not just for the brake switch, but for the whole brake light system. So the short that is blowing the fuse may be anywhere in the brake light wiring. Start by examinng the brake pedal switch for damage, heat discoloration, melted plastic- anything that would indicate an electrical short. If you have any doubts about the switch, replace it and see if it fixes the short. Next, you will have to trace the brake wires as best you can, looking for places the wire could snag, or chafe the insulation off the wire and let it contact metal. At some point you may need a voltmeter to check wires and brake light sockets for current, and to check for continuity in the wiring. Finding shorts can be sometimes difficult. You may want to consider having a shop tackle it.

Nov 22, 2012 | Cars & Trucks

1 Answer

Why is my brake light fuse melting when i put a new one in

There will be a short somewhere in the wiring harness, remove and check the brake light bulbs, make sure the holders are ok and not damaged. If they appear ok then the issue will most likely be in the wiring somewhere between the back of the car and the fuse box.

Mar 12, 2012 | 1991 Chevrolet Caprice

1 Answer

I have no low-beams. I replaced headlight switch,fuse and both bulbs. Still nothin. The wiring harness seems a bit burnt...could this be an issue?

Certainly a melted connector is an issue. I'd start with what you know is bad. You also said that the wiring harness seems melted. This could be a fused link. Its like a fuse set to pop at certain amps but its a piece of wire instead of a fuse. They're mainly in place to keep your harness from catching on fire. This would indicate a major short. Possibly from your switch. I'd re-wire the switch with good clean tight connections and consult a service manual about the location and size of fused links, replace accordingly. Also, spend some time inspecting the rest of your wiring to be sure you don't have a short elsewhere before powering back up. Please let me know how things work out or if you have more questions. Thanks and good luck!

Jan 21, 2012 | Dodge Neon Cars & Trucks

1 Answer

No brake light no running lights no dash lights if u play with the headlight switch u can get every thing to work but brake lights but when u press the brake it turns your headlights off

I'll make it brief( something wrong w/ my ISP ).
You got problem in the light switch assembly, the plastic cam is already melted and failed to push the metal contactors to the contact points. Replace is necessary.
The brake and headlight problem, better check the shorted wire in the relay and fuse box in the engine area, there is a shorted wire that stealing the power of the headlight relay, thus it turns off when you step on brakes.

Recommendation: Better have a tech to check on that, a total check up of the lighting and brake light harness is required, the main harness under your steering must be check thoroughly.

Hope that helps!

Nov 24, 2011 | Cars & Trucks

1 Answer

96 dodge intrepid brake lamps do not turn off. already replaced brake lamp switch. lights stay on even after removing fuse. please help

Hmmm... sounds like a power( live line ) melted the insulation and fused together w/ the brake line, thus it powers up your brake light.

Check your rear brake wire harness leading to the front connection main harness., if the harness are covered w/ plastic insulation, cut the insulation and look for a wire that melted and fused together.
If you found the wire, seperate it and put some insulator tape to prevent power line shorting.
The power line usually colored RED.
Hope that helps!

Nov 06, 2011 | 1996 Dodge Intrepid

1 Answer

I have a 91 ford f150 and the brake lights wont work and the rear right blinker is dim. Can you help me?

Check System Fuse - A fuse is used to protect the brake light circuit from amperage overload. If the fuse has failed it will not allow the electrical current to continue to the brake lights. To check the fuse, first locate the brake light system fuse in the fuse panel which is either under the dash or under the hood in the power distribution center. Connect the test light to a ground like an engine or dash bracket and turn the ignition key to the "on" position. Using the test light probe both sides of the fuse. If the test light illuminates on both sides the fuse is okay continue onto the next step. If one side of the fuse illuminates the fuse has failed and needs to be replaced. If the fuse fails as soon as it is replaced or when you apply the brake pedal the brake light electrical circuit is shorted to ground. Rarely a system short can occur, a car repair manual is needed to find the wiring schematic for the brake light circuit. Once the brake light wiring has been located inspect and repair as needed.

Check Brake Light Bulbs - All cars have three brake light bulbs that create the brake light illumination affect. If all of these brake light bulbs fail no brake light operation will occur. I know what you're thinking, you might say all three brake lights at once? But in reality one brake light went out at a time and you did not notice. People only tend to notice something when they almost run into the back of your car to help persuade them to inform you the brake lights aren't working. Remove any of the brake light bulbs to confirm the bulb is okay or burned. After the bulb has been removed inspect the filament and replace if failed. If the brake light bulbs are okay continue to the next step.

Checking the Brake Light Switch - A control switch is used to connect the brake light electrical circuit. This switch is located near the brake pedal lever. Basic switches have just two wires, power in and power out to the turn signal switch. Use a test light that is grounded and with the key in the "on" position test for power at one side (wire) of the switch, then press the brake pedal while testing the opposite side (wire). It should illuminate the test light, if electrical power is connected through the switch go to the next step. If no power is detected through the switch the brake light switch has failed and replacement is required. If your car is equipped with more than two wires integrated into the brake light switch a car repair manual is needed to locate the proper brake light circuit wiring.

Nov 05, 2011 | 1991 Ford F150

1 Answer


The PCM monitors changes in input voltage from the brake switch. If the PCM does not detect PCM terminal 1AU voltage changes while alternately accelerating and decelerating 8 times, the PCM determines that brake switch circuit has malfunctioned.

• Brake switch malfunction
• Poor connection of brake switch connector or PCM connector
• Short to power supply in wiring harness between brake switch terminal D and PCM connector terminal 1AU
Open circuit in wiring harness between brake switch terminal D and PCM connector terminal 1AU
• Open circuit in wiring harness between battery positive terminal and brake switch terminal A
• PCM malfunction

Do you have an immobilizer on this truck? Possible short circuit? Do you have added trailer wiring on this truck? Possible short circuit? Are your brake lights working normally? If not, is the brake light fuze OK?

Jan 04, 2011 | 2004 Dodge Ram 1500

3 Answers

Rear lights wont go on but brake lights work

Fuse box is a good place to start, and check under hood for power distribution box with more fuses.

Jun 01, 2009 | 1991 Ford F150

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