Automotive Electric Guide - Power To Play

Since current for an electrical device must flow equally in both the positive power wire and the negative ground cable, they both need to be sized to handle the anticipated current draw of the device. Also, ensure the ground is well connected to a clean body panel or frame bolt.

Connections
The auto environment is a harsh one. Temperature extremes are wide, and vibration and aging can also contribute to possible electrical problems. It pays to make electrical connections carefully and protect them from rubbing on metal edges and flopping around. Simple bundling with tie-wraps can help increase the reliability of your wiring. Clean, organized routing will also help keep your wiring decipherable and make any future troubleshooting easier.

A common cause of electrical problems associated with added electronics or accessories can be traced to poor connections. Even using the finest equipment and materials won't provide you with a successful install if you make unreliable wiring connections and fail to adequately protect them.

Resetting circuit breakers can also be used instead of fuses. These will simply go "open-circuit" when excessive current flows through one. It will thermally reset continuity once it cools down a minute or so.

Properly soldering wires provides the most secure connection when wiring auto electrics, but quality crimp connections can also provide reliable joints that can withstand heat, cold, vibration, and moisture. Any joined wire should be carefully stripped and attached to the crimp connector with the proper crimping tool for best results.

Exposed conductors should be covered with insulation. Shrinkwrap tubing is the best solution and often the toughest covering. Electrical tape can be used, but ensure that it cannot unwrap over time. Thoughtful routing of wiring will help keep the outer insulation from abrading and rubbing on metal surfaces. Grommets should be used where wiring is fed through metal panels to further protect from chafing and shorts.