Z32 Blue & Green Relays; whats the difference?

Discussion in 'Technical' started by ivan129, Dec 3, 2023.

  1. ivan129

    ivan129 Active Member

    The Blue & Green relays used in the engine bay fuse box have the same pinout, same coil impedance (about 76 Ohms) and same contact pin configuration (make contact). So; can anyone tell me what the difference is between the 2. Does one have a higher current rating for the contacts? If so, what's what? Thanks
  2. ivan129

    ivan129 Active Member

    Forgot to add.. I have browsed through the manual; couldn't find any reference that described the difference; and google doesn't seem to know either.
  3. NI85

    NI85 Active Member

    Assumption: may just be helpful to distinguish between circuits. Interestingly the Green ones seem to point to engine running circuits: EGI, Fuel pump, Ign coil
  4. ivan129

    ivan129 Active Member

    Did some electical comparisons and then disected them to see inside.
    Both relays have the same pin configuration and numbering
    Both relays have a coil resistance of ~ 80 Ohms. Pins 1 & 2
    Both relays have 1 x Make contact @ pins 3 & 5
    Both relays have a internal 1K resistor accross their coils. This changes the operate and release characteristis of the relay.
    Green relay operates at ~5.0V, Blue relay operates at ~ 6.3V (tends to suggest Blue relay has heavier internal contacts)
    Green relay releases at ~2.0V, Blue relay releases at ~ 2.6V
    Upon inspection of the internals, It does look like the Blue relay has bigger contact and would probably handle higher current than the Green relay.
    In summary: I would suggest that using a Blue relay in place of a Green relay is ok. I do; and the wheels haven't fallen off yet.
    NI85, ADAMZX and ryzan like this.
  5. ryzan

    ryzan Moderator Staff Member

    Great analysis, thanks for posting!

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