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05-01-2018, 08:08 AM
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#1
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Junior Member
Monaco Owners Club Holiday Rambler Owners Club
Join Date: Jul 2016
Location: Calgary, Alberta
Posts: 23
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Warning Buzzer
I am having problems diagnosing an intermittent warning buzzer and it is driving me crazy. I have a 2005 Holiday Rambler on a Roadmaster Chassis equipped with a Cummins ISL 400hp. I have an intermittent warning buzzer coming on from under the front dash. All the gauges showing normal and the air is at a constant 120 psi and the engine light is not on. I have checked all fluid levels and everything is good. Sometimes it comes on with startup other times it comes on while driving. It usually starts very softly and will gradually increase in volume and lasts for 5 minutes to 1 hour and goes off. By the time I can get it to the mechanic the buzzer is off and we can't find the issue.
Has anyone else had this problem?
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05-01-2018, 08:26 AM
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#2
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Senior Member
Entegra Owners Club
Join Date: Jun 2014
Location: west yellowstone,Montana
Posts: 113
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When I had my diplomat it would do the same thing. So I traded it for a new integra! No really it was worse when driving in rain or snow found it to be the connection at oil pressure sending unit . Water would short the two wires and cause alarm to sound . Hope that helps you!
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05-01-2018, 06:42 PM
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#3
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Senior Member
Nor'easters Club Holiday Rambler Owners Club
Join Date: Oct 2016
Location: Monadnock Region of New Hampshire
Posts: 1,519
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I've had issues with damp conditions (harder rain) causing problems as well. In my case I believe it was a harness that was hitting a (fuel?) line and may have worn/shorted when wet.
Are there any common factors (rain for example, temperature, etc.) when it fails?
__________________
My name is Peter, and I'm never going to grow up.
- Winnebago Era 2010 Class B
- Holiday Rambler 2006 Ambassador 40-DFD Class A
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05-01-2018, 09:35 PM
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#4
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Junior Member
Monaco Owners Club Holiday Rambler Owners Club
Join Date: Jul 2016
Location: Calgary, Alberta
Posts: 23
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Warning Buzzer
There has been no common condition when the alarm goes off. Most of the time it has gone off when driving, but yesterday it went off when I started it up after sitting for 3 weeks.
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05-01-2018, 09:51 PM
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#5
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Junior Member
Monaco Owners Club Holiday Rambler Owners Club
Join Date: Jul 2016
Location: Calgary, Alberta
Posts: 23
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How did you find the intermittent short in the wiring?
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05-01-2018, 10:29 PM
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#6
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Senior Member
Entegra Owners Club
Join Date: Jun 2014
Location: west yellowstone,Montana
Posts: 113
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On my diplomat it was dumb luck. I washed coach and cleaned out cac and radiator, when I moved it alarm was going off. Next day no alarm so I got the hose out and washed around engine. Few days later I put 2and 2 together had wife sit in coach while I sprayed around with a bottle and got lucky at oil sender. Sure hope this helps you out the noise made me nuts!
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05-02-2018, 12:44 PM
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#7
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Junior Member
Monaco Owners Club Holiday Rambler Owners Club
Join Date: Jul 2016
Location: Calgary, Alberta
Posts: 23
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How did you notice where to focus was the wire bare, loose missing?
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05-02-2018, 06:03 PM
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#8
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Senior Member
Nor'easters Club Holiday Rambler Owners Club
Join Date: Oct 2016
Location: Monadnock Region of New Hampshire
Posts: 1,519
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Quote:
Originally Posted by Fred403
How did you find the intermittent short in the wiring?
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I've had similar problems with two diesel engines...
First one, it started with heavy rain causing the engine to fail to perform properly. As time went on, light rain would do the same thing. Finally it didn't require rain, it was just bad.
I started by checking all connectors for any corrosion or lose terminals/wires. On this specific vehicle I had another electrical fault where a technician had at some point punctured a wire's insulation to check for voltage. This left a hole in the insulation that allowed water to enter and in the New England salty environment the copper actually corroded away leaving a wire with what appeared to be perfect insulation being in fact open! Simple electrical diagnostics tracing down from where I had power (at the fuse) to the terminal where there was no power eventually pointed to the wire! This was the only time in about 50 years I had a wire open in the middle with no external indication of the problem! (total time to diagnose, about 2 hours.)
I knew the problem I was tracing this time was also water sensitive and initially suspected it was another damaged wire or a connector. I checked each connector, and found no problems. That left wires as the next suspect. I started checking every harness, and when I moved the main engine harness (about 60 conductors) the problem changed! Bingo, at about six to eight hours in I knew about where the problem was but not why or how.
I next removed the main connector at the engine and checked the length back to the frame/body. No flaws visible. So I then unbolted the engine side of the connector (attached to the valve cover) and lifted it. Sure enough there it was--the bracket holding the connector had an edge that rubbed through the split loam tubing and into four or five wires. Again, I ended up replacing the wires and redesigning that bracket to include a plastic wear plate to prevent future problems.
The second vehicle was my Ambassador. I picked it up from the dealer and drove home. About half way (50 miles total, so about 25 into the drive) it started to rain. I got to the town before where we live, and coming into town and down a steep hill the dash started going wild. Virtually every light came on (some dimly some bright) alarms started sounding and almost immediately the engine powered down to idle only (and not throttle response). Because the stop engine light had come on I had shut down, I tried a restart and no good same problem. I called the dealer (who had only limited technical experience) and talked to him. As suspected I knew more than he did about these things, but I am sure this scared the crap out of him! Nothing like selling an expensive coach and having the new owner have a major breakdown on his home drive! We sat there for about 15 minutes, the rain was slowed and stopped at this point. I decided to idle into a shopping center across the street and so I started up again. Wonderful! I had throttle and many of the lights were off. I figured I'd keep pushing for home, and see if we made it. Another two miles down the road all lights returned to normal, and we got home OK.
I kept looking and searching for the problem. The dealer had found out the prior owner was having a similar problem and they'd replaced some parts but apparently that didn't fix it. I continued to search, and noticed one day that the harness from the frame to the engine was touching one of the fuel lines. I pushed it away from the line and used a zip tie to try to fix it. You can be sure the next few trips were done with some nervousness. However, I did one trip with my granddaughter and we hit major rains for one whole day. Coach ran perfectly. Since then I've repeated those rainy day drives without any problems, so I'm reasonably sure that wire harness was the problem.
I've a lot of experience doing stuff like this, which helps... I feel sorry for someone who hits an electrical problem without having the experience because they often end up throwing parts at it and rarely does that result in a good fix!
__________________
My name is Peter, and I'm never going to grow up.
- Winnebago Era 2010 Class B
- Holiday Rambler 2006 Ambassador 40-DFD Class A
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05-02-2018, 06:07 PM
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#9
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Senior Member
Nor'easters Club Holiday Rambler Owners Club
Join Date: Oct 2016
Location: Monadnock Region of New Hampshire
Posts: 1,519
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Quote:
Originally Posted by Fred403
...
Has anyone else had this problem?
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Well, here is what I'd do.
If you are electrically competent.
Get that buzzer accessible. Next note all wires going into the chime module. When it is going off improperly check each with a meter and see if any are seeing the wrong voltage. It may not be exactly 12 volts for example, but some smaller voltage causing this due to leakage. Once you find the terminal that sets off the alarm, find out what it is for (wire should be marked...) and work back from there.
__________________
My name is Peter, and I'm never going to grow up.
- Winnebago Era 2010 Class B
- Holiday Rambler 2006 Ambassador 40-DFD Class A
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05-03-2018, 08:00 AM
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#10
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Senior Member
Holiday Rambler Owners Club
Join Date: Apr 2016
Posts: 596
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Fred, does it happen after releasing the parking brake? Either way stomp (rapidly) the brake pedal one time, see if it stops it. Parking brake switches are common on these to fail.
__________________
2002 Holiday Rambler Imperial 40PKD
with Residential refrigerator conversion
2014 Jeep Wrangler in tow, M&G brake system
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05-04-2018, 07:45 AM
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#11
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Junior Member
Monaco Owners Club Holiday Rambler Owners Club
Join Date: Jul 2016
Location: Calgary, Alberta
Posts: 23
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OH-OH, I think I am in trouble, I am not very mechanically inclined so I tend to throw money at a problem hoping to fix it. In the past, that doesn't work because the problem is usually something very simple that I overlooked.
I have ordered a new pressure switch for the underside of the park brake knob hoping that may be the problem.
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05-24-2018, 08:11 PM
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#12
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Senior Member
Join Date: Apr 2015
Posts: 113
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Warning Buzzer
04 Amb 330 ISC. Not uncommon that I'll get a buzzer on the first shift into 'D". I have a lazy right rear jack, that's sometimes the problem. Other times, everything is up, pressures good, and it still beeps the first time out of the blocks - then it stops and we're good all day. Lots of relays, crazy circuits, and wiggly parts - every RV out there has something 'wrong' with it. The more you use it, the more you learn which 'problems' to worry about and which to ignore.
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06-08-2018, 11:45 AM
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#13
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Senior Member
Monaco Owners Club
Join Date: Feb 2008
Posts: 2,179
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Can you describe the sound further? Is it just like a bee-buzzing, or some other sound?
Depending on the issue, there are several types of sounds/tones/whatever that are possible in the coaches (buzz, ding, chime, etc), and it may help to isolate it that way.
__________________
2008 Camelot 40’ PDQ
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11-15-2018, 08:03 AM
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#14
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Junior Member
Monaco Owners Club Holiday Rambler Owners Club
Join Date: Jul 2016
Location: Calgary, Alberta
Posts: 23
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Warning Buzzer
The warning buzzer that is going off is the under the dash, very difficult to get to and work with. It is an Enertech Part# 16613907 with 6 wires connected to it. Of course, none of the wires are marked or is it on the electrical drawings for the coach. Would anyone know what it is connected to?
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