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For those following this thread, an update: Several emails have been exchanged between Pete, Joe and myself. I've finished a circuit board layout (see attached image; dimensions in inches), which I' ...

After thinking about it, one could accomplish the same thing without installing a momentary push button switch by pulling the circuit breaker for the fuel level switches and then resetting it, assumin ...

The HPFS can stay open in Auto. It just needs to be closed in the off position.
In that case, Joe's schematic has you covered. His design should be easy to wire "in the air" using a chassi ...

I haven't gotten back to working on this but I wanted to check progress here. It looks like Joe has the basic switching schematic pretty much licked. Except...

As drawn, the HPFS is only under ma ...

Joe: Yep, I was over-thinking it. Well done. Your second diagram does exactly what's needed with nothing but one relay per side. You have to wonder why they used a PLC in the first place.

Pete: ...

Pete, do you have a datasheet link for your LPFS and HPFS? I'd like to see their electrical requirements and what position feedback, if any, they offer.

Yes, latching relays could definitely be pa ...

Here's a quick conceptual doodle showing how the switch wiring might be done to handle OFF-MANUAL-AUTO switching, using a 2TL1-1 (or, for a much cheaper alternative, the B&C S700-2-1).

Switched ...

OK, the 2TL1-1 is a standard DPDT ON-OFF-ON switch.

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You're not kidding about the wiring harness documents being cryptic! They'll take some effort to figure out.

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It looks like ...

Joe, that looks like what I had in my head after this discussion.

For those following along, the Honeywell 2TL1-10 (MS27407-4) is a DPDT ON-ON-ON switch. See the attached screen-grab from the data ...

OK, great.

Regarding the switches, I'm assuming they're SPDT toggles; if not, what are they? Can you describe how they're wired? Are all three terminals connected to the PLC, or is the common (mi ...

A few more questions:

1. With a vented main tank, can we assume that even in MANUAL mode, the Main Tank High Level sensor should close the LPFSs to prevent main tank over-filling and fuel loss via ...

In the original post, the device in question was described as a 'continuous' solenoid.

Is that relevant, or am I just being pedantic?
The primary difference between continuous and intermittent dut ...

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Aaah, OK. That makes sense now; thanks. I'm glad you found a definite cause for the problem and got it solved!

...the engine monitor is not receiving GPS data and the ELT gps reception test does not indicate data in (led connected to test lead).
I've been silently following this since you've been getting gre ...

I don't know if these will be helpful, but I was able to find a couple of documents related to this regulator or units like it.

First is a Textron Aviation service bulletin, SEB-24-06. It doesn't ...

I have several prototypes for recent projects on my bench that are excess to requirements. I'm offering them to anyone who wants one. Prices reflect my cost for circuit boards and components (no lab ...

This project is a low voltage warning module based on Mr. Nuckolls' AEC 9005-110-X schematic, which he proposed in 2002 (attached below). This circuit monitors the connected bus voltage and flashes a ...

I just uploaded a revised copy of the documentation for this project (now attached to the original post, above).

There was an error in the values specified for resistors R3 and R5. R3 should be 1. ...

Many aircraft builders have the skills and smarts to install an AOA Limiter system in their homebuilt aircraft. We need an electronics guru to design the circuit and program the microcontroller. Eri ...