AC Wiring Question/Issue

342guy

New to me Rinker 342. My AC is tripping the breaker at the panel. I took the panel out, tested the breaker for continuity and it was good (multimeter on each side of the breaker with it on). I opened the AC unit up to see where the wiring is coming in. There are two sets of white/black/green wiring coming into the unit. Tested the first set for continuity (black/white), no continuity. Tested the second set and continuity is fine. 

Does anyone know where the two sets of wiring run to? I assume one is from the breaker panel but dont know where the other comes from/runs to. Also there are two additional white wires going to or coming from the unit, maybe to the pump? 

I am no electrician but thought the lack of continuity between white/black on the one set of wires could be an issue? 

Stodge

Welcome aboard.  

I assume you have both main breakers on and power to both shore power inlets.

One possibility is the water pump.  The pump is located in the mid-berth, on the starboard side under the cushions.  Might be worth a look to make sure the raw water strainer is clean, the shut-off is open and the pump is engaging.

Only other thing that comes to mind is a wire that passes through the A/C housing getting frayed on the housing and shorting out.

There is LOTS of experience here and I'm sure some folks will chime in with other ideas.

Good luck and enjoy your 342.

Handymans342

The pump is 110v running from the AC unit. The other wire is the main 110v from panel. Its possible the pump is frozen causing the breaker to trip. Does it trip immediately or after a short period?

raybo3

Not really sure what "white and black" wire your checking and if its connected to anything but the black is power carrying wire and the white is the neutral. You should not have any continuity if its coming from a breaker that is turned off...... However you could be reading through the pump. Again not sure what set of wires your checking.

342guy

Is the smaller 20 amp breaker on the panel that is marked AC for the unit or the pump? It's the smaller one that pops. The fan comes on, I hear the pump start (should water be immediately coming out?), then something else tries to start and pops the breaker. 

Handymans342

Sounds like the compressor is locked up. Water should flow fairly fast. 

Handymans342

Could be a bad capacitor if it has one

342guy

I replaced the capacitor, no luck

Stodge

342guy said:

Is the smaller 20 amp breaker on the panel that is marked AC for the unit or the pump? It's the smaller one that pops. The fan comes on, I hear the pump start (should water be immediately coming out?), then something else tries to start and pops the breaker. 

It should take about 5-10 seconds from pump start till you hear it "peeing" outside.

Might watch the strainer for the pump and have someone turn it on and see if you notice any movement in the strainer (assuming it's clear like mine).