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FC (Forward Control Unique Issues) If you have a unique issue with your FC model coach and it can't be answered in one of the other forums here, then this is where you can list it.......List your FC Parts here too.

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  #21  
Old 02-05-2020
mattafact mattafact is offline
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Is this the solenoid? I see 2 wires and 2 air lines.



Am I looking for voltage on both wires when the key is on?


If I disconnect it will it turn the fan off?
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  #22  
Old 02-05-2020
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If that is the correct solenoid then de-energizing it will cause the fan to turn on
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  #23  
Old 02-05-2020
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That is the correct solenoid for the horton.
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1988 FC-35SB 300HP/ZF (2016-current)
1978 GMC Royale 26' (2015-2016)
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  #24  
Old 02-06-2020
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Quote:
Originally Posted by mattafact View Post
Attachment 66163


Is this the solenoid? I see 2 wires and 2 air lines.



Am I looking for voltage on both wires when the key is on?


If I disconnect it will it turn the fan off?
If the solenoid is energized you will see 12 volts on one side and 0 on the other. If the solenoid is not energized you will see 12 volts on both sides. When the solenoid is not energized the fan should run.

The override switch and/or the temperature switch open the ground side when active.

The fan is engaged by air pressure. The solenoid valve is a Normally Open valve meaning is passes pressure when inactive and blocks it when active.

Since your fan is stuck ON, that means the solenoid is OFF. I would suspect a wiring issue.
Attached Files
File Type: pdf HortonWiring.pdf (42.1 KB, 12 views)
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Last edited by gcyeaw; 02-06-2020 at 09:47 AM.
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  #25  
Old 02-06-2020
GregOC GregOC is offline
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they fail on. air pressure is off
https://www.youtube.com/watch?v=xSrbvqoq1YE&t=1521s
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  #26  
Old 02-06-2020
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they fail on. air pressure is off
https://www.youtube.com/watch?v=xSrbvqoq1YE&t=1521s
In around minute 11 of the video, he explains how the clutch is applied by air pressure, and that was how the one on my FC operated.
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  #27  
Old 02-07-2020
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Quote:
Originally Posted by GregOC View Post
they fail on. air pressure is off
https://www.youtube.com/watch?v=xSrbvqoq1YE&t=1521s
Mine works this way: my clutch engages by applying air, this means the solenoid is normally open and electricity causes it to close, blocking the flow of air, if the solenoid fails and the engine can run and build air then the fan will run all the time. The fan will normally turn on under 2 conditions: 1 temperature goes over 197f causing the thermostatic control to ground the circuit or you activate the over ride switch which grounds the circuit. The fail safe for complete clutch failure are "get home bolts" that bolt the fan side to the hub.
*Horton made fans that work 100% the opposite way, verify how yours works. When in doubt get the numbers off it and call Horton
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  #28  
Old 02-07-2020
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Quote:
Originally Posted by Crit Bliss View Post
Mine works this way: my clutch engages by applying air, this means the solenoid is normally open and electricity causes it to close, blocking the flow of air, if the solenoid fails and the engine can run and build air then the fan will run all the time. The fan will normally turn on under 2 conditions: 1 temperature goes over 197f causing the thermostatic control to ground the circuit or you activate the over ride switch which grounds the circuit. The fail safe for complete clutch failure are "get home bolts" that bolt the fan side to the hub.
*Horton made fans that work 100% the opposite way, verify how yours works. When in doubt get the numbers off it and call Horton
Crit,
Since the solenoid is Normally-Open, it passes air when it is not energized. The temp switch and override switch are in series on the ground side. The switches interrupt the ground circuit which prevents the solenoid from activating thus it passes air and engages the clutch.
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  #29  
Old 02-07-2020
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Quote:
Originally Posted by gcyeaw View Post
Crit,
Since the solenoid is Normally-Open, it passes air when it is not energized. The temp switch and override switch are in series on the ground side. The switches interrupt the ground circuit which prevents the solenoid from activating thus it passes air and engages the clutch.
Yes, I replaced the solenoid with the engine and bought a horton product that could be set either way, we stared at that for quite a while......
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  #30  
Old 02-09-2020
mattafact mattafact is offline
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I'm stuck in a rest stop in Tulare. The trans was having issues popping in to neutral all day today so I kept having to restart the bus to get it back in gear. I pulled in to do it again and I am unable to start the bus now. I called Bruce who suggested I pull the panel with the switch which I did. One of the wires was very hot and looks burnt.

Can I cut any of these wires and jump them together to start the bus?

I checked battery voltage and that looks fine.
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