Question about Harley Davidson FLSTC Heritage Softail Classic Motorcycles

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Brake lights do not illuminate with eitheir front or rear brake applied. Bulb has been changed.

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Sounds like you're not getting voltage to the rear brake light pressure switch. The voltage goes to this switch and then to the front switch.

First, find your fuse box or circuit breaker that powers the light. Since you didn't tell me what model bike we're working on the best I can tell you is that the fuse box is usually either under the seat or, in the case of a Sportster, behind the triangular plate on the left side of the bike.

Also, check the connection on the pressure switch. Find your rear brakes master cylinder. There should be a metal brake line coming out of the master cylinder. Follow it back until you come to a "Tee" fitting with a pressure switch in it. Check to make sure the wires are on the prongs of the switch securely.

Good Luck
Steve

Posted on Aug 22, 2010

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2 Answers

Why is the brake light on after putting front brakes on


Do you mean the brake lights on the rear of the vehicle or the brake light on the dash?

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One Brake Light Not Working


Inspect Brake Light Bulb: The number one reason for a brake light operation failure is a failed brake light bulb. To check this condition access the bulb by removing the rear cover located in the trunk or rear compartment. Some cars allow you to remove the entire brake light lens to retrieve the brake light bulb. Once the bulb has been removed inspect the bulb filament. If it looks broken or if the bulb is smoked the bulb needs to be replaced. If you have replaced the bulb but it still doesn't work remove the bulb. With the key in the "on" position have someone hold their foot on the brake pedal and use a grounded test light to carful test the terminals inside the light socket. One of the terminals should illuminate the test light. (Note: Do not touch the outer metal ring that holds the bulb in place for it is grounded and can blow the system fuse if connected to the inner terminals.) If the test light illuminates reinstall the brake light bulb. While the brake pedal is depressed test the outer metal ring that holds the bulb, if power is present the ground lead from the light socket is bad. If the outer ring does not illuminate the bulb has failed and replacement is required.

Scan BCM for Trouble Codes: Some cars are equipped with a body control module or BCM this onboard computer controls and lighting signals and can malfunction not allowing the electrical current to continue to the brake light circuits. This condition is rare but it can happen. If you have performed all of the tests above and all results are positive scan the BCM for trouble codes if no codes are present try replacing the BCM.

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1 Answer

Brake lights won't work


-Bulb is good...?
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1 Answer

Tail lights work but not brake lights 93 toyota camry


The brake light side of the bulbs is powered by the brake switch and travels thru the turn signal switch.
If the third brake light works, I would guess the problem is in the turn signal switch.

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1 Answer

2009 Impala rear lights not working


Turn Signal Lamps
The LT T/SIG and RT T/SIG fuses located in the underhood fuse block supplies battery positive voltage to the body control module (BCM) for turn signal and hazard lamp operation. When the turn signal switch is place in either the LEFT or RIGHT position, ground from G202 is applied through the turn signal switch signal circuit to the BCM indicating the turn signal request. In response to this signal, the BCM applies a pulsating voltage to the front and rear turn signal lamps supply voltage circuits cycling the lamps ON and OFF. The BCM also sends a message via GMLAN to the instrument panel cluster (IPC) to cycle the turn signal indicator ON and OFF depending on the position of the turn signal switch.
Ground for the turn signal lamps is supplied as follows:
• G101 provides ground for the left front turn signal lamp
• G100 provides ground for the right front turn signal lamp
• G302 provides ground for the left and right rear turn signal lamps

The LT T/SIG and RT T/SIG fuses located in the underhood fuse block are also used by the body control module (BCM) for stop lamp operation.
The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The body control module (BCM) provides both, a 5-volt reference voltage and low reference to the brake pedal position sensor. The position sensor provides an analog voltage signal back to the BCM that will increase as the brake pedal is applied. When the brake pedal is applied, the BCM will then apply battery voltage to the left and right stop lamp supply voltage circuits and the center high mounted stop lamp (CHMSL) supply voltage circuit illuminating the stop lamps. At the same time the BCM signals the transmission control module (TCM) and the engine control module (ECM) that the brakes are applied. Ground for all stop lamps is provided at G302.
The stop lamps on this vehicle will not illuminate unless the ignition is in the accessory, run, or crank positions. When the ignition is in the OFF position the stop lamps will not illuminate when the brake pedal is applied.

Did you check the fuse's. ? Wouldn't think it's a ground because right an left tail lamp Assembly's use same ground ! Did you check for B+ voltage at the bulb. with a volt meter ? Power is supplied by the BCM . Could be the tail lamp assembly

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1 Answer

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There is no "brake relay" on a Harley motorcycle. If you're talking about a brake light switch that illuminates the brake light when you apply the brakes, there are two of them. One is located in the front handlebar switch housing (throttle grip housing) for the front brake. The other is located underneath the transmission usually. Find the metal brake line coming out of the rear brake master cylinder and follow it back towards the rear brake. You will find a "tee" fitting with a pressure switch in it with several wires connected to it. This is the rear brake light switch. I hope this helps,

Good Luck
Steve

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1 Answer

1995 ford windstar gl and only the top mount brake lamp is illuminating. Checked all fuses and bulbs and they are all ok. the rear lower 2 lamps illuminate when the lights are on, they just don't brighten...


Sounds like maybe a bad turn signal switch. If the brake and turn signal use the same bulb than the turn signal switch will interrupt the brake signal and supply a turn signal to the bulb. Usually you can wiggle the switch while holding the brake pedal down and get them to intermittently work. If that happens than for sure the switch has failed.

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2 Answers

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the swich is just at the corner of brake leaver, notice that there will be a wire coming from the leaver....... that is the switch wire

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1 Answer

82 harley sportster brake light


try starting with the bulb. brake light bulbs are dual fillament, meaning you have 2 bulbs in one basicly. if your brake side has blown then the tail light could still work. Or try checking the brake light switches, one on front brake and one on rear brake pedal. to test switches disconect wires and join them together with small bit of wire or paper clip. this will make the light come on meaning you have a bum switch.
if you have only been using the rear brake, that has an adjustable switch, may need to mess with it

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