Powering up the electrical circuits on my 54'180 after complete refurb ...
All new wiring and instrument panel.
Not sure about the stall warning system ... With the circuit breaker in, the horn blares continuously and moving the stall warning vane has no effect.
Suggestions welcome ...
Thanks

The stall warning system uses a ground completion circuit. The stall warning vane (switch) has one side to ground and the other to the horn. Power is supplied to the horn. If you remove the wire which goes from the warning vane (switch) to the horn and the horn silences then the problem is with the switch. If the horn continues to sound then the problem is a short to ground of the wire going to the horn. If there is a connection at the wing root you could disconnect the wire there to narrow the search. I hope this helps.

Tim

As suggested... the stall horn is hooked up backwards.

I've had the exact issue pop up a few times on my '54 and have cured it with a very careful disassembly and cleaning. Replacement is some insane amount. little spiders seem to like the pricey real estate. Maybe spider poop is conductive, dunno.

Just to clarify, the disassembly and cleaning was not either the airplane or the spiders but was the stall switch.

It's possible that the wire from the horn to the stall vane got pinched and is shorted to ground. I would disconnect the wire from the horn to the vane first and see if the horn still sounds like previously stated. If it is silent then I would hook an ohm meter to the wire and see if it open or closed with the other end at the vane disconnected. Also a poorly crimped wire can allow a wire strand to contact the housing of the horn or vane and cause a short.

54c180 wrote:... the stall warning system ... With the circuit breaker in, the horn blares continuously and moving the stall warning vane has no effect. Suggestions welcome ...Thanks

Pull the breaker? (sorry, couldn't resist! )
As a side note, it sounds like you have the stall horn circuit on a pullable breaker?
With my 53 model, the stall horn circuit is wired from an "auto-reset" breaker which is mounted behind the panel-- in my case, adjacent to the starter button on the far left end of the row of breakers. Apparently Cessna didn't want pilots to be able to easily disable the stall warning. BTW the turn-and-bank is powered off that same breaker.

Thanks for the input everyone ... Working fine now, I look forward to the test flight.
The ground was on the wrong terminal at the stall switch.
Yes, lots of resettable circuit breakers now, completely rewired, each circuit / electric component has a breaker. Must be 25 in 2 rows and the new panel fits fine.
Slowly but surely, the end of this refurb project is in sight ...