Question about 2000 Harley Davidson XL 1200 C Sportster Custom

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When I use the front brake the brake light

When I use the front brake the rear brake light does not come on and when I use the turn signals
both left and right turn signals come on I have inspected the wiring under the seat and in the head light but see no broken wires when the foot brake is used the brake light does come on

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  • rtpflh
    rtpflh Apr 01, 2017

    inspect light bulbs for broken filament,check flasher



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  • Master
  • 546 Answers

Remove switch cover on front brake master assembly. check connections at brake cyl.switch,check wires were not 'pinched' by cover against handle bar

Posted on Sep 28, 2009

  • Nate Williams Apr 01, 2017

    Switched the rear light bar on my 16 street glide with a factory powder coated one. I have brake and turn signals that work on the rear but no rear running lights. Have checked all connections and fuses. Bottom fender running light will work but once you plug in the plug for the light bar all running lights will go out. Have no clue what could be wrong

  • rtpflh
    rtpflh Apr 01, 2017

    trace your ground wires.if lights have one wire,remove some powdercoat to provide good ground,or run a ground wire from light bar to frame.



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08 Buick lucerne cxl. Third brake light works as well as front signal lights. No rear brake lights or turn signals. Tail lights and headlights and third brake lights works. Bulbs good. Help

Stop Lamps
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 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 is applied, the BCM will then apply battery voltage to the left and right stop/turn signal 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 applies battery voltage through the signal circuit to the transmission control module (TCM) and the engine control module (ECM) indicating that the brakes are applied.
Ground for the stop lamps is supplied as follows:
• G402 provides ground for the left rear stop/tail/turn signal lamps
• G403 provides ground for the right rear stop/tail/turn signal lamps
• G301 provides ground for the CHMSL
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.
Battery voltage from the LT TRN/SIG and RT TRN/SIG fuses located in the rear fuse block is also used by the body control module (BCM) for stop lamp operation.

Turn Signal Lamps
Battery voltage supplied to the body control module (BCM) from the fuses listed below is used for turn signal and hazard lamp operation.
• LT TRN/SIG fuse for the left turn signals
• CTSY/RF TRN fuse for the right front turn signal
• RR TRN/SIG fuse for the right rear turn signal
When the turn signal switch is place in either the LEFT or RIGHT position, ground from G300 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. At the same time the BCM sends a GMLAN serial data message to the instrument panel cluster (IPC) to cycle the appropriate turn signal indicator ON and OFF.
Ground for the turn signal lamps is supplied as follows:
• G104 provides ground for the left and right front turn signal lamps
• G402 provides ground for the left rear stop/tail/turn signal lamps
• G403 provides ground for the right rear stop/tail/turn signal lamps

Do you have a factory scan tool (tech2) ? Your best bet , take it to the dealer .

Sep 08, 2017 | Buick Cars & Trucks

1 Answer

Left bleaker and break light not working. Turn signal works bleaks faster than right side.

Has the vehicle been in an accident on the left rear side. First check the bulb to be sure it is not defective, trade it out with the side that works properly to test. If the bulb works well then My thought are you may have a shorted wire. The turn signal flasher works by heat build up within the flasher the heat is caused by the load of the bulbs, the load heats the metal spring causing it to open the circuit then as quickly as it cools down the circuit closes again lighting the bulbs.
There is also a possibility of a defect in the turn signal mechanism on the steering column. The turn signal switch on many models does three different things on many models that use the same bulb element / or bulb for brake and turn on rear of vehicle. It controls the circuit for brake light by sending power both left and right side rear when turn signal is in neutral position then when turn signal is in left turn the switch cancels brake light power to left side rear and supplies flasher power to left side while maintaining brake light supply to the right side rear, and so on opposite when the right turn is chosen on turn signal switch. The turn signal indicators on the dash normally run off the same circuit as front turn signal bulb only which is also controlled by turn signal switch. Front has turn signals but no brake light.
I think there is an additional load on the left side rear turn circuit and it could be either a wire that is shorted or the turn signal switch if the same bulb element is used for both functions.
Often times if trailer lighting is connected the flasher will also blink a little faster because of the extra load of additional bulbs.

Feb 15, 2015 | Cars & Trucks

2 Answers

Turn signal

because of no light flasher on left side the front one will go faster .maybe the left rear light is burn. and brake lights are control by the brake switch on brake pedal hardware, might be unadjust

Sep 12, 2013 | 2001 Pontiac Grand Prix

2 Answers

1991 Nissan Pathfinder left turn signal comes on when I apply the brake

check that all your bulbs are correct and are making contact. this commonly happens when a wrong bulb is installed in a socket. the other reason this happens is a bad ground, and one bulb uses another as a ground path. I would start at the rear left light and check that everything is good there, then move on to the front. 99 percent of these kinds of problems are at the lights themselves.

Mar 21, 2013 | Cars & Trucks

1 Answer

95 dodge neon brake lights and rear turn signal will not work,

The fast blinking is usually a bulb burned out. Replace the rear bulbs. If this is not the problem , it may be a ground issue, but it really does sound like a bulb issue. Also inspect the light socket while you are there. Look for any bad corrosion Good luck

Jan 04, 2013 | Cars & Trucks

1 Answer

Jaguar xj6 break light cancels signal

Replace the turn signal switch. Bad contact inside causing a crossing of the circuits. When the turn signal is applied it should open the brake light circuit allowing for just the signal to work. Doesn't sound like the switch is doing it's job.

May 23, 2010 | 1989 Jaguar Vanden Plas

1 Answer

1989 Cadillac rear lights stay on

It may be a turn hazard module under dash.that is the culprit! The power to the third brake light does not go through the module, but the rear brake lamps power is controlled through this module. I am looking at a drawing of one and it looks like it has two connectors with about five wires in one and six in the other. It has some cooling fins on it also.

May 30, 2009 | 1989 Cadillac Brougham

1 Answer

Brake light and turn signal light not working

Did the new lens come with new sockets? If not damage may have occured there that you cant see. only other possibilty is wiring damage in the rear that may be hard to see. The condition you describe is simple "backfeeding" if you look hard enough youll either find bad sockets or damaged wires close to the lens that took the hit. Hope this helped. Thanks

Apr 06, 2009 | 2004 Jeep Liberty

1 Answer

Chev Cavalier 2003 only one rear turn/brake/hazard light

I have a 2002 Chev Cavalier that had the same exact problem. I replaced the bulb harness (purchased from a chevy dealership for around $5) which was fairly easy to do. I have had zero problems with it since.

Sep 15, 2008 | 2001 Chevrolet Cavalier

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