So I'm trying to design a circuit for a situation with the following scenario:
SW1 is representing a cut wire after the access box. I can't tap into anywhere except the access box shown in the picture and I can T in (preferred) or cut into the supply and/or ground lines. I have found one way where I can use a current sensor but that would only solve half the problem. If SW2 is open(chip is good)/closed(chip is bad) and would give false positives if SW1 is open(wire cut). So the problem is needing to accurately detect if it's 27.119V open, open with fault, shorted with fault, shorted.
I've been looking all over and found some similar situations but all had more access than I have. I have found a circuit for doing a time domain reflectometer as a last resort but hoping it can be simpler than that. Thank you for any help.
To reiterate: for the circuit I need to make it can only affect what's in the square "access box". It's for a senior design project for school and the rest of the circuit shown is a closed system and the red SW1 is a hypothetical we need to be able to test for (wire gets cut/contact in a connector comes loose/etc).
If it helps with the design: from the access box to the chip sensor it's roughly 10' of wire.
After doing a little more research and with regard to the comments this is a little better representation and now simulatable (I didn't know about the schematic button in the text editor previously... The previous one I made was requiring me to pay for a subscription to share because I made it on their site first so I just screenshot it instead)