Question about 2003 Harley Davidson FLSTF Fat boy

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Turn Signal Installation

My 100th Anniv Fat boy came without turn signals. There are no wires to the bars or rear fender (other than brake lamp). Does anyone know (or have documentation) to install turn signals? The signals I purchased to install assumed the wiring was already there.
TIA

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  • Anonymous Mar 26, 2014

    i installed led turn signal lights and cant find the connection to install module

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Wow how did that happen , they should have, well you can by a after market kit that comes with the wiring harness for frt and rear. if it was me thats what i would do . that way you can install some costom lights be ready through they are not cheap kdc744

Posted on Jan 27, 2009

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Posted on Jan 02, 2017

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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 .

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My rear turn signals are not working. front turn signals work rear parking lights work brake lights work


In the diagram for rear lamp, the top wires are voltage, the bottom black wire is ground. The brown wire on either side should be tail lamps, goes hot when you turn on the headlamp switch. The other top wire on either should be for turn signal. With everything turned on, is there voltage on that wire?
Because the front works and the rear don't, possible wiring circuit problem? The voltage for turn signals comes from bcm. The bcm knows when you turn on turn signal switch, either side, then the bcm sends voltage to turn signal lamp at the rear and front.

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How do i remove rear turn signals on 2009 street bob?


If you need to remove the tail lite, brake lite and signal light harness start by removing the seat. Then disconnect the negative battery cable. Then detach the rear electrical harness connector. Then locate and follow the wires for the taillight and signal lights to the connector (8 pin) under the seat area and separate the connector. Then cut the cable tie strap holding the wiring harness to the frame and pull the harness through the fender opening. Then follow the conduit/harness back to the fender hole where the wiring exits the fender underside and enters the tail lite housing and backplate. This is not necessary for removal of the tail/brake lite assembly or the signal lie assemblies.

If you want to remove the tail/brake lite assembly remove the tail light lens and the with a small screwdriver depress the small tang in the tail lite four wire Multilock connector and remove the tail lite and then do the same and release the two wire signal light connectors one at a time from the tail lite base and remove the signal light connectors. These smaller two wire Multilock connectors are on the left and right sides of the base plate in the centre portions of the base plate where the 4 wire tail lite connector on the left side of the base plate is located and the wiring harness connector of the wires from the front of the bike to the base plate on the right side. The wires from the left and right signal lite assemblies go from these connection points on the base plate out through each side of the base plate and into the area under the back of the rear fender to each signal lite assembly. Then similarly release the Multilock connector of the harness from under the seat to the tail lite base. When you have disconnected the connectors from the base plate and have routed the wire harnesses out into the area under the fender you can release them from the wire clips at each side of the under fender areas. Then for each side remove the lamp support by unscrewing and removing the fastener and washer inside the rear fender, after which the lamp housing can be removed from the lamp support by pulling it and the wiring you disconnected from the tail lite base out through the lamp support. If you wish to release/remove the tail lite base undo the fastener and remove it.

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1 Answer

2002 fatboy left rear turn signal not working


Check and make sure the wires in the fender didn't come out the holders and were cut by the tire rubbing it. Had the same problem once.

Mar 01, 2013 | 2002 Harley Davidson FLSTF - FLSTFI Fat...

1 Answer

How or where do I unplug and then remove the rear turn signal from an '03 Fatboy?


The wire connection should plug into the taillight. Remove the lens and you will see what I'm talking about. You will need to remove the black connector after you unplug it and probably cut the silver plug off to get the wire through the standoff. If you're good at soldering, just cut wires about 2 inches from the black connector and solder them back together and coverr the splice with heat shrink when finished. Good luck!

Oct 27, 2012 | 2003 Harley Davidson FLSTF Fat boy

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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front turn signal wires should be routed down the right side of the backbone of the frame under the gas tank. they will be violet and brown wires along with 2 blacks for grounds.

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Here's my 2 cents... you need to remove the seat, saddlebags, disconnect battery, dsconnect the wiring harness, remove the signal lamps and the hardware securing the fender. There are torque values u need to know when installing the new one. This is all in the service manual for your model. I would go to the dealer and get one, you want all the specs correct and thats the only way to get em

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