V8 Miata Wiring, Electrical, and ECUs v8 conversions on a Miata can be tricky. Post your comments or questions within with regards to swap wiring and electrical.

McCully Ford Conversion Harness Relay Specs

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Old 04-23-2020, 06:52 AM
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Default McCully Ford Conversion Harness Relay Specs

Hey guys, does anyone have the specs handy for all of the relays used in the McCully conversion harness? I got my harness 4 years ago and my tuner thinks that the ECU or fuel pump relays may be failing, since the ECU loses power during higher rpm pulls. My car is stored a good distance from where I live so I'd like to come armed with new relays next time I am out there, to see if that fixes the issue.

Thanks in advance!
Old 04-23-2020, 08:15 AM
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Send him an email and ask him. I would imagine that he used whatever was used on a 1990 Mustang. Those sould work unless he used the "jumper" method that Martin uses for the Miata fuel pump relay.
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