11-12-2025, 06:22 AM
Let’s break this down into digestible pieces and trouble shoot before you start disassembling the coach.
The first sanity check is to unplug the coach from the pedestal and crank the generator, not the main engine. If the 110 comp comes on, you do not have a wiring, fuse, or compressor issue. If it doesn’t, then you should start checking those items.
The reason your brake tank pressures remain up is that there is a check valve on both tanks that prevents brake pressure from leaking back and providing Supply Air.
The 12V compressor is plumbed differently on each coach. All of them supply the air powered Microphor.
Now if the generator runs the 110 compressor, then it is time to check your 30 to 50 adaptor as Jim said. The way it is supposed to work is that both legs of the 50 amp are tied together inside the adaptor and all circuits should be powered. However, you may have a home made device, and even a commercial device that only supplies one of the two legs of the 50. Easy way to check is to use the voltmeter on resistance. Check continuity between the hot 30 leg and both 50 amp legs. Google the plug arrangement to understand which leg is which.
And finally, the stove top is 240 volts, as is the high amp electrical element in the Aquahot. Both require 240 volts which is both legs of 50 amp, 180 degrees out of phase. You only have one phase anytime you are on 30, 20, or 15 amp service.
Oh yeah, one more thing. You have a misunderstanding about air brakes. The park brake comes on automatically when tank pressure is below 60 psi. The park brakes are great big springs, completely mechanical. When you release the park brake YELLOW button in the cockpit, you are actually supplying air to counteract the spring. It’s a failsafe design so that you cannot drive the coach without adequate air brake pressure because you cannot release the park brake without at least 60 psig of brake tank pressure. So, NO danger of you rolling away because your 110 compressor isn’t working.
http://www.newellowner.com/newell-air-system/ That will help you, and put you to sleep too.
The first sanity check is to unplug the coach from the pedestal and crank the generator, not the main engine. If the 110 comp comes on, you do not have a wiring, fuse, or compressor issue. If it doesn’t, then you should start checking those items.
The reason your brake tank pressures remain up is that there is a check valve on both tanks that prevents brake pressure from leaking back and providing Supply Air.
The 12V compressor is plumbed differently on each coach. All of them supply the air powered Microphor.
Now if the generator runs the 110 compressor, then it is time to check your 30 to 50 adaptor as Jim said. The way it is supposed to work is that both legs of the 50 amp are tied together inside the adaptor and all circuits should be powered. However, you may have a home made device, and even a commercial device that only supplies one of the two legs of the 50. Easy way to check is to use the voltmeter on resistance. Check continuity between the hot 30 leg and both 50 amp legs. Google the plug arrangement to understand which leg is which.
And finally, the stove top is 240 volts, as is the high amp electrical element in the Aquahot. Both require 240 volts which is both legs of 50 amp, 180 degrees out of phase. You only have one phase anytime you are on 30, 20, or 15 amp service.
Oh yeah, one more thing. You have a misunderstanding about air brakes. The park brake comes on automatically when tank pressure is below 60 psi. The park brakes are great big springs, completely mechanical. When you release the park brake YELLOW button in the cockpit, you are actually supplying air to counteract the spring. It’s a failsafe design so that you cannot drive the coach without adequate air brake pressure because you cannot release the park brake without at least 60 psig of brake tank pressure. So, NO danger of you rolling away because your 110 compressor isn’t working.
http://www.newellowner.com/newell-air-system/ That will help you, and put you to sleep too.
Richard and Rhonda Entrekin
95 Newell, 390 Ex caretaker
99 Newell, 512 Ex caretaker
07 Prevost Marathon, 1025
Maverick Hybrid Toad
Inverness, FL (when we're home
)