A relay center that pre-wires all the relays in a single unit. Dedenbear Multiple Relay Center units allow you to pre-wire all the relays in a single unit. Basically each stage has a signal wire going in and a power wire going out. The inputs and outputs have indicator LEDs for easy trouble shooting. All of the wiring mess is replaced with one simple compact relay center for the utmost in reliability. These units are so versatile, that they can be used to power anything in a car that needs high power levels, not just nitrous systems. Use for high powered Nitrous solenoids or other high power devices such as fuel pumps, water pumps, throttle stops, fans, etc. Four relays pre-wired and ganged together to power up to four stages of NOS solenoids One separate relay with inputs and outputs completely isolated to allow wiring in any configuration. Relay inputs can be "negative" or "positive". Relay outputs can be "negative" or "positive". Indicator LEDs for relay coils and outputs make troubleshooting a snap. Easy access replaceable fuses for each relay. Incredibly simplifies wiring and improves reliability.