I have a 2000 HD sporster 1200 custom. The left turn signals (front and rear) along with the hazard lights do not work. The right turn signal works and the cancel of the left turn signal works when turining on the right turn signal. The bulbs are good and the switch for the left turn signal is good and has been tested for voltage. Any ideas on why the left signals and hazard lights just stopped working?

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.

Have you checked the light bulbs?

More information would be helpful.

Do any lights work, ie signals, four ways. Does rear brake light work and just not light when front brake is applied.

If all lights are dead did you check the lighting fuse?

Fuse panel is under the left side cover.

According to the schematic I'm looking at, your 1997 model Sporty came with front marker lights but not rear marker lights. To make sure, take the lens off of your turn signal light in the rear. Take the bulb out. Now, does the bulb have one or two filaments? If it only has one, then you don't have marker lights.

Let me know what you find.

Ride Safe
Steve

The rear left turn signal bulb must be replaced immediatly before it melts the light socket, if it has'nt yet. Also please verify that the correct light bulb is being installed. because even though many bulbs look the same they are not identical. Installing the wrong bulb can be the begining of many, many problems in the particular circuit

check the bulb

The only running lights will be the front. Make sure there are 3 wires going to the front turn signals. If not then you have a set of rears on the front. The wire color for the running light side is blue. That can be ( or should be ) attached to an Orange/ white wire ( that is a typical key on hot for Harley ) I would also double check the ground on them as well, since the turn signal can actually pick up a ground by back feeding through itself, but would still not let the running light to work

I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_5bac37c3cb991fdb

What may have happened is either the headlights wiring or the parking lights wiring somewhere along the wiring fused to the left turn signals wiring. Depending on if the turn signals go on when you put the parking lights on or the headlights on.

If the signals come on when you turn on the headlights than you only need to locate the light green wire that comes off the left turn signal harness.

Next follow that wire the entire way back to the firewall looking for another wire fused to that wire as you go.

If there are no signs of this you need to continue looking on the other side of the firewall all the way back to the turn signal and hazard flasher unit which is a black box that connects to a black harness located next to a grey harness behind the knee bolster.

But if the signals come on when you turn on the parking lights than you will also need to check the wiring from the rear left signal and follow that light green wire all the way back to the turn signal and hazard flasher unit.

This should fix your problem, but if not than your problem may lay within the the wiring between the turn signal/hazard switches and the turn signal and hazard flasher unit.

Also you may have a burnt circuit in the junction block. This block is where the light green from the rear left signal and front left signal meet. Don't have a description but if you cannot find it let me know and I will go out to the yard and look myself and let you know.