I am the proud owner of a 2003 Heritage Softail Classic, 100 year anniversary issue. My problem is I've recently discovered my tail lights and brake lights have gone out. Turn signals work. I checked the bulb, bulb was blown. After replacing it, I still don't have any lights. Checked fuses, no fuses were blown. Checked wires, to the best of my ability, and found no damage. Any help will be appreciated. I'm missing some good riding days.

 

The 2003 bikes have pretty simple lights, unlike the canbus/BCM operated bikes....

Time to get out the voltmeter and start working from the bulb socket backwards to find out where you "lost" 12 volt power....

I noticed one quirk on my 2003 Heritage.... when I had a front turn signal bulb go out.... the opposite side, rear, turn signal flashed, until I got the bulb fixed... I have an older run/turn/brake module for my rear lights, so I suspect the quirk came from that. Once the bulb was replaced, it all worked well..

If you have a run/turn/brake module for your rear lights, or an LED bulb signal stabilizer... you may want to start your check with them....

 

I noticed that when I turn the turn signals on, the right one blinks normal, but the left one blinks a little faster than normal. And when they are blinking, the rear light flashes. I haven't put a volt meter on anything yet, but I'm starting to lean towards the module being bad.

 

To recap, you are saying turn signals work, brake light/tail light doesn't, but when the turn signals flash, the rates are different and the tail light flashes.....???


If you have a run/turn/brake module on your bike, you never mentioned you had one, I'm betting the problem is with the module....

Easy to check. Remove the R/T/B module form the rear wiring harness. You can leave it in place for the check, just connect the OEM wires back the way they were. If the problem disappears, you know the R/T/B module has issues..... trash it and replace it with a new one...

Good luck with the fix.....

 

Check the grounds.

 

Thank you