HEI Troubleshooting Page 2 coil in capSecondary Ignition Wiring Diagram Pickup - Nissan 240sx performance, modifications, maintenance, repair, diagnostic and how-to articles. S&S Cycle manufactures several engine components for Buells. This includes everything from cases to heads and flywheels. The most interesting product for Buells is a 100 cubic inch long block.. In the above-left image, the connections of the wires to the back of the deck light socket is shown. With LED lights, polarity matters, the R-B wire is +12V and the W-B wire is ground..