Leveling System problems 1998 Brave W32

[TomHuff]

With the coach engine running; when I turned the lift system control panel power switch to the ON position, the pump motor "does not" start. The red "parking brake light" on the control panel comes on momentarily and then goes out half a second later.

There does not seem to be any battery power going to the hydraulic pump motor or its starting solenoid. When I short across (bypassing) the motor starting solenoid, the pump motor still does not start. The dash "Auto Park" light remains lit when the control panel is ON. The fuse near the starting solenoid is good.

Does anyone have a circuit diagram of that system?
Is there another relay in that circuit?
Email address is [personal info removed]
Comments are welcome and appreciated.

Thank you,
Tom

[Morich]

With those points mentioned, I might first look at the intermitant light as it should be solid and it will not let you move forward on jacking without the brake on!
If you reach down and wiggle the pedal, does the light flicker on/off to say the switch is loose? The nut holding it may be getting loose!!!

Also the park brake is a switch which is kind of common as a problem. Terrible place to get the body in to look but often not that hard to find and fix!

If you can get the body wrapped around well enough to see, you may spot a switch from looking for wires near the pedal movement. It is a very simple thing in those I've looked at but just a lever or switch of some fashion which makes contact with the pedal that we move?

However there are two different wiring sets on the drawings. Both look somewhat the same but are you on Ford or Chevy?
Two sets of info here, depending on which chassis!
https://www.winnebago.com/Files/File...998/126574.pdf
I snipped the Chevy where the wire LD is on 3rd fuse from left but on fifth from left if other chassis! Is this a dash that lifts to find the fuse panels?
Click for better view or go direct?


There are likely to be several other connections between this fuse and the jacks so we can chase that if needed and you find good here but dead at jacks?
Small wires should be labeled if Winn wiring!

Decoder chart here lists from and to locations of wires like LD!
https://www.winnebago.com/Files/File...ical_guide.pdf

I like to bite off small chunks of confusion! I choke on the whole ball at one time!

[TomHuff]

Tom Huff <[email protected]>
11:44 AM (47 minutes ago)
to Winnebago

Thank you for the reply and great information.
Being a long term technical troubleshooter myself, now retired, I understand your good advice to bite off small chunks of confusion at a time. Otherwise, one can easily go off in the wrong direction.

The chassis is a Chevy, 454.

I have been having issues with the parking brake mechanically for quite some time, however, the hydraulic lift system has been working fine until just recently. The new issue deals with the "not in park mode" red light momentarily coming on when I turn the lift control panel power on, then the red light immediately goes out. If my aging memory serves me, I don't believe that the red control panel light ever came on when the lift system was working properly.

Which one is the intermittent light?

Thanks for your assistance, much appreciated.
Tom Huff

[Morich]

I may have confused things by calling the light intermit. My thoughts ran that if the light came on and went off shortly after, it may have been a loose switch at the parking brake mechanism. Diference in terms between intermitant and shortly after?
My thought was that a switch that was not solid may have been the cause of the odd light and if the switch is not doing it's correct thing, that may then lead to the rest of the process not moving forward.
We do have to allow room for the control board, etc. being bad but I was looking at maybe clearing any question of the park brake switch being loose as a first stop. Perhaps as simple as reaching down to jiggle the pedal a bit to see if it changed the light?
If the red light on the control is operating correctly, it should come on steady as an alarm when the park brake is not set and you turn the system on. It should not go out until you do set the brake. It should come on and stay until the brake is on, then go out and stay out as you use the jacks. I think the logic is set that the rest of the action is not allowed until the brake is on!
Thinking it might be a simple first step not giving a solid answer and the process stops, even before the jack motor starts!

I don't have the good info on when power is sent to the motor, so consider the above idea to be untested theory!

But then if the fuse panel is under a liftup dash pod, that may also be a simple starting place to check the fuse. Being the Chevy chassis, I did get lucky enough to print out the correct fuse and panel and at least one of the jacks fuses should be the third from left on top row. That assumes the panel is turned the same as the drawing!!! Find the flasher relay at bottom right?
That should mean you find 6 of the 16 gauge purple wires that Winnebago adds at the top? I've not looked at the panel and it may be more like the wiring comes in under or behind the panel as they also leave out any of the wires to other fuses!

Do the fuses have colored caps and "wht" on the drawing mean you look for a white cap on the fuse???
The decoder list shows both LD and KE as being power to the jacks. I was thinking to confirm power good through those two fuses to that first plug shown.
Trying to avoid the big chase through what is likely to be a number of different plugs enroute to the jack system as this seems to be a starting point for the power!

Second problem we have is getting the correct wiring once it leaves the provided Winnebago wires! Sometimes we have easy access to that info, sometimes not!

[Ray,IN]

You have a GM chassis; then these links should interest you, If you determine they fit your chassis, download the files to your computer. They are very old links which may disappear at any time.

GM MH chassis
https://www.gmupfitter.com/wp-conten...242Chassis.pdf
http://truckroadservice.com/barth_at...vice_part3.pdf
http://truckroadservice.com/barth_at...P30_wiring.pdf
http://barthmobile.com/groupee_files..._1979-1986.pdf
http://truckroadservice.com/barth_at...81_GM_P-30.pdf
http://truckroadservice.com/barth_at...entProcess.pdf
https://www.gmcmi.com/wp-content/upl...sis-Manual.pdf
https://www.gmupfitter.com/wp-conten...P12Chassis.pdf
https://gerberrvtruckandbus.com/

[TomHuff]

Thanks for the info and wiring diagrams
Much appreciated

[TomHuff]

Thanks for the information.
Much appreciated.