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Old 09-16-2019, 10:52 AM   #1
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Urgent diagnosis needed

Hello Fellow Monaco Owners!
Please help me with an issue while we are stuck in a parking lot in SLC.


When I turn the ignition switch to 'On' the motorhome will get a signal to the dash and systems will go through a diagnostic test (ie ABS, ATC, etc) and it makes a little sound that indicates there is connection. The dash warning lights come on and then the WAIT light turns off and I can start the engine.



Today, this is NOT happening as normal.

The motorhome will start, but none of the gauges on the dash are operational.
The light comes on normally in the Allison AT panel.

The backup camera comes on.
Headlights work. Switches on left light.
Step does not automatically come in as it usually does when the key is turned on.


I have already replaced the iginition switch thinking that would fix it. This condition has happened a few times in the past 3 years, but after turning the ignition switch on and on a couple of times, it operated normally. The new ignition switch made no difference.



I have checked all fuses inside the electrical bay under the driver's window.


Huge Clue: Last week, and alarm sound come on the dash and my VOLTAGE gauge stopped showing a reading. I turned the motor off, and after a few minutes back on, and the gauge began operating normally again.
This voltage gauge is one of the gauges not responding when I turn the key on now.


Please tell me where to look next. What to check. I have been looking in my manual and in the forum here, but have not been able to find what to do next.



We are anxious to get ahead of a nasty storm coming in this evening.


Any advice would be greatly appreaciated.
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Old 09-16-2019, 11:07 AM   #2
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Look for a relay that clicks when you turn on the key.

Once found, pull it out and see if it recreates what happens. That relay may be bad.
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Old 09-16-2019, 11:59 AM   #3
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I agree. Check the relay. It should be in your front run compartment on the outside under the driver (the same place you checked fuses).
In addition to the relay, run a new ground wire to the dash. Most of the gauges utilize one ground wire and it may have corrsion on the connection. Instead of trying to find the issue, just run a new ground wire from the dash to a good chassis ground point.
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Old 09-16-2019, 12:42 PM   #4
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Extend the generator and see if you have an electrical grounding strip.
It will be silver colored with several screws that have wires under them.
I believe your dash utilizes this for its ground, try tightening the screws
or even better try cleaning the connections and tightening.

Ray
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Old 09-16-2019, 12:54 PM   #5
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In the front run bay there is a white-rogers type solenoid relay which activates some of the fuses when the ignition is turned on. Check each of the fuse blocks with meter or test light. With ignition on, all should show 12vDC. If you are not showing power on all, it could be that relay.
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Old 09-16-2019, 03:14 PM   #6
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Ditto on check ignition relay, should be in your electrical box below driver window.
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Old 09-16-2019, 08:03 PM   #7
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If you have the removable dash pad plate above the gauges I think you will find the long grounding block under it , a little left and forward.
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Old 09-16-2019, 11:29 PM   #8
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Quote:
Originally Posted by RamiDav View Post
Extend the generator and see if you have an electrical grounding strip.
It will be silver colored with several screws that have wires under them.
I believe your dash utilizes this for its ground, try tightening the screws
or even better try cleaning the connections and tightening.

Ray
X2 on checking the ground buss.....ours is mounted to the back side of the dashboard (firewall) and is easily accessible by sliding open the generator and looking about eye level in the center line, just below the windshield. Probably has 10 or 12 white wires landed under individual terminal screws. Check each terminal screw with a screw driver. Like the other guys have said, mine were a little loose one time.
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Old 09-21-2019, 12:41 PM   #9
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Not the grounding bar in dash

Quote:
Originally Posted by RamiDav View Post
Extend the generator and see if you have an electrical grounding strip.
It will be silver colored with several screws that have wires under them.
I believe your dash utilizes this for its ground, try tightening the screws
or even better try cleaning the connections and tightening.

Ray



Thank you, Ray, for this suggestion. I did check the grounding bar and all appears to be snug and secure.


I was able to get my rig repaired and we are back on the road. It was a solenoid. Please see my post further on down this thread.
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Old 09-21-2019, 12:42 PM   #10
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Bingo!

Quote:
Originally Posted by Outbound View Post
Ditto on check ignition relay, should be in your electrical box below driver window.



You called it, Outbound.


It was the solenoid.

Please see my post further on down in this thread.
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Old 09-21-2019, 12:43 PM   #11
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Correct!

Quote:
Originally Posted by shootist View Post
If you have the removable dash pad plate above the gauges I think you will find the long grounding block under it , a little left and forward.

Yes, that is exactly where mine is also located.
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Old 09-21-2019, 01:07 PM   #12
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Problem Solved!

First of all, a big thank you to everyone who offered suggestions on where to start troubleshooting this issue after I had checked all fuses and replaced the ignition switch.


Turns out the ignition solenoid was faulty. With the key on, the solenoid was not allowing 12v power up to the other end of the solenoid.

This solenoid is located in the UPPER LEFT CORNER of my Run Power Panel under the driver's window on my particular motorhome.


please refer to the attached photos.


A friend walked me through how to use my Harbor Freight multimeter to check the operation of the solenoid to see if it was operating normally.

It was not. No 12v power was being sent to the other side of the solenoid when the ignition key was turned on, yet all other ignition operations were normal.
He gave me the part number and I went to Napa and picked up a

Phillips PHI54140 and replaced the solenoid.

Everything is operating perfectly now behind the dash...EVERYTIME I turn the ignition key on!

Hallelujah!


I big shout-out to Bend RV Repair in Bend, OR for knowing exactly where to look. Jeff stated that he has to replaced an average of 10 of those older solenoids in motorhomes each year.


What a relief to have this resolved. Thank you all here on IRV2 for being so willing to offer constructive suggestions as I navigate the continued maintenance of my oldie, but goodie, motorhome
Attached Thumbnails
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Old 09-21-2019, 01:10 PM   #13
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Bingo!

Quote:
Originally Posted by rpasetto View Post
In the front run bay there is a white-rogers type solenoid relay which activates some of the fuses when the ignition is turned on. Check each of the fuse blocks with meter or test light. With ignition on, all should show 12vDC. If you are not showing power on all, it could be that relay.

You called it, Rick!

My buddy at Bend RV Repair gave me the part number for Napa and it was directly replaced with a Phillips 12v Continuous Duty Solenoid. Perfect fit.
Part No. PHI54140
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Old 09-21-2019, 02:41 PM   #14
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Yep, that's pretty much like mine, The ign switch activates that relay which in turn passes power to a fuse panel below IIRC. (maybe it's 2). The 'original' relay on mine was a 'White Rodgers 70-111224' rated at 80a. It's supposed to be a "continuous duty" relay, but that doesn't mean for ever. The relay below is also the same model and there are a few used elsewhere in your coach too. It's worth carrying a spare.

Note that grey terminal strip in your picture. After you tighten the screws on the ground bus, it's worth checking the screws here too. I've yet to find a terminal strip or ground bar where all of the screws were tight.

Attaching a diagram of your front run box in case you do not have it.
Attached Files
File Type: pdf 02-03-DynastyElecDiagram-FrontRunBox.pdf (405.0 KB, 6 views)
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