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M380 (Unique Issues) If you have a unique issue with your M380 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 M380 Parts here too.

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  #21  
Old 08-10-2019
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I wonder. Did any of you who had a similar problem see the "check engine" light on the dash? Did you get stored error codes from the engine?

The comments about electrical issues reminds me that when the alarm did not sound during stop and go driving early on, I was using the alternator to charge Lithium batteries at that point. The engine was completely warmed up, so I would have expected it to sound the alarm at idle, but it didn't. Later on in the trip, the alarm sounded at idle, but the alternator was no longer charging at high rate and the voltage was higher.

Since the engine temps were similar in the two situations, but electrical loads and voltages were different, perhaps that is relevant? I'll keep an eye on things. We're now on our third multiday trip. On the first one, we did not see this issue. On the second and third, we have. Between the first and second we replaced lead acid batteries with a larger lithium system.
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  #22  
Old 08-14-2019
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Things seem to have gotten worse. We drove 250 miles. With the engine fully warmed, the idle speed was 700 rpm, the buzzer would sound and the pressure on the gauge showed zero. Increasing rpm to about 900 would stop the buzzer and show 10 to 20 psi oil pressure. Near the end of the trip, we were waiting at a gas station, idling and all the dash lights illuminated, then the engine shut off. It happened a second time as I pulled into the campground. I assume the oil pressure actually is low and the shutdown was the engine protection kicking in.

Here are some photos from the RoadRunner and Silverleaf.
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  #23  
Old 08-14-2019
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Sure looks/sounds like an electrical gremlin rather than actual oil pressure drop.
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  #24  
Old 08-14-2019
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Couldn't hurt for you to turn up the alternator to a proper 14+ voltage. Many of us did that for a lot of reasons. If you are showing only 13.6 at 1500 RPM you are definitely a candidate.
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Prior: 2004 M380 Double Slide
Prior: 1990 WB40 "Blue Thunder"
My location: www.bbirdmaps.com/user2.cfm?user=1
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  #25  
Old 08-14-2019
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Suggestion, while running the engine check the rear oil pressure gauge, if it is O, or very low, I would hookup an oil pressure gauge direct to the engine, Doc posted this..
https://www.wanderlodgeownersgroup.c...8&d=1565403025
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  #26  
Old 08-14-2019
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Quote:
Originally Posted by DonB View Post
Couldn't hurt for you to turn up the alternator to a proper 14+ voltage. Many of us did that for a lot of reasons. If you are showing only 13.6 at 1500 RPM you are definitely a candidate.
I've read some of the threads on this subject and looked closely at my alternator and its VR. I'm pretty sure it's a 3 wire adjustment VR, not the one with a screw adjustment that lets you set any desired voltage. With the 3 wire, you open up the VR and move the wire to one of 3 settings (0.4v steps IIRC).

I've watched mine charging the lithiums and it hits 100% state of charge just as the current reaches 0 amps. If I boost the voltage I suspect I'll get a faster charge, but at the risk of overcharging the lithiums, which would be expensive.

My 380 had the HTS cross connect solenoid eliminated by BlueBird when they built it, so there's no way for me to disconnect the alternator from the house batteries and turn off alternator charging. Until I replace the HTS, I can't boost the charging voltage.

It may be that the 13.6v you see is just the big lithium battery bank soaking up the current from the alternator and holding flat at that voltage as it charges.
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  #27  
Old 08-14-2019
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Quote:
Originally Posted by Dc2x4drvr View Post
Suggestion, while running the engine check the rear oil pressure gauge, if it is O, or very low, I would hookup an oil pressure gauge direct to the engine, Doc posted this..
https://www.wanderlodgeownersgroup.c...8&d=1565403025
Thanks for this suggestion! (And thanks to Doc!) I'll make up that adapter when I get home. Possibly I can find a gauge here (downeast Maine).

I forgot about the rear gauge. I'll check it next time I get the engine hot, (which will be in a couple of months).
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  #28  
Old 08-14-2019
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What do you all think of trying to boost the idle speed?

Also, where can I find a manual for the engine? Or at least service notes? On my old coach I had 4" thick of paper documentation from engine rebuilding to mere oil changes. What is available for the Cummins ISL400? Doc's oil adapter fitting design pdf notes seem to show a page from a service manual of the type I'm looking for.
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  #29  
Old 08-14-2019
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Here’s the Cummins site for parts, etc., they have a manual listed for $70..have your ESN # handy when you login..
I think the idle speed is set by the ECM, do you have the Operation & Maintenance Manual?
https://quickserve.cummins.com/qs3/portal/index.html
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2004 M380
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  #30  
Old 08-14-2019
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This manual might come up..
https://quickserve.cummins.com/qs3/p...al/en/4021418/
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Full Timing with 2 cats
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