Locate the amp rating for the accessory you are going to install. As in the diagram a wire is run from a 12 volt power source to the switch in the cab and out to the relay placing a fuse at the source of the power.
Painless Wiring
How to wire accessories in car. Learn which wires power different accessories in this free video clip. The method i use for wiring the lights and other external accessories for the most part follows the diagram pictured above. There are a few types such as the scotchlok which are secured by clips. This can be used for led lights like ditch lights and light bars. This is the correct way to hardwire the item so it is safely and securely installed to last. This is the amperage the accessory is rated for and it is only safe to.
Locate the car fuse box which is normally behind the dashboard or inside the glove box. Robert has been a alarm technician and owner for 10 years. How to wire accessories to car fuse panels. I used 3 out of 4 of my switches for driver ditch light passenger ditch light. A good wire crimper is necessary when you install solderless connectors. Use a 25 65 watt iron for most work and a 150 250 watt one for large cables or an 8 oz 225 g gas heated iron.
For additional security you can add solder to the wire. Wire strippers generally include a group of holes to fit most wire gauges. Start with a quality set of wire strippers. Nearly all types of terminals should be fitted to the wire with crimping pliers. This allows you to strip the insulation off your wires without accidentally cutting into the wire conductors. Here is exactly how i wire all of my accessories.
How to hardwire any 12 volt car accessory without using your cigarette plug port in your car.