Community Forums

Presidio · 08-28-2017, 10:59 AM

So our coach (2010 Monaco Dynasty) in the last 2 months had intermediate start issue (the starter won't turn). I had to try a few times until the starter kicked in. A few days ago after fueling the coach did not start and I had to jump the starter. I figured maybe bad solenoid so I just installed a new one and still not starter!!

Here is what I have done so far:

1. Check that I have 12v at the switch on the steering column. Also no 12v on the solenoid when my wife tried to start.

2. Check to see if it will start from the back panel start switch (it didn't)

3. Called Monaco but got the usual " we will look for the wiring diagram and get back to you" never did!

4. I found that when my wife turn the switch to start, I hear a click at the rear panel but no power, noticed that the fuse (see attached picture) is burnt. I tried a different one and it burns as soon as you try to start the coach.

Any help to get us back on the road?? Heading to Montreal, QC....

tomckeon · 08-28-2017, 11:46 AM

battery cables/posts clean?

Presidio · 08-28-2017, 11:55 AM

Just found that the fuse will not reset and the contacts inside are burnt. Will have to find a place around that sells this.

VanDiemen23 · 08-28-2017, 12:58 PM

Stating the obvious, but tracing the runs on the board shows that whatever that relay switches is either shorted or drawing a lot more power than the fuse is rated for. You'll need to trace that circuit out and gradually disconnect everything that attaches to it until you find the short.

Starter solenoid? Inlet air heater?

Presidio · 08-28-2017, 05:21 PM

Can anyone tell me what the contactor in the picture does? The model is Trombetta 734-1221-020

Thanks.

nehog · 08-28-2017, 05:39 PM

That 'fuse' is actually a circuit breaker, and not a fuse. Replacing it with a fuse is a (generally) bad idea as the prior owner of my rig found out with the seats.

I know these are available from Rock Auto, but most good parts stores also should carry them.

jimmy braden · 08-28-2017, 08:10 PM

I am thinkin thats probably the circuit breaker for the intake grid heater. I would buy 2 and put one in and see if it starts. Turn on ign and see if the 'wait to start' light goes out in about 10 sec. The fact that its 30amp is a little strange. I think normally grid heaters are 1000w so that would be closer to 120amp DC. ... What motor is this? I Guess since you have a 45 its not a 6.7.. prob an ISL or ISX.

Presidio · 08-28-2017, 09:09 PM

My engine is an ISM500, doesn't have "wait to start" or a heater. That 30a breaker is rated at 450 current based on the manufacturer website.

jimmy braden · 08-28-2017, 09:22 PM

Quote:

Originally Posted by Presidio

My engine is an ISM500, doesn't have "wait to start" or a heater. That 30a breaker is rated at 450 current based on the manufacturer website.

hmm considering that model year, it likely has sometype of intake air heater. 2010 is pretty late for an ISM. I thought they were no longer being installed after about 2005 or 06.

You say a replacement 30a frys immediately? I can't see how that is the starter relay but I guess its possible. You got a wiring diagram for the engine/start circuit? IS that board you have a pic of identified as the start circuit? What are under the covers in the upper right of the pic?

Presidio · 08-28-2017, 09:35 PM

Quote:

Originally Posted by jimmy braden

hmm considering that model year, it likely has sometype of intake air heater. 2010 is pretty late for an ISM. I thought they were no longer being installed after about 2005 or 06.

You say a replacement 30a frys immediately? I can't see how that is the starter relay but I guess its possible. You got a wiring diagram for the engine/start circuit? IS that board you have a pic of identified as the start circuit? What are under the covers in the upper right of the pic?

Mine is a 2010 coach but the engine is 2008. I installed a REGULAR fuse, not knowing the real 30A is a "breaker" and can carry high current for short time. I cleaned the contacts inside the "bad" breaker and could start the engine two times before the breaker stopped working.

I tried getting a wiring diagram from Monaco without luck.

The upper right corner is where the rear start switch and the front/rear selector switchs are. They are black so looks like a cover.

Steve Ownby · 08-28-2017, 09:40 PM

Quote:

Originally Posted by jimmy braden

hmm considering that model year, it likely has sometype of intake air heater. 2010 is pretty late for an ISM. I thought they were no longer being installed after about 2005 or 06.

You say a replacement 30a frys immediately? I can't see how that is the starter relay but I guess its possible. You got a wiring diagram for the engine/start circuit? IS that board you have a pic of identified as the start circuit? What are under the covers in the upper right of the pic?

The ISM never had an intake heater and it was built through '09.

jimmy braden · 08-28-2017, 09:42 PM

well, it does sound like that board is for the start circuit. I would try to find the real breaker and see if it cooks immediately.. (like I said, get 2). If you get it started dont shut it off until you have at least covered some distance. Maybe when you do crank it see if you can tell any thing abnormal. I would check the + for the starter itself. If its loose it will increase current draw. If you cook a second breaker I would say there is something amiss in the starter itself.

Presidio · 08-28-2017, 09:53 PM

Quote:

Originally Posted by jimmy braden

well, it does sound like that board is for the start circuit. I would try to find the real breaker and see if it cooks immediately.. (like I said, get 2). If you get it started dont shut it off until you have at least covered some distance. Maybe when you do crank it see if you can tell any thing abnormal. I would check the + for the starter itself. If its loose it will increase current draw. If you cook a second breaker I would say there is something amiss in the starter itself.

I am going to do just that. Thanks!
P.S. I did check/clean the cables on the starter when I replaced the starter solenoid.

jimmy braden · 08-28-2017, 09:59 PM

The factory manual for my ISC says it pulls like 900 amps on start. I think the ISM is like 1200. So the fact that the breaker is only 30 means that has to be for the key or something other than the starter itself. I would think it would be the solenoid but its perplexing why you replacing it did not resolve it..