Road Glide DRL Not Working? Here's Why — and the Exact Fix
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If you've installed our 240W Road Glide LED Dual Headlight and noticed the DRL only lights up when the auxiliary switch is turned on — but stays dark during normal riding — you're not alone. This is the most common installation question we receive for this product, and the good news is the fix is simple once you understand what's happening.
1. The Short Version
The DRL wire on your headlight harness is connected to the Auxiliary (ACC) circuit instead of an Ignition-switched 12V source. The AUX circuit only receives power when the auxiliary switch on the dash is activated. To make the DRL come on automatically whenever the bike is running, the DRL wire needs to be moved to a wire that goes live when the ignition key is turned to the "IGN" position. This is not a product defect — it's a wiring tap that the Road Glide's factory harness does not provide automatically.
2. Why the DRL Only Works on the Auxiliary Switch
To understand the issue, it helps to know a bit about how Harley-Davidson's factory wiring is laid out on the Road Glide.
The Road Glide's factory harness includes several different power circuits, and they don't all behave the same way:
| Circuit | Wire Color (typical) | When is it live? |
|---|---|---|
| Constant battery power | Red | Always — key off or on |
| Ignition-switched power | Orange/Red or Orange/White stripe | Key in IGN position only |
| Auxiliary switch power | Orange (solid) | Only when AUX switch on dash is pressed |
| Ground | Black | Always |
The DRL on our headlight needs a connection to the ignition-switched circuit — power that turns on automatically when you start the bike and turns off when you shut it down. The Road Glide's factory harness does not include a dedicated DRL circuit, so during a plug-and-play installation, the DRL wire can end up connected to the AUX circuit instead. The result: DRL only lights up when the auxiliary switch is engaged.
3. Is This Your Problem? Check These Three Things
Before diving into the fix, confirm that this is the issue you're experiencing:
DRL works in auxiliary mode
Flip the handlebar to ACC or auxiliary position — the DRL lights up normally.
DRL is off during normal riding
With the key in ignition mode and no auxiliary switch activated, the DRL does not illuminate.
High beam and low beam work fine
Both main beam functions operate normally — only the DRL is affected.
If all three match your situation, this guide is exactly what you need.
4. The Fix: Re-Tap the DRL Wire to a Switched IGN Source
The fix involves disconnecting the DRL wire from the auxiliary circuit and connecting it to an ignition-switched 12V wire instead. Here is the step-by-step process.
Before you start: Turn the ignition completely off and let the bike sit for a minute before touching any wiring. A multimeter set to DC voltage is recommended but not required if you're confident identifying the correct wire.
1. Remove the inner fairing to access the wiring area behind the headlight assembly. On 2015–2024 Road Glide models this involves removing the windshield screws and the top vent trim piece.
2. Locate the DRL input wire from our harness. It is labeled in the wiring diagram included with your product. It will be the wire currently connected to the auxiliary circuit — not the main headlight connector.
3. Disconnect the DRL wire from its current connection to the accessory or auxiliary circuit.
4. Find an ignition-switched 12V wire in the fairing area (see Section 5 below for specific locations on the Road Glide). This is a wire that reads approximately 12V when the key is in IGN position, and 0V when the key is off or in ACC mode.
5. If using a multimeter: Set it to DC voltage. Probe candidate wires with the key in IGN mode and look for one showing ~12V. Then switch to ACC mode — the correct ignition-only wire will drop to 0V.
6. Tap the DRL wire into your identified ignition-switched 12V source using a quality tap connector, or solder and heat-shrink for a more permanent connection.
7. Reinstall the fairing, turn the key to ignition, and confirm the DRL illuminates automatically without touching the auxiliary switch.
Expected result: After reconnecting correctly, the DRL will come on automatically every time you start the bike. It will turn off when the ignition is off. This is a one-time adjustment — estimated 15 to 20 minutes for most riders.
5. Where to Find Switched 12V Power on a Road Glide
The Road Glide's ignition-switched power is available in several convenient locations inside and behind the fairing. Below are the most reliable options, from easiest to access to most reliable long-term.
Option A — Spare 2-pin accessory plug inside the fairing (easiest)
Many 2015–2024 Road Glides have a spare 2-pin plug located inside the fairing, near the turn signal connector on the throttle side of the radio. It is live whenever the ignition is on. Remove the windshield and top vent trim to access it without a full fairing teardown. This is the cleanest option if your bike has it — no splicing required.
The plug housing is OEM part number 73152-96BK. Pin terminals are HD-73191-96 if you need to build a mating connector.
Option B — Orange/White stripe wire in the headlight area
The ignition-switched power wire in Harley's factory harness is typically orange with a white stripe. Behind the fairing, near the main headlight harness, you will often find this wire accessible with blade-type terminals. It is hot in IGN mode only. This is the same wire Harley-Davidson's own accessory installation manuals reference for powering switched accessories.
Do not tap into the gray wire at the Data Link connector — this wire supplies switch power to the ECM and is not suitable for powering accessories.
Option C — Fuse block (most reliable)
Adding an inline fuse tap to the ignition fuse in the fuse block is the most electrically clean method. It ensures proper fuse protection for the DRL circuit and does not share current with other accessories. Use a fuse tap rated for the DRL's current draw.
6. FAQ
Questions? Reach out to our support team and we'll be happy to help.
