Quote:
Originally Posted by PopsRacer
in case someone lands here with a no-start issue - the relay pin numbering is from the DIN_72552 standard (there is a wikipedia page about it too). Here is your pin-out:
30 - is + from battery directly
85 - relay coil -
86 - relay coil + (important if there is a flyback diode across it)
87 - common contact for switch
87a - normally closed contact
87b - normally open contact
The DME relay does have a diode in it btw. I needed to replace the one in my DME relay. It’s a 1N4003 (200V rated) but you can use any 1N4xxx that is rated the same or higher. It’s just there to suppress flyback from the coil.
If you want to test your diode without opening up the relay you can use the diode testing setting on you DMM easily. Clip the black lead to pin 85 and the red lead to pin 86. You should read the .548V bias. Reversing the leads should give you OL (out of range). If you get OL either way, you need to replace the diode.
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Joe, the pinout you mention above is correct for SPDT standard relays (with the exception that on most automotive relays the 87b pin is actually labelled 87 with no "b").
However the DME relay is different. It has a 85b (not 87b) pin and two SPST switches inside.
I don't understand the purpose of the 680-ohm resistor connected in // with the first coil. Any idea?