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05-25-2018, 06:52 PM
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#1
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Member
Join Date: Oct 2017
Posts: 72
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Wiring diagram
Can’t get power to AC compressor, have power going out of relay but not at compressor. Wondering if there is a junction box midway or is it one wire all the way.
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05-25-2018, 08:43 PM
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#2
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,406
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Dash A/C compressor power, will be routed through a low pressure switch , to keep the compressor from damage from running without a charge in the system .
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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05-25-2018, 08:44 PM
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#3
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Senior Member
Join Date: Feb 2012
Location: Peoria IL
Posts: 2,085
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Are you sure you don't have a bad circuit breaker? Try witching breakers and see what happens.
__________________
2023 Ram 3500 H.O.
2020 DRV
2015 Entegra Aspire RBQ SOLD
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05-26-2018, 06:09 AM
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#4
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Member
Join Date: Oct 2017
Posts: 72
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Wiring
Have power at thermostat, bypassed pressure switch,power to relay, power out relay, don’t get to compressor.
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05-26-2018, 06:12 AM
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#5
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Member
Join Date: Oct 2017
Posts: 72
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Changed relay.
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05-28-2018, 10:02 AM
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#6
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,406
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Quote:
Originally Posted by Rwpeters
Changed relay.
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Did changing the relay ; fix your issue OR are you saying you'd already tried changing the relay and that didn't help ? 
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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05-28-2018, 12:27 PM
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#7
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Member
Join Date: Oct 2017
Posts: 72
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Changed relay twice, no power. Went to compressor and put 12 volts on lead and checked for power on relay, no power. Seams to be open between back and front of coach or a fuse somewhere.
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05-29-2018, 10:32 AM
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#8
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,406
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If the power to the relay is fuse or circuit breaker protected , it would be unusual for the wire to be fused on the relay to compressor wire.
If your chassis wiring is like mine , the wire from the front of the coach to the rear was part of the chassis wiring harness , and the dash A/C wiring , relay & circuit breakers ,were installed by the RV manufacturer and tied into the chassis harness at the front of the coach .
You may have to find a connector gone bad up in the firewall area , or string a new wire to the back of the coach.
Picture is of the connection , on my coach, right above the gen set. Hope your connection is as easy to find .
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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05-29-2018, 04:25 PM
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#9
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Member
Join Date: Oct 2017
Posts: 72
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The wiring goes from relay to conduit like yours to compressor. Just don’t know which way it runs.
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05-29-2018, 06:50 PM
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#10
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Registered User
Join Date: Jan 2018
Posts: 1,385
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I had a similar situation in my old Monaco, an Evens Tempcon system
There is a temperature switch in the system. It was bolted outside the main housing up front, with a sensor bulb that went inside and stuck into the evaporator.
It was wired in series with the compressor, as is the low pressure sensor, they were close together. It's job was to cut off the compressor if the evaporator got cold enough to freeze.
When mine failed, the compressor would never turn on.
This is the part https://www.comfortairgr.com/shop/co...apillary-tube/
There is a lot of good info on this system here. Evans Tempcon Michigan, LLC > Home
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