Accessories, Comfort, and Optional Equipment
Chapter Introduction
This chapter covers the installation, diagnosis, and repair of accessories, comfort systems, and optional equipment found on modern motorcycles. For the Red Seal exam, you must master not only the mechanical aspects, but also Canadian electrical standards, safety procedures, and load calculations. This content represents approximately 8 to 12% of the exam questions, depending on the task distribution records.
Accessories include heating systems (grips, vests), audio systems, GPS units, auxiliary power outlets, alarms, communication systems (Bluetooth intercoms), luggage racks, windshields, saddlebags, and tire pressure monitoring systems (TPMS). Each category presents specific challenges regarding installation, electrical load, and compatibility with the vehicle's system.
Auxiliary Electrical Systems
Load Calculation and Circuit Capacity
Before installing any electrical accessory, you must calculate the total load that the vehicle's charging system can support. The basic formula is:
P = U × I (power in watts = voltage in volts × current in amps)
For a typical motorcycle with a 350 W alternator at 14 V:
Maximum available current: I = P ÷ U = 350 W ÷ 14 V = 25 A
Reserve for the motorcycle itself (ignition, fuel injection, lighting): 15 to 18 A
Available reserve for accessories: 7 to 10 A
Calculation Example:
| Accessory | Power (W) | Current at 14 V (A) |
|---|
| Heated grips | 40 W | 2.86 A |
| Heated vest | 60 W | 4.29 A |
| GPS | 10 W | 0.71 A |
| USB outlet (charging) | 15 W | 1.07 A |
| **Total** | **125 W** | **8.93 A** |
If the total exceeds the available reserve, you must either reduce the load, recommend a high-output alternator, or use a load management module that prioritizes accessories.
Canadian Electrical Code Rules
The Canadian Electrical Code, Part I (C22.2) applies to road vehicles, including motorcycles. The relevant rules for accessories:
Rule 5-102: Grounding conductors — the negative circuit must be securely fastened to the chassis.
Rule 8-200: Load calculation — the total load must not exceed 80% of the rated capacity of the supply circuit.
Rule 12-100: Conductors — wires must be of appropriate gauge (AWG) for the current carried.
Wire Gauge (AWG) and Ampacity Table:
| AWG Gauge | Max Current (A) at 60 °C | Typical Use |
|---|
| 18 AWG | 7 A | GPS, small accessories |
| 16 AWG | 10 A | Heated grips |
| 14 AWG | 15 A | Heated vests, auxiliary outlets |
| 12 AWG | 20 A | Main accessory power supply |
| 10 AWG | 30 A | High-output alternator |
Rule 14-100: Overcurrent protection — each accessory circuit must be protected by a fuse or circuit breaker rated at 125% of the accessory's rated current.
Example: For a 60 W heated vest (4.29 A at 14 V), the fuse must be 4.29 A × 1.25 = 5.36 A → use a 5 A or 7.5 A fuse depending on availability.
Installing an Accessory Wiring Harness
The recommended procedure for installing an accessory circuit:
28.Disconnect the battery — always start with the negative terminal, then the positive.
29.Choose the power source point — ideally directly from the battery via a relay controlled by the ignition switch (to prevent battery drain).
30.Install an auxiliary fuse block — with individual fuses for each accessory.
31.Route the wires — away from heat sources (exhaust), moving parts (fork, steering), and sharp edges. Use rubber grommets at points where wires pass through the frame.
32.Secure the wires — with zip ties every 15 to 20 cm.
33.Check continuity — with a multimeter before reconnecting the battery.
34.Reconnect the battery — positive terminal first, then negative.
35.Test operation — with the engine running, check the voltage at the point of use (should be between 13.5 and 14.5 V).
Common Electrical Installation Pitfalls
Inadequate grounding: A poor ground connection causes voltage drops, overheating, and intermittent malfunctions. Ground resistance must be less than 0.1 Ω.
Oversized fuse: A fuse that is too large does not protect the wire — the wire overheats and can cause a fire.
Direct battery connection without a relay: The accessory remains powered at all times and drains the battery (leakage current > 50 mA).
Twisting wires together instead of soldering or crimping: Twisted connections increase resistance (ΔR) and create hot spots.
Heating Systems
Heated Grips
Heated grips are among the most popular accessories. Two main types:
45.Fixed-resistance grips: Constant power, controlled by a switch (high/low).
46.Thermostatically controlled grips: Built-in temperature sensor, maintains a constant temperature (typically 35 to 45 °C).
Typical Specifications:
| Parameter | Value |
|---|
| Operating voltage | 12 V (14 V with engine running) |
| Power per grip | 20 to 30 W |
| Resistance per grip | 4.8 to 7.2 Ω at 14 V |
| Total current | 2.9 to 4.3 A |
| Maximum temperature | 60 °C (surface) |
Resistance calculation formula: R = U² ÷ P = 14² ÷ 25 = 7.84 Ω per grip.
Installation Procedure:
51.Remove the original grips (compressed air or silicone solvent).
52.Clean the handlebar with a degreaser — the surface must be free of grease.
53.Apply the supplied adhesive (usually a thermally conductive adhesive) to the inner surface of the grip.
54.Slide the grip onto the handlebar and rotate it to distribute the adhesive.
55.Allow 24 hours to dry before use.
56.Route the wires along the handlebar, leaving a service loop at the steering head to prevent strain.
57.Connect to the accessory circuit with a 5 A fuse.
Troubleshooting:
| Symptom | Probable Cause | Test |
|---|
| Grip does not heat | Broken wire, blown fuse | Check continuity with a multimeter |
| Heats too much | Defective thermostat | Measure resistance (should be within specified range) |
| Heats intermittently | Loose connection | Wiggle the harness while measuring voltage |
| Only one grip heats | Internal resistance broken | Measure R between the two ends of the wire |
Heated Vests and Clothing
Heated vests typically connect via a waterproof connector (coaxial or 2-pin type). They are controlled by a separate thermostat.
Characteristics:
Power: 40 to 90 W depending on size and model
Current: 2.9 to 6.4 A at 14 V
Resistance: 21.8 to 48 Ω (complete vest)
Standard connector: in-line connector with bayonet locking
Important Safety Rule: Never connect heated clothing directly to the battery without a fuse. The short-circuit current of a motorcycle battery can exceed 200 A — enough to melt the wire and cause a fire.
Audio and Communication Systems
Installing an Audio System
Motorcycle audio systems (handlebar speakers, subwoofers) present unique challenges:
Ambient noise: At 100 km/h, sound levels reach 90 to 110 dB. The system must produce at least 100 dB to be audible.
Vibrations: Components must be mounted on vibration-dampening supports.
Waterproofing: Minimum IP65 rating for exposed components.
Audio Power Calculation:
RMS (Root Mean Square) power is the true measure of continuous output. Peak power is typically 2 to 4 times the RMS power.
P = U² ÷ R where R is the speaker impedance (typically 4 Ω).
For a 50 W RMS amplifier into 4 Ω:
Output voltage: U = √(P × R) = √(50 × 4) = 14.14 V RMS
Input current: I = P ÷ U_battery = 50 ÷ 14 = 3.57 A (per channel, assuming 100% efficiency — in reality, efficiency is 60 to 70%, so actual current ≈ 5.1 A)
Rule 8-200 of the Canadian Electrical Code: The total circuit load must not exceed 80% of capacity. If the alternator provides 25 A and the motorcycle consumes 18 A, the reserve is 7 A. A 50 W × 2 channel amplifier draws approximately 10 A — this exceeds the reserve. You must therefore:
82.Use a high-efficiency amplifier (Class D, > 85%).
83.Add an auxiliary battery (isolated by a separator).
84.Recommend a high-output alternator.
Bluetooth Systems and Intercoms
Communication systems (Bluetooth helmets, rider-passenger intercoms) have become standard. Technical points to know:
Range: 500 m to 1.6 km in open field (according to Bluetooth Class 1 standard).
Battery life: 8 to 15 hours of conversation, 30 days on standby.
Latency: 30 to 50 ms for audio transmission — acceptable for conversation, but noticeable for music.
Multipoint pairing: Allows connecting two phones simultaneously.
Common Problems and Solutions:
| Problem | Cause | Solution |
|---|
| Pairing impossible | Pairing mode not activated | Hold the multifunction button for 5 seconds |
| Audio dropouts | Interference or excessive range | Move devices closer, check for metal obstacles |
| Echo during calls | Microphone too sensitive | Reduce microphone gain in settings |
| Rapid battery drain | Outdated firmware | Update firmware via the app |
Navigation and Instrumentation Systems
Installing a GPS
The GPS must be mounted so that it does not obstruct the view of the speedometer or the handlebar's turning range. Technical points:
Power supply: Dedicated power cable with a 2 A fuse (the GPS draws 0.5 to 1 A).
Antenna: Must have a clear view of the sky (do not place it under a metal component).
Waterproofing: Minimum IPX7 rating for use in rain.
Mounting: Anti-theft mount with security screws.
Electromagnetic Compatibility: The GPS can interfere with the ignition system if the power cable is routed parallel to the spark plug wires. Maintain a minimum distance of 15 cm between these cables.
Tire Pressure Monitoring Systems (TPMS)
TPMS is mandatory on new motorcycles over 400 cm³ sold in Canada since 2021 (Canada Motor Vehicle Safety Standard, article 138).
Two Types:
105.Direct sensors: Measure actual pressure in each tire, transmit via radio frequency (433 MHz or 315 MHz) to the receiver.
106.Indirect sensors: Use ABS wheel speed sensors to detect a difference in wheel diameter.
Direct Sensor Specifications:
| Parameter | Value |
|---|
| Measurement range | 0 to 6.9 bar (0 to 100 psi) |
| Accuracy | ± 0.07 bar (± 1 psi) |
| Battery life | 5 to 7 years |
| Operating temperature | -40 °C to +125 °C |
| Transmission frequency | 433.92 MHz (Europe/Canada) or 315 MHz (North America) |
Sensor Replacement Procedure:
110.Remove the tire from the rim (protect the rim with pads).
111.Remove the sensor mounting nut (torque: 4 to 6 N·m — do not exceed, risk of cracking the sensor body).
112.Install the new sensor with a new O-ring.
113.Inflate the tire to the recommended pressure.
114.Perform the binding procedure according to the manufacturer's manual — typically by placing the receiver in learning mode and deflating/inflating the tire to trigger transmission.
Exam Trap: The TPMS sensor torque is often given in N·m (4 to 6 N·m), not lb-ft. Convert: 1 N·m = 0.7376 lb-ft, so 5 N·m ≈ 3.7 lb-ft.
Alarms and Anti-Theft Systems
Types of Alarms
119.Shock alarm: Piezoelectric sensor that measures vibrations. Adjustable sensitivity (often 1 to 10 levels).
120.Motion alarm: 3-axis accelerometer that detects vehicle movement.
121.Proximity alarm: Detects a person within 1 to 2 meters.
122.Remote-controlled alarm: Remote control, remote start function (on certain models).
Electrical Consumption: An alarm in standby draws 2 to 10 mA. A 12 Ah battery can therefore power the alarm in standby for 12 Ah ÷ 0.01 A = 1200 hours (50 days) without starting. If consumption exceeds 10 mA, the battery will discharge in less than 30 days — a common problem during winter storage.
Installing an Alarm
125.Location of the control unit: Under the seat or behind a side panel — inaccessible without tools.
126.Connections:
Constant power (red wire): directly to the battery via a 5 A fuse.
Ignition (yellow wire): to the ignition switch's accessory wire.
Turn signals (green/orange wires): to the left and right turn signal wires.
Shock sensor: securely attached to the frame with double-sided tape.
131.Sensitivity adjustment: Start at level 3 (out of 10), test by striking the fairing with the palm of your hand. Adjust in increments of 1.
Safety Rule: The alarm must never interrupt the main ignition circuit in a way that cuts the engine while running — this would create a risk of rear wheel lock-up. Use only a starter cut-off.
Luggage Racks, Saddlebags, and Windshields
Luggage Racks
Rear luggage racks have a rated capacity of 5 to 10 kg. Engine guards (crash bars) are not designed to support weight — they are only for protection in the event of a fall.
Mounting Points: Use the original mounting points (frame bolts). Never drill into the frame — this compromises its structural integrity and voids the warranty.
Torque: Mounting bolts must be tightened to the manufacturer's specified torque (typically 20 to 30 N·m for M8 bolts). Use thread-locking compound (blue Loctite 242) on all bolts exposed to vibration.
Windshields
The windshield modifies aerodynamics and can cause:
Steering flutter at high speed (instability) — the center of pressure shifts.
Turbulence at helmet level — increased noise, rider fatigue.
Engine overheating — by reducing airflow over the cylinders (especially on air-cooled motorcycles).
Adjustment: The top edge of the windshield should be at the rider's chin level (clear line of sight). A windshield that is too tall creates reflections and reduces visibility.
Canadian Standards and Certifications
Applicable Standards
Canadian Electrical Code, Part I (C22.2): Electrical installation of road vehicles — rules 5-102, 8-200, 12-100, 14-100.
CSA B149.1: Natural gas and propane code — applicable if the motorcycle is equipped with a propane heating system (rare, but exists for sidecars).
Canada Motor Vehicle Safety Standards (CMVSS): Article 138 (TPMS), article 108 (lighting).
Motor Vehicle Tire Safety Regulations: DOT marking, load and speed index.
Additional Lighting
Additional lights (fog lights, auxiliary lights) must comply with article 108 of the CMVSS:
Mounting height: between 380 mm and 1,370 mm from the ground.
Color: white or amber at the front, red at the rear.
Power: must not dazzle other drivers (maximum intensity of 3,000 candela for low beams).
Control: must be independent of the high beams.
Summary
Load calculation: Use P = U × I and verify that the total accessory load does not exceed 80% of the alternator reserve (Rule 8-200 of the Canadian Electrical Code).
Circuit protection: Each accessory must have a fuse rated at 125% of the rated current (Rule 14-100).
Wire gauge: Choose according to current (18 AWG for 7 A, 14 AWG for 15 A, etc.).
Grounding: Resistance less than 0.1 Ω, solid connection to the frame.
Heated grips: Typical resistance of 4.8 to 7.2 Ω per grip, total current of 2.9 to 4.3 A.
TPMS: Torque of 4 to 6 N·m, frequency of 315 MHz (North America), mandatory on motorcycles over 400 cm³ since 2021.
Alarms: Standby consumption of 2 to 10 mA — check to avoid battery drain.
Safety: Always disconnect the battery before any electrical work, negative terminal first.
Compatibility: Check alternator capacity before installing high-consumption accessories (heating, audio).
Pitfalls to Avoid
171.Confusing RMS and peak power in audio — RMS is the true continuous output value, peak is 2 to 4 times higher. Load calculations must use RMS.
172.Forgetting the 80% rule — a circuit loaded to 100% of its rated capacity overheats. Rule 8-200 requires a 20% margin.
173.Using a fuse that is too large — a 15 A fuse on an 18 AWG wire (7 A max) does not protect the wire. The wire melts before the fuse blows.
174.Neglecting voltage drop — in a 3 m accessory circuit with 18 AWG wire (resistance of 0.021 Ω/m), the voltage drop at 5 A is ΔU = 2 × 3 m × 0.021 Ω/m × 5 A = 0.63 V. At 12 V, this represents a 5% loss — acceptable, but beyond 3% for lighting, a larger wire is needed.
175.Over-tightening the TPMS sensor — the torque is 4 to 6 N·m. Exceeding 8 N·m cracks the plastic sensor body.
176.Connecting an accessory directly to the battery without a fuse — a short circuit can cause a fire. Always install a fuse within 15 cm of the positive terminal.
177.Ignoring electromagnetic compatibility — a GPS power cable routed parallel to spark plug wires causes interference. Maintain a 15 cm distance.
178.Forgetting the service loop at the steering head — heated grip wires must have slack to prevent breakage during full lock turns.
179.Confusing TPMS frequencies — 315 MHz for North America, 433 MHz for Europe. A European sensor will not work with a North American receiver.
180.Not checking the alarm's standby consumption — an alarm drawing 50 mA discharges a 12 Ah battery in 10 days. Always check the quiescent current after installation (must be < 10 mA).
181.Drilling into the frame to install a luggage rack — this structurally weakens the frame and voids the warranty. Use only the original mounting points.
182.Forgetting the N·m / lb-ft conversion — torque wrenches may be calibrated in both units. 1 N·m = 0.7376 lb-ft, 1 lb-ft = 1.3558 N·m.
