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Its gonna be hard for me to explain this, so bare with me.
#1 & 2 are for the Coil that will close the contacts when energized (ECU will Energize this)
#3 & 5 are the contacts that will close when the coil is energized (battery power flows through)
the ECU will energize the relay coil & Power will flow through 3 & 5
from pin 104 to that relay you will only get one terminal with continuity, so that normal
What do you mean when you ground pin 3?
you mean one lead to Pin 3 and one to ground?
You should have
1 Nothing
2 12V
3 12V
5 0V
Almost sounds like your ECU is at fault
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 後輪駆動車1番
1989 Built SR GT2871R -363whp
1998 S14 W/RB25- 250ish (For Now)
1986 SR86 - 200ish
1990 R32 GTR - 320hp
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