737-300 tq trim cutoff, a/t disconn, togo switches help

[kurt-olsson]

I have stripped and moved the cables not needed and now i have to identify some buttons and switches.

My problem is that i have to know which cables are ground to be able to measure on the other cables to see if anything happens when pressed.

How do you go about to identify the cables when it looks like this?

[727737Nut]

Hi,
Ok, not to be rude or anything but the first thing you need to accomplish these goals are basic electronics knowledge, how to use a DVM, and how your interface works. 

There are no 'grounds' as you call it in a switch.  It is just a contact that is either made or not.   A simple dvm will tell you which wires are connected to which terminal by doing a continuity test. 

Which wire you hook to the 'gnd' side of your interface makes no difference except whether it is considered normally open or normally closed switch.   

This is all very basic stuff that you need to know first before taking on a project like this.  I am glad to help as I have worked on a few TQ's in my time but I think it should be about how to remove a part or what parts work well for interfacing to the flightsim.   

By learning about the basics, it will give you a good foundation to use advice given to you by others.

Rob

[kurt-olsson]

Hi your not rude at all. Your post kind of solved "the last puzzle" i messed up with thinking of the "dedicated ground" but it is actually just to check for the connected circuit depending on the state of the buttons. My volmeter is ready to go!

My skills are not very good, but this is the first OEM part for me and this will be the most advanced electrical wise. Other panels and electric components you buy are easier to work with.

Think i can sort this out now.

By the way, going 737-200 way with your analog gauges is another level that reauires skills!

[727737Nut]

Glad you see it for what was intended and thank you for the kind words. 

Rob

[kurt-olsson]

Talk about nailing it Rob!!! After your explanation everything is crystal clear.
Cables cut and identified!

The other switches should be no problem as well!

[727737Nut]

Great job!!