Automotive Wiring 1. Basic Tips, Tricks & Tools for Wiring Your Vehicle. Cars are filled with stuff that can make or break performance. The engine needs to be fed the proper amounts of air, fuel, and spark. The suspension and brakes must be in tip- top shape. The wheels and tires, transmission, cooling system, gauges—even the seats—must all function properly. With all those things to worry about, many enthusiasts overlook the electrical wiring system.
A lousy wiring job will keep your electrical accessories from operating at full potential—and that means subpar performance. Many people are intimidated by the prospect of wiring a vehicle. But a proper wiring job doesn’t have to be a scary task—we’ve put together a few tips to help make the job a little bit smoother. Round Up The Right Tools. The proper tools will make your wiring job a whole lot easier. Start with a quality set of wire strippers. Panduit wiring duct is the premium wire and cable management product for routing and concealing electrical wiring in control panels. Available in many sizes, colors and materials and all made with Panduit six sigma quality. Here is a classic wiring mod to a Les Paul that provides that signature Jimmy Page sound. All four control pots are push/pull control pots. They act as both volume/tone pots and switches. When all four switches are pushed in. Wire strippers generally include a group of holes to fit most wire gauges. This allows you to strip the insulation off your wires without accidentally cutting into the wire conductors. A good wire crimper is necessary when you install solderless connectors. Most quality crimpers have two or three sections on the nose to fit various lug sizes. You can even get crimpers with wire cutting and wire stripping sections. A soldering iron is a must for splicing wires or securing oversized connectors that cannot be crimped. You will need solder designed specifically for electronics and wiring . It has a midly activated rosin core flux to clean the wire as it is being heated, removing oxidation and light corrosion. That allows you to solder with less heat, making the connections stronger with less electrical resistance. Here are some other items that should be in your electrical toolbox: A wire brush for removing heavy corrosion, oil, or grease before soldering. A volt/ohm meter to measure voltage and resistance levels in your circuits. A test light to test for power within a circuit. Shrink tubing to insulate connections from outside elements. The tubing slides over the connector or solder joint and permanently shrinks when heated. Gauge Your Wiring Needs A factory wiring harness includes the necessary wiring for standard electrical components like windshield wipers, horn, headlights, etc. However, when you add electrical or electronic components to your vehicle, like high- end audio or racing electronics, you need to choose the proper wire on your own. There are three factors to consider: size, material, and color. Wire size is measured by gauge—the smaller the gauge number, the larger the wire. The gauge you need depends on the current draw of the accessory and the wire length between the accessory and the power source. In general, the larger the current draw, the larger gauge wire you need to properly power the accessory. One factor to consider with long lengths of wire is voltage drop. The longer the wire, the greater the voltage drop. You can offset voltage drop by increasing the size of the wire. As a rule of thumb, try to maintain a less than . Wire material is usually aluminum or copper. For automotive purposes, we recommend stranded copper wire for the greatest flexibility and conductivity. Wire color may not seem important at first glance, but it becomes crucial when you try to trace a faulty circuit down the road. To keep yourself from tearing your hair out, color- code your wire by accessory. It will help you keep track of which wire goes where during installation and troubleshooting. Make the Connection. There are two main types of connectors: soldered and solderless. Soldered connectors are necessary with oversized wiring or if you’re splicing wires together. Solderess, or crimp, connectors can be used for most other wiring, and we’d recommend using them wherever possible. Solderless connectors are the easiest to use and provide a good, strong connection. Usually, solderless connectors come with color- coded insulators, so you know which gauge wire they are designed for. Solderless connectors come in a variety of configurations: Butt connectorsare shaped like cylinders and are ideal for joining two wire ends together. A wire end is inserted into each end of the connector, which is crimped to complete the connection. Spade connectorsare ideal for components that are removed or serviced often. A male connector on one end of the wire fits into a female connector on the other end of the wire, completing the connection. To disconnect, just pull the connectors apart. Ring connectors are used to secure wire to screw- type terminals; they are secured by the terminal screw. When installing any type of connector—soldered or solderless—it is a good idea to use shrink tubing. Shrink tubing is relatively easy to install and provides added protection against electrical shorts and outside elements. Choose the Right Components. There is more to wiring a vehicle than, well, wire. For example, you will need some sort of overload protection to protect your expensive electronics. The three basic types of overload protection are fuses, fusible links, and circuit breakers: Fusesare designed to blow when the circuits they protect are fed more power than the fuses are rated for. Fuses are rated by amperage; popular sizes are 3, 4, 5, 6, 7. Always use a fuse rated slightly higher than the accessory. For example, if an electric fan is rated at 1. Fusible links are another option. They are special wires made from an alloy with a lower melting point than regular copper wire. The link is spliced inline with an accessory’s power wire. In the event of an electrical overload the link will melt, preventing power from reaching the protected accessory. Acircuit breaker will switch off power to the protected accessory in an overload situation. When the overload has been corrected, the circuit breaker is reset. Circuit breakers come in manual reset and automatic reset versions, and in the same popular amperage ratings as fuses. You should also install relays with your wiring if your electrical accessories require a bigger current draw than a standard power switch is rated to handle. And since most switches are designed to work with very limited currents, relays are required just about every time to wire a new aftermarket electrical accessory. Relaysare extremely useful for handling high- amperage electrical accessories like large electric fans, fuel pumps, and HID headlights. They are activated by an electric coil and controlled by a switch. When the relay is closed, no power goes to the accessory in question. When you flip the accessory switch, an electric coil in the relay opens, sending power to the accessory. There are plenty of other products to make your wiring tasks easier, including switch panels, multi- circuit main and auxiliary fuse blocks, toggle, push- button, and remote- mount switches, and of course, wiring harnesses for everything from fog lights and gauges to complete vehicles. Map Out a Plan. Before you begin your wiring project, map out a plan. Lay out the wiring or wiring harness so you know where each wire goes and that you have enough wire to complete the job. Locate the fuse box in an easy to reach location like your glove compartment or center console. Place the necessary relays, fusible link, or circuit breakers at connections between your power source and your electrical accessory. If the wiring isn’t labeled already, label each wire or harness with the name of the components they route to. If the wiring or harness will be going through the firewall, use a grommet in the hole so the sheetmetal won’t cut through the wires. Don’t secure the connectors until the wiring is through the firewall. Choose a spot on or near the firewall for the common ground point for the harness, and one point for a chassis ground on the negative side of the vehicle. This method gives you a single path to the negative side of the vehicle and provides a more effective ground. Use 1. 0 gauge or bigger wire to connect the common ground to your chassis ground. Take your time, stay organized, remain calm, and you’ll be a wiring wizard before you know it!
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October 2017
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