MSefi.com read only forum (Jan.15,2018)

Am I missing something obvious here? MS Ver. 357 with realay board. Wired it up, starts, runs, but won't shut off unless I disconnect the fuel pump - then it dies a relatively slow death. Once it dies there is no power to the relay board. Checked both constant 12v and switched 12v - works fine. Am I getting feedback from the alternator maybe?
Thanks,
Paul

That's possible. It looks like something is still feeding you power on the 12 volt switched wire. Make sure it is losing power when you turn the ignition key off.

Thanks Matt,
I can verify that the switched 12v has no power with ign. switch off engine not running. If I start the engine, turn ign. switch off (engine still running) and then check the switched 12v with a test light - as soon as the test light touches the 12v switched connection on the relay board - the engine shuts down. So I cannot verify power there while switched off and running. I can at least shut the engine off (at least until I mount the relay board out of the way! Any ideas how to trace this?
Thanks again,
Paul

I have found that if I start the engine and do not rev it up enough to kick in the regulator so that the alternator charges, I can then shut the engine off normally. Once the alternator kicks in, the engine will not shut off. The problem is that I have tried several locations even directly on the ignition switch for the switched 12v and they are all the same. For whatever the reason the alternator is feeding back into this circuit, the feedback is present everywhere on the switched 12v side. I am not an electronics guy so, the question is - is there a circuit I can assemble leading to the 12v switched supply lead that I can assemble that will solve this?
Thanks,
Paul

Figured it out. I had used one of the connections on the relay board for providing 12v supply to the injectors for the power to the EDIS module. Changed that to switched 12v and that did it!
Paul