Harley Davidson Forums - Electrical/Lighting/Alarm

Can Someone Identify This Box Please

pepper* — Mon, 18 May 2026 18:34:14 GMT

Guys - I have a New to me 2005 FXDLI
dont know Any of its history - except the Security System has been Disabled
by the dealer , and a cruise control has been installed ( by who , I don�t know )
Upon installing a battery tender , I found this box under the seat
it doesn�t have Any markings or part numbers anywhere
it�s getting power by what looks like an old telephone snap connecter
and the other end is plugged into a connecter that looks to be Harley

is this thing a part of the Security Delete - or cruise control

thanks Guys / Gals

Jim

2025 Street Bob ID Connectors?

Crunchy — Sun, 17 May 2026 23:44:07 GMT

We were working on my son's '25 Street Bob and noticed these connectors under his seat, clipped to the fender.

Anyone know what these are for?

throttle body plugs

bushy1 — Sun, 17 May 2026 01:49:54 GMT

hello I have just got a 2008 nightster that is missing a throttle body .where do the 5 wires or plugs plug in .I think 2 go to the injectors?

Plugs

06 Road King electrical power loss

boboz — Sat, 16 May 2026 17:53:04 GMT

I was riding my 06 Road king with 10,000 miles on it today. I was traveling around 60 miles an hour and it just hiccups for a second all the gauges went to zero the engine stopped and it came right back on. a few minutes later, I pulled into a service station and while leaving the bike running, I got off in a few seconds later it just died. I hit the starter and it started right back up. I rode it 20 miles after that without a problem.Something electrical just hiccups and kills it for a split second. Any ideas?

Self canceling signal feature not working

Trex — Fri, 15 May 2026 03:49:38 GMT

All the turn signals work fine, turn on and off but the self cancel feature not working. What causes that?

07 Ultra Classic Smoke/Short on start-up after 30 seconds

Terry0014 — Wed, 13 May 2026 22:18:21 GMT

Hello all,

I got my 07 Ultra Classic out this weekend and fired it up, oil pressure good, etc.. No problems until about 30 seconds in. Lots of smoke underneath and burnt wiring smell.
Shut it down immediately.

The location is on the right bottom side of the bike.
A connection has melted and apparently pulled out from a silver connection. See pics.

I've done a search and can't seem to tell if this is the oil pump, or something else. A little lost on what this wiring controlled or why it melted.
Please give insight so I can tell the shop exactly the issue for when I call to schedule.

Thank you

Terry

Diving light wiring issue

NewfieDan — Tue, 12 May 2026 11:15:52 GMT

I'm having a bit of an issue. Last year I changed out the stock headlight for LED and added a set of Driving lights to my wife's 2015 Freewheeler At that time all the lights were working. Last fall we changed the bars and added heated grips. Earlier this year, when we were down south, we noticed that her driving lights weren't working. Fast forward to today, when digging into why they weren't working, found a wiring connector looped back into itself.Sort of like plugging in a power bar to itself. Explains why the lights weren't working. I cut out the connector and connected the lights to the low beam of the LED headlight. When I tried them, I noticed that the headlight is on high beam. Disconnected the driving lights, but headlight is now high beam only.
I read on the inter-webs that the ECM controls the High/Low beam, and it reads the LED & Driving lights as too much load, and switched to high beam only to protect itself, if this is true, do I need to remove any codes off the ECM, and then add in an additional lighting relay?

Left Turn Signal not working when hot outside

SeabeeJosh — Mon, 11 May 2026 23:32:47 GMT

I have a 2001 Road King (FLHR), replaced all lights with LED and replaced the TSSM with a Custom Dynamics TSM so now it won�t hyperflash. Went that way instead of the inline resistor because my left turn signal does not work, but only when it�s warm out. Thought that may resolve it. No problems in the mornings, or when it�s cold, but by the afternoon, or when it warms up, only the left turn signal does not function. Also, I can�t make 4-way hazards work. The wiring all looks good. Could it be the switch if it works fine when cool?

Update: rested the switch, it works fine, but still no turn signal.

CPAP power from Data link plug

Koi1975 — Sun, 10 May 2026 14:36:28 GMT

2023 flhxs....
Im looking to charge my medistrom battery while Im riding that will power my cpap machine while i camp....I want switch power to not drain the bikes battery...Im looking to get a data link wiring harnass that either has an inverter to ac power inline or an adapter that will plug into an inverter and charge my external battery pack...

Preference to the inline as space is limited

Any help would be appreciated????
thnx

Track your bike/theft protection

Flyerdon — Sun, 10 May 2026 10:45:02 GMT

I've always pondered being able to reliably follow where my bike is in the event some scoundrel decides they need it more than me. I've seen several makes in the past but either the unit itself or the service for doing the actual tracking was more expensive than my wallet could handle. Then recently I came across a unit called Monimoto and it's both relatively inexpensive and the tracking service is the same. The unit ( I got the Monimoto 9) and the FOB come in a box that's only about 6" X 6" X 1" and the pieces themselves are about 1.5 X 3 X .75 and it will fit darned near anywhere on the bike. The only requirement is that no metal covers it because it uses both cell connection and satelite connection so it get GPS info. The unit was only $179 and the service is only $50 a year. After I installed the software on my phone and got it set up and all connected between the phone and the unit (both the unit and the FOB have internal batteries so there's no connection to the electrical system on the bike) I took it for a test spin of about 20 miles or so without the FOB so it was in alarm mode. It immediately called my phone to tell me the bike had been move and was moving. I finally stopped at my church to see what the tracking said and it showed me where I had been and where I stopped. It even showed a picture of the location where I stopped the bike with the cross streets where I was at. Anyone who is looking for such a device but doesn't want to spend a bunch should at least check out the thing.

relocate the voltage regulator

WesA — Mon, 04 May 2026 20:35:31 GMT

2015 HD Tri Glide. I would like to relocate my voltage regulator. Can I splice in a longer wire(s) between the stator and the voltage regulator?

broken electrical connectors

WesA — Sun, 03 May 2026 20:18:16 GMT

2015 tri Glide. The voltage regulator connector plug is damaged on the wiring harness side. Can I buy replacement connectors somewhere?

Custom Dynamics Smart Triple Play - No Brake Light

Klayman — Sat, 02 May 2026 20:06:57 GMT

Hoping some folks here may have tips I can try to sort this out. I had called CD this week to sort an issue with the LED's not having much of a difference between run/brake (using the TFC2 or TFC3 module with hardly any difference) and they suggested the Smart Triple Play (CD-TPU-SS-HD).

For what it's worth, the previous owner added the stretched fender & bags and had chopped up the rear wiring a fair bit. The harness appears to be in tact and I've put the STP inbetween the connectors, which then goes to an unmarked black box (I believe this is the TSM? 5 wires input and 4 wires output) then wires split between left and right rear fender. There is no center tail light, just two custom cut embedded lights (left/right) and two LED strips on the bags just below the lid lip (both are CD Trueflex red two-wire lights). Prior to flipping in the STP module there was a TFC2 module on each side to give the run/brake/turn function and worked fine, with the exception that light intensity was hardly different between run and turn/brake.

So, I have the STP installed and working great for run/turn, but have no brake light functionality. I've tried the reset procedure and all four SW-1/SW-2 settings and the most I get out of it is a single blink when brakes applied and then all lights go off. If I turn on either signal the lights work as expected, but with brake held there is no brake light function (with signals on or off).

I'm going to call CD again on Monday when they open up, but hoped someone may have some ideas I can try while waiting for Monday?

1996 FXDWG headlight ground?

Vamisk — Thu, 30 Apr 2026 16:32:34 GMT

Am I understand that the black wire is grounding right to the headlight mount? Someone took the light off this bike and chucked it a while back so I don�t have a starting point of reference.

Anyone know if these will fit....

RagmanZL — Wed, 29 Apr 2026 11:53:36 GMT

Found what looks like a good deal on Turn signals. I have a 2018 SGS. Does anyone know if these will fit without modification? (The link is not for the deal I found but the same lights)

https://spazcycle.com/products/open-...oaAmLbEALw_wcB

Thanks.