390 EC Front A/C Problem

Express 390

Well-Known Member
Sep 14, 2018
661
South Shore of Long Island NY
Boat Info
1986 SeaRay 390 EC
1993 SeaRay 290 DA single 7.4 /Bravo 2
1992 SeaRay 230 DA 4.3LX Alfa drive
Engines
Twin 454 Crusaders inboards 4 blades
A friend of mine with with a 1988 SeaRay390 EC is having a problem with the front A/C I'm not getting any power to the Compressor but the fan runs its a tuff unit to work on I'm thinking maybe a relay but can't find it, or a start capacitor. Am i warm and on the right track?
 
Move this to the Classic forum or more specifically the 390EC page and you will likely have better response than here.

Any time the system is "on" at the rheostat dial, the fan is on. If either unit is calling for heat/cool, the pump is on. There is a small board on top of the A/C unit that has all of the electrical connections on it under a sheet metal guard, that is where you will need to start your diagnosis of the problem. There is an old manual online somewhere (can't remember where and I didn't save it) that shows the wiring schematic for this unit. Start with that.

Good luck.
 
Move this to the Classic forum or more specifically the 390EC page and you will likely have better response than here.

Any time the system is "on" at the rheostat dial, the fan is on. If either unit is calling for heat/cool, the pump is on. There is a small board on top of the A/C unit that has all of the electrical connections on it under a sheet metal guard, that is where you will need to start your diagnosis of the problem. There is an old manual online somewhere (can't remember where and I didn't save it) that shows the wiring schematic for this unit. Start with that.

Good luck.
Thanks so much!
 

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