[Dan89flstc]

The headlight circuit and the running light circuit are separate, one is powered by the headlight fuse, the other is powered by the lighting fuse.

Check the wires between the headlight and lighting fuses and the lighting relay.

Also check the wire between the lighting relay and the wire going into the ignition fuse (black/red), and the wire between the lighting relay and the ECM power fuse (red).

If it were the ignition switch, you would see problems with other circuits as well...

If you have voltmeter handy when the problem occurs, check voltage at terminal 86, 87 and 30 on the lighting relay.

No voltage at 86= bad connection between relay and the wire supplying power to the ignition fuse.

No voltage at 30= bad connection between relay and the wire going in to the ECM Power fuse.

Power at 30 but no power at 87 means the relay is bad.

 

[Dan89flstc]

Good luck, keep us posted.

 

[Dan89flstc]

:thumbsup As Gotgold said try your brights. Factory wiring is set so passing lamps shut off when high beams are turned on, so it could be in the switch. Could also have the pigtail installed that bypasses letting passing lamps stay on when high beam is on, maybe a problem with the pigtail if it has it.

When trying to diagnose an electrical problem you need to look at the wiring diagram.

It is not the headlight (dimmer) switch, if the headlight switch was the problem only the headlights would be affected.

The OP`s bike has a problem with the headlights and the running lights.

You have to trace those two circuits back until you find a common source of power that will affect only those two circuits.

The common source is the two wires that power the lighting relay, the relay itself, or the wires between the relay and the lighting and headlight fuses.

 

[Dan89flstc]

Running lights are the lights that are on whenever the ignition is on.

There are running lights in the front turn signals, and in the rear there are running lights in the tail light, and also on some tour packs etc.

The 4-1/2 inch beams on the front light bar are not running lamps, they are Auxiliary lamps or Passing lamps.

If the OP has an issue with the larger 4-1/2 inch passing/auxiliary lights, that is a different story.

OP: is your issue with the running lights or passing lights?

 

[Dan89flstc]

I also refer to them as Passing/Auxiliary/fog lamps, but believe it or not some parts of the country do refer to them as running lights. Go to Ebay and type harley running lights and you will see a few listed.

Look on the wiring diagram in the service manual.

Running lights are the lights that are in the front directionals and the tail light. Fender tip lights and tour pack marker lights will also use this circuit.

The 4-1/2 inch lights on the front are called Aux lamps.

 

[Dan89flstc]

Ok RoadKingAl...

How about clarifying which lights are not working so that we are all on the same page...

 

[Dan89flstc]

There are 9 fuses and three relays on an `02 touring bike...

Replace the lights fuse, don`t bother looking at it, just toss it and put a new one in.

Replace the "Key Switch Ignition Relay". That is what sends power to the lights fuse.

Try swapping it with one of the other relays for a quick check.