Relays have been used extensively in automobiles for many years. The main usage of relays in an automotive application is to control a high amperage component, such as a fuel pump or electric fans, with a low amperage circuit or switch, such as a fuel pump grounding circuit on an ECM.
There are several benefits of using relays in an automotive application. First, as stated earlier, you can turn on a high current component, such as an electric cooling fan that draws 70 amps of DC current, with a switch that has a much lower amperage rating or even an ECM with a circuit that simply provides a ground to turn the fan on and off. Another benefit of using a relay in your project is that the high amperage component is connected directly to the battery using a larger gauge wire, allowing the high amperage component to operate at full capacity.
A good example of this benefit can be seen when using a relay in a halogen headlight circuit. A halogen headlight operated with a relay will be considerably brighter than one that has to rely on its power passing thru a headlight switch and the 14ga. headlight wires that are used in most chassis harnesses. The final benefit of using a relay that we will discuss is circuit isolation. If you use an ECM to control a relay the relay isolates the ECM from any voltage spikes or feedback issues created by the high amperage component, helping to protect the sensitive semiconductors found inside the ECM.
Electric Water Pump Relay Kit
This electric water pump relay kit provides maximum battery voltage to maximize cooling efficiency and to protect the main electrical system from damaging amperage overloads.
Weatherproof ElectricWater Pump Relay Kit
Perfect for the harsh conditions encountered off-road, this electric water pump relay kit provides complete protection from the elements and ensure reliable and dependable performance. These kits utilize heavy duty waterproof relays, weatherproof circuit breaker covers and extreme condition weatherproof shrinkable crimp-on terminals.
Universal Fuel Pump Relay Kit
A relay will prevent voltage drops at the fuel pump thus maintaining constant fuel pump pressure, and will prevent fuel pump amperage from damaging the electrical system. It’s a good idea to relay your fuel pump for the street and a must when you’re racing.
Weatherproof Universal Fuel Pump Relay Kit
Perfect for the harsh conditions encountered off-road, this fuel pump relay kit provides complete protection from the elements and ensures reliable and dependable performance. These kits utilize heavy duty waterproof relays, weatherproof circuit breaker covers and extreme condition weatherproof shrinkable crimp-on terminals.
Roll Over Safety Switch Kit
Automatically shuts off power to fuel pump in the event of a vehicle rollover. Recommended by many racing classes. Not recommended for off-road use.
Manifold Heater Relay
The job of the manifold heater is to help vaporize fuel in the intake manifold when the engine is cold. This will help with cold starts and idling until the engine is up to operating temperature. This kit allows a manifold heater to be used if you are rewiring your Jeep using a Painless chassis harness, using a later style manifold on an older Jeep, or if the factory relay was cut from your Jeep at some point in time by you or a previous owner.