How to Install Micro Signals on Your Motorcycle

Quick answer

Installing micro turn signals is a plug-and-play job on most bikes when you use a complete kit: mount the signals on their brackets, connect the wires, and fit the matching LED relay so the flash rate stays correct. The Yoshimura GROM 2022-26 Front Micro Turn Signal Kit bundles the lights, 3D-printed mounting plates, and hardware so you are not fabricating brackets. Work one side at a time, test before you button everything up, and never leave bare LED wiring connected without the correct relay.

Micro signals look simple, and on a bike that already has a complete kit they mostly are. The part that trips people up is not the light itself; it is the relay, the polarity, and the bracket alignment. Get those three right and a motorcycle micro signal install takes about an hour in a garage with basic hand tools.

This guide walks through the order that keeps you out of trouble: check the kit, prep the bike, mount, wire, relay, then test. It uses the Yoshimura micro signal kit and the Sequential LED Rear Turn Signal Kit as working examples because both ship with the parts most generic LED micro signals leave out.

Before you start: what a complete kit includes

A complete micro signal kit should give you the lights, the mounting hardware or plates, and a wiring path that matches your bike. The Yoshimura GROM 2022-26 Front Micro Turn Signal Kit is built this way: it includes the Micro Lights plus custom mounting plates that are 3D printed with Onyx, a nylon mixed with non-continuous carbon fiber, which gives the brackets high strength without adding bulk. That matters because a dime-sized signal still has to survive vibration and road debris.

If your kit does not include a relay, plan to buy one. LED micro signals draw far less current than the incandescent bulbs they replace, and a stock flasher will often hyperflash or fail to flash at all. The Sequential LED Rear Turn Signal Kit w/ 7 pin Relay solves this by pairing the signals with a relay from TST Industries, and the kit is designed so the flash rate is easy to adjust.

• Lay every part on a clean towel before you touch the bike so you notice a missing connector early.
• Confirm the kit is listed for your exact model year; bracket fitment is model-specific.

Step 1: Disconnect power and remove the stock signals

Turn the key off and disconnect the battery negative terminal before you cut or unplug anything. Then remove the stock signal housings. On most bikes this means one or two bolts or a single plastic retainer per side, plus a connector behind the fairing or under the tail. Keep the stock parts in a bag; if you sell the bike later, a buyer may want them.

The common mistake here is pulling on the wire instead of releasing the connector tab. That stretches the harness and creates an intermittent fault that is miserable to diagnose later. If a connector will not release, look for a locking tab rather than adding force.

• Photograph the stock wiring routing before removal; you will want the reference when you route the new leads.

Step 2: Mount the new micro signals and brackets

Fit the mounting plates or brackets to the bike first, then attach the signal bodies. On the Grom front kit, the 3D-printed plates are shaped to put the Micro Lights in the stock location, so you are not drilling or bending anything. Snug the hardware by hand, check the angle from the rider's view, then tighten. A signal that points at the ground or into the fairing is both unsafe and an instant inspection fail in most places.

Do not overtighten small signal stems. The housings are compact and the threads are fine; firm is enough. If a bracket feels like it is flexing, you have the plate oriented wrong, not a hardware problem.

• Check clearance at full steering lock before final tightening.
• Route the signal wire so it does not rub the fork or brake line through the steering range.

Step 3: Wire the signals and match polarity

Connect the signal leads to the bike harness using the supplied connectors or your preferred crimp-and-seal method. LED micro signals are polarity sensitive: if a signal does not light, swap the two leads before assuming the unit is dead. Work one side at a time so you always have a known-good reference on the other side.

Keep the wiring away from exhaust heat and sharp frame edges, and leave a small service loop so the connector is not under tension. If you are installing a sequential rear kit, follow the kit's lead order exactly; sequential function depends on the correct wire sequence, not just a good connection.

• Test each signal with a temporary connection before you zip-tie the harness permanently.

Step 4: Fit the LED relay and set the flash rate

Replace the stock flasher with the LED-compatible relay included in your kit, or with the correct relay for your bike if your kit does not include one. The Sequential LED Rear Turn Signal Kit w/ 7 pin Relay uses a TST Industries relay and is designed so the flash rate is adjustable, which is useful if you later add or remove LED loads. Plug it into the stock relay socket, then test.

The mistake to avoid is skipping the relay because the signals happen to blink on the bench. A stock flasher may work cold and then hyperflash once the bike is running and voltage rises. Set the rate to a steady, legal cadence and confirm it stays consistent with the engine running.

• If one side flashes faster than the other, recheck that side's ground and connector before blaming the relay.

Step 5: Final test and cleanup

With the battery reconnected, test left, right, and hazard functions with the engine off and then running. Walk around the bike and check that each signal is visible from the front, rear, and side angles required in your area. Confirm the indicators do not interfere with the headlight, taillight, or brake light behavior.

Finish by securing the harness with zip ties at the same points the factory used, trimming excess tie tails, and rechecking fastener torque on the brackets. A short test ride at low speed over a few bumps will reveal a loose bracket or a wire that needs more slack before it becomes a roadside problem.

• Recheck all four signals after the first ride; vibration settles new hardware.

Install steps at a glance

1. 1. Verify the kit contents: Lay out lights, brackets, hardware, and relay. Confirm the kit matches your exact model year before disassembly. Checkpoint: if the relay is missing, order it before you start.
2. 2. Disconnect the battery and remove stock signals: Key off, negative terminal off, then release connectors by their tabs rather than pulling wire. Mistake to avoid: stretched harness wires cause intermittent faults.
3. 3. Mount brackets and signal bodies: Fit plates first, check angle and steering clearance, then tighten by hand-firm. Checkpoint: signal should be visible from front, rear, and side.
4. 4. Connect wiring with correct polarity: One side at a time, test before securing, and swap leads if a signal does not light. Mistake to avoid: assuming a dead LED when polarity is reversed.
5. 5. Install the LED relay and set flash rate: Plug the LED-compatible relay into the stock socket and adjust the rate with the engine running. Checkpoint: steady flash at idle and at revs.
6. 6. Final test and secure the harness: Test left, right, and hazards, then zip-tie the harness at factory points and recheck torque. Next step: recheck all signals after your first ride.

Parts that make this install easier

• GROM 2022-26 FRONT MICRO TURN SIGNAL KIT: A custom kit that includes everything needed to install Yoshimura Micro Lights on a Honda Grom, with 3D-printed mounting plates made from Onyx, a nylon mixed with non-continuous carbon fiber for high strength. You get model-specific brackets instead of fabricating mounts, which removes the hardest part of a micro signal install.
• SEQUENTIAL LED Rear Turn Signal Kit w/ 7 pin Relay: Pairs Yoshimura LED turn signals with a relay from TST Industries, and the kit is designed to be easier to install with an adjustable flash rate. The included relay solves the hyperflash problem that stops most LED signal installs, and the adjustable rate lets you fine-tune the blink speed.

A micro signal install comes down to three things: the right brackets, correct polarity, and an LED-compatible relay. Start with a complete kit so you are not chasing parts mid-job, test at every stage, and secure the harness like the factory did. Do that and your micro turn signals will be brighter, cleaner, and more reliable than the stock units they replaced.