Though the Relay/Power Board is not required, it is a convenience and can reduce the chance of miswiring during the installation. The relay board povides a central place for all of the required relays, fuse protection, and external wiring for the MegaSquirt ECU. If you are installing MegaSquirt in a previously fuel injected engine you may be able to reuse all of your existing relays. If you are fuel injecting a previously carbureted engine you will need to install relays for the main ECU power, Fuel Pump, and FIdle circuit. You can do this manually or you can use the Relay Board to simplify this process.
Comes with DB-37 connector to be used to build your relay cable, and the “half-case” shown in the picture. The parts on the relay board are capable of standing up to an under hood environment.
Uses standard ‘mini-ATO’ style fuses. (not included) Recommended fuse values:
20 Amp main fuse
10 Amp fuel pump fuse
5 Amp fuses for INJ1 and INJ2 with a 4 cylinder engine, 7.5 Amps with an 8 cylinder.
You may need to change these values based on your needs. These are good starting values.
Make sure to check out our Relay Cable for connecting the Relay Board to your MegaSquirt ECU, and our Wire Bundlewhich comes in handy for wiring up all of the sensors/injectors/etc to the Relay Board.