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The relay I drew the circuit for (not sure whether yours is the same or not) needs about 50V on pin 1 to trigger it. The 39K and 470R resistors in the bottom left of the diagram reduce this to approxi ...

I was able to scope the signal with the msd installed and stock ECU piggybacked so I could see the signal with the car actually running, and it looks like pin 1 does receive 50 volts! So it looks lik ...

Actually relay needs only (+12V) signal to be trigged - from coil to input 1 in relay.
The relay I drew the circuit for (not sure whether yours is the same or not) needs about 50V on pin 1 to trigger ...

Yes I understand, I have MSD ignition control, not msd coil, the msd ecu doesnt need the starter activation to coil during cranking... Right now I'm trying to figure out what tells the ECU to power th ...

it is indeed a US car.

I was originally lead to believe that the fuel pump relay would power down if the ECU didnt see engine rpm. More digging has lead me to believe the circuitry in the relay is ...

I found i didnt have the green and white connected when looking at the scope... now I see the 12v signal with key on at pin 1 and 15...
I thought the 12v signal was only supposed to be present if the ...

dredging up an old thread here: if all the fuel pump relay is doing is reading the coil switching, why doesnt it work with MSD ignition? even thou the tach reads the signal fine? is there a resistor i ...