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Posted: **Wed Apr 15, 2015 12:43 pm**

MX-5 B5B4 & B577 Relays.jpg

MX-5 B5B4 & B577 Relays 001.jpg

Is there any difference in the usage of these two relays. One is from NA the other NB

The pin configuration is the same & the plug fits to the same harness connector.

Posted: **Mon Apr 20, 2015 1:51 pm**

Probaly interchangeable, as some have successfully interchanged (so far) the NA Fuel Inj relay & NB EGI relay, but of course no guarantee.

Posted: **Wed Apr 29, 2015 1:19 pm**

Thanks for your helpful input 93_Clubman

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Relay B5B4 & B577

Relay B5B4 & B577

Re: Relay B5B4 & B577

Re: Relay B5B4 & B577