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MegaSquirt Relay Board - UnAssembled Kit

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MegaSquirt Relay Board - UnAssembled Kit

MegaSquirt Relay Board - UnAssembled Kit Part # MSRelay-K - Now with black anodized case to match the rest of our lineup!

Includes everything you will need to build your MegaSquirt Relay Board.

Though the Relay/Power Board is not required, it is a convenience and reduces the chance of miswiring during the installation. The relay board provides 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 a "half-case" setup that serves as an enclosure and mounting bracket. The top of the relay board is exposed when the board is complete, but all the components are safe to install in an engine compartment.

Uses standard 'mini-ATO' style fuses. (not included) Recommended fuse values (from the MegaManual)

  • 20 Amp main fuse,
  • 10 Amp fuel pump fuse,
  • 5 Amps 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 Bundle which comes in handy for wiring up all of the sensors/injectors/etc to the Relay Board.


For a tech/how-to video for installing your MegaSquirt Relay Cable into your car, check out our Tech & How-To Videos Page here.

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by Rod Rawlings Date Added: Wednesday 02 September, 2009
I should not have to tell you that the more protection one builds into a MSECU system the less one has to worry about with errant voltage spikes hitting the ECU board - doesn't matter if you're using the MS-I or MS-II and the multitude of circuit board versions and software available to the system. Go for it - it is a lot cheaper than the equivalent Painless Wiring relay control system...

Rating: 5 of 5 Stars [5 of 5 Stars]

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