Rider Comfort, Accessories, and Bodywork
Domain focus
This domain covers electrical accessories, heated grips, luggage, wind management, seats, body panels, and cosmetic repair. The exam tests electrical load planning, safe mounting, and avoiding damage to bodywork and control systems.
Core rules
- Calculate accessory load against alternator output. At 14 V, watts divided by 14 gives amperes. Subtract the motorcycle's baseline draw from total output to find available capacity, and leave margin for charging.
- Install accessories through a relay triggered by the ignition and a fuse at the battery. Do not tap headlight or CAN bus wiring for high-current loads.
- Use the correct wire gauge and sealed connectors. A poor ground can cause dim lights, noise, and ghost faults.
- Mount luggage and windshields within the manufacturer's load limits. Keep access to oil coolers, radiators, exhaust, and suspension clear.
- Body panels use specific clips, grommets, and fasteners. Use hand tools on plastic threads and torque small fasteners lightly.
- Heated grips must fit the bar diameter and be secured without interfering with the throttle. Check that the throttle returns freely after installation.
- Paint and plastic repair require matching substrate and flexible additives; test on a hidden area first.
Worked example
A motorcycle has a 300 W alternator and a baseline draw of about 180 W, leaving 120 W. The rider wants heated grips at 36 W, auxiliary lights at 40 W, and a phone charger at 10 W: 86 W total, leaving 34 W margin. The technician installs a relay triggered by the ignition, fuses the main feed at the battery, uses 14 AWG wire for the combined load, and grounds the accessories to a clean frame point. The lights are aimed and checked for glare. At idle the charging system may not keep up, so the rider is told to avoid running all accessories at low rpm.
Traps
Tapping CAN bus wiring; fitting a fuse larger than the wire can carry; omitting a relay; using a poor ground; blocking an oil cooler or radiator; fitting a bulb that melts the housing; exceeding luggage load limits; and forcing plastic clips or cross-threading body fasteners.