Chapter 11: Electrical System Upgrades - Section Map
Chapter 11 is the electrical foundation for the rest of a high-performance mobile-audio system. It explains where voltage is won, where it is lost, and how to distinguish a wiring problem from a charging-capacity problem before random parts get added.
Chapter Sections
- 11.1 Alternator Selection and Sizing for charging capacity and average-current limits.
- 11.2 Battery Systems, AGM and Lithium for reserve strategy and chemistry tradeoffs.
- 11.3 The Big Three Upgrade for reducing path resistance and stabilizing the main current path.
- 11.4 Capacitor Banks and Ultracapacitors for transient support and storage misconceptions.
- 11.5 Wiring Infrastructure for High Power for conductor sizing, distribution, and protection.
- 11.6 Electrical System Troubleshooting for measurement-first diagnosis.
Suggested Reading Order
| If you are... | Start here | Main goal |
|---|---|---|
| New to electrical work | What It Is, then What Batteries Do | Build a correct mental model before changing parts. |
| Planning a build | 11.1, then 11.3 | Decide whether the real bottleneck is average supply or path resistance. |
| Troubleshooting an existing system | 11.6 | Use measurements to separate battery, alternator, wiring, and load faults. |
| Modeling or validating design choices | Ground Potential Rise and Three-Phase Rectification | Quantify the behavior instead of relying on rules of thumb. |
Fast Path By Problem
| If the problem is... | Read this first | Then read |
|---|---|---|
| Headlights dimming under bass | 11.1 Alternator Selection and Sizing | 11.3 The Big Three Upgrade |
| Vehicle dies after sitting | 11.2 Battery Systems, AGM and Lithium | 11.6 Electrical System Troubleshooting |
| Not sure whether a capacitor is worth it | 11.4 Capacitor Banks and Ultracapacitors | 11.5 Wiring Infrastructure for High Power |
| System resets at high volume | 11.3 The Big Three Upgrade | 11.6 Electrical System Troubleshooting |