3/4 Full lights

[skinners1]

Our 3/4 full lights in all 4 heads remain on constantly. Has been this way since purchased 3 yrs ago. Removed bulbs to “fix”.Finally got motivated to chase the issue. Located pressure switch in forward Bilge area and as suspected it crumbled in my hands…. Replaced with a Groco AS100 but no change. Pressure line from tank appears to be intact and in good shape.Had to cut lines and add spades for the AS100 and lines were in acceptable shape no corrosion.. I am having a hard time tracking the lines out of the bilge. Where do these terminate and transfer to the heads, is there a buss bar or breaker I am missing?I do have an electronic sender/ gauge installed but would like for the lights to work for “nostalgic” reasons. I highly doubt that they would ever engage but my rule is “if it’s on the vessel it needs to work”

 

[Sadey]

Did you try blowing into the line to the tank to clear it? That fixed mine after I replaced the pressure switch.

 

[skinners1]

Did not “smacking my head” I’ll give that a shot however the lights are on even without anything connected to AS100, pressure tube nor electrical

 

[rwaldrop13]

Pau Hana's 3/4 full lights for the holding tank were always on. Prior to our ownership someone had anchored the stairs from the galley to the midships passageway, blocking access to the pressure transducer on the tank. When I put in new bulbs is when I discovered the issue, but between inability to access the mechanism, and trying to dissolve the solids in the tank, I never got around to it. I saw a post on here a couple of years ago where someone was able to access the mechanism and a shot of WD40 started it working again.