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Old 12-18-2017, 02:28 PM   #1
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Message at Startup - Mandalay Coach

2008 Mandalay Coach Presidio 400

When I start my coach up the following message is displayed:

! AUTO IDLE
SYS VOLTAGE 11.5 VOLTS
THRESHOLD 13.4 VOLTS

on some start-up the "Sys Voltage line says "13.1 VOLTS

Anybody know what this is trying to tell me and what do I do about it.
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Old 12-18-2017, 02:41 PM   #2
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Message at Startup - Mandalay Coach

.....Just going by what it says, itís telling you that you have your coach set at automatic idle as opposed you manually controlling with as an example high idle. Your system voltage on your chassis batteries at start up is 11.5 volts and the 13.4 threshold is the normal voltage your batteries should sit at and and anything above that or below I believe is when your charger itís doing what is necessary to maintain your batteries, welcoming any clarification if my explanation is not correct anywhere. There is nothing you have to do about it unless you see changes.

WDK
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Old 12-18-2017, 02:44 PM   #3
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I think, not sure, your batteries maybe going south. Couldn't hurt to have them checked.
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Old 12-18-2017, 03:00 PM   #4
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Quote:
Originally Posted by mhshaffer View Post
I think, not sure, your batteries maybe going south. Couldn't hurt to have them checked.
The chassis batteries were recently replaced(Interstate flooded cell) so I'm guessing you are talking about GEN and Engine batteries (1 each AGM type)
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Old 12-18-2017, 03:10 PM   #5
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Yes
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Old 12-18-2017, 03:12 PM   #6
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Message at Startup - Mandalay Coach

Quote:
Originally Posted by krudawg View Post
The chassis batteries were recently replaced(Interstate flooded cell) so I'm guessing you are talking about GEN and Engine batteries (1 each AGM type)


.....it seems you will have to determine exactly which batteries that message is talking about. Should be in your manual. To me itís your chassis batteries and at start up may be suffering from the load but should quickly come back up with the engine running. Get a meter and check them if there is no display telling you what they might be when they are just sitting and running.

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Old 12-18-2017, 03:46 PM   #7
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Does the voltage return to normal after a couple of minutes? If it does it is probably the engine grid heater cycling.
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Old 12-18-2017, 05:35 PM   #8
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Does the voltage return to normal after a couple of minutes? If it does it is probably the engine grid heater cycling.
Huh? whats that?
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Old 12-18-2017, 06:38 PM   #9
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Cummins engines use grid heaters ( like a toaster ) in the intake manifold to pre-heat the incoming air, so it doesn't smoke at startup. It helps with cold starting too.
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Old 12-18-2017, 11:09 PM   #10
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Ted, does your coach do this all the time? As stated, your engine has a heater grid. It usually operates in colder weather. IT draws a LOT of amperage when it turns on. Sometimes it will turn on and off a couple of times during initial startup. If yo watch your dash volt meter, you'll often see it swing back and forth as the heater turns on and off.

Side Note:.....In the old days when a coach wouldn't start, they would spray starting fluid into the engine (ether). If you do that with a modern diesel engine, you could have an explosion (ether hitting the heater grid). That's why they tell you to never spray ether into a newer diesel.
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Old 12-22-2017, 07:46 PM   #11
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Auto idle simply means that. You aren't going to (manual) fast idle.
The reason you see 11.5 volts is because the battery pulled down from the grid heater and probably the air compressor is filling the tanks.
All this is normal and the 13.1 is pretty normal voltage as the batteries recharge to the target of 13.4.
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