912is won't run with "start power" off

Bill

I've got a wiring diagram, but it's pretty much from the Install Manual. All the stuff is at home, let me get it out and post it. 

Thanks, I appreciate your help. 

Jack

The devil is in the details.
The difference between "Pretty Much" and "Exactly Like" will be the important part.
There is also the difference between what you Intended to build and what was actually built.
We know there is something wrong.
We need to find it problem and not get into finger-pointing.

When building a plane, you need to have the attitude that you are going to make two mistakes for everything you get right on the first try.

Bill

I hear you loud and clear. I wired up the full G3X panel with autopilot myself and made plenty of mistakes. It's likely that I did something wrong wiring the 912IS. I'm happy that it all seems to work (present problem excepted), fuel pumps turn on, lanes turn on, engine instruments all work over the CANBUS on the G3X, it started right up. I think I've got all the switches correct, but I certainly could have a ground landed incorrectly. I don't foresee any fingerpointing. 

I'd really like to run it again and do some more testing. But, I've removed the prop and given it back (it was a loaner from a friend). My intention was not to start it up again until it was nearly ready to fly. But I may go ahead and buy the prop so that I can run it some more here at the shop and figure this out before I move the whole project to the airport. 

Jack

When you run it again, try to determine why it is shutting down.

If the Fuel pumps lose power, the engine dies soon after, but not instantly, with the Lanes still alive.
The Lanes usually flash for a Tenth-Second as power is removed, so if the Revs are in the medium range, the lanes should stay alive at least 'till the RPMs wind down below 1000.

Rev it up to ~3000 rpm and then kill the Start power.
If the Lanes Flash and the engine dies immediately, They lost power first.
If the engine runs for another half-second after Start power is removed and the Lanes don't Flash until the very last, The Pumps died first.

I can't believe it's been 7 months since I first started the engine and noted this problem. I would have thought the plane would be done by now. Nevertheless, that's where the project is. 

I started the engine again this weekend and ran it a little longer. Confirmed that the engine will not run without either the Start Power or Emergency Power switch on. It dies as soon as you turn off both of those switches. 

I'm planning on running it again tonight and have a friend coming over to listen to the fuel pumps. Hopefully, we can determine whether the Lanes or the fuel pumps are turning off and killing the engine. Will also be watching the lane lights to see how they behave as the engine shuts down. 

I've been back over the wiring and I can't see any obvious mistakes. 

I'll update tomorrow and report what we found. 

Jack