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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 04-26-2010
Lee Davis's Avatar
Lee Davis Lee Davis is offline
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Default Voltmeter

I actually tried keeping an eye on the voltmeter on the dash (DC Volts Coach) this last week as we were enjoying a timeshare with some friends and the bus was parked outside. All that was on was the fridge (I did not turn off the battery disconnect switches). I ran the jenny every other day for an hour, but before I did that I looked at the voltmeter (I was curious) and it was reading between 10 and 11. The genny always started fine each time. Sitting here now plugged in with the coach batteries charging the voltmeter is only reading 12.5, so I am wondering if my voltmeter is not too accurate. The Heart Freedom 25 Inverter Interface says DC Volts are 13.5 but I thought that had to do with the charging, not the actual battery voltage. The DC amps are down to 10 on the Interface and when I think the batteries need charging and turn on the genny the DC amp indicator goes up to 40-50 and then seems to come back down to 10, I assume as the batteries get charged. (At least that seems like what it does although I am not sure)

Maybe I just need a new voltage gauge on the dash?
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  #22  
Old 04-27-2010
fxdwg fxdwg is offline
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Sounds like the dash gauge is off a touch. You could double check by simply metering the batteries. Meaning put a handheld unit to them to see what you get. As long as you know your dash gauge is off and by how much it's off, why replace it? Just do the quick mental math and use it!
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  #23  
Old 04-27-2010
Doubledoc Doubledoc is offline
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Our 'auto start' is set for 12.1v at the remote unit. Besure to check the voltage at the batteries as well. It could be higher due to bad connection etc to the remote. The genny runs for 2+ hours and then shuts down. If more charging is called for , the genny will restart after about a half an hour.

For our setup the inverters seem to never charge the batteries to full charge. The charging curciut will go to 'float' and hold the batteries at 13.2 v. When the engine is started and the voltage regulator for the alternators takes over, the batteries will charge for quite some time before going to float voltage via the alternator regulator. At that point the batteries are fully charged. I believe that the inverters only charge the batteries to about 95% of capacity before going to 'float'. The 'auto start ' works fine for us and it keeps the generator battery fully charged as well.
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  #24  
Old 04-27-2010
fishfarm fishfarm is offline
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Quote:
Originally Posted by Doubledoc View Post
For our setup the inverters seem to never charge the batteries to full charge. The charging curciut will go to 'float' and hold the batteries at 13.2 v. When the engine is started and the voltage regulator for the alternators takes over, the batteries will charge for quite some time before going to float voltage via the alternator regulator. At that point the batteries are fully charged. I believe that the inverters only charge the batteries to about 95% of capacity before going to 'float'.
That may be a function/result of the charging rate. The inverters probably put more amps into the batteries than the alternator.
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  #25  
Old 04-27-2010
The Dutchman The Dutchman is offline
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I started the genny and got the batteries back up and will get a load tester to monitor the batteries. Just in case -Where's the best place to buy new batteries? Thanks for your help.
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Bob Van Dam
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  #26  
Old 04-27-2010
fishfarm fishfarm is offline
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You'll probably get different opinions to that question, but I like to buy mine from Sams Club.
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  #27  
Old 04-27-2010
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  #28  
Old 04-28-2010
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John
Please list source for digital DC volt meter.
Thanks me like it!
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  #29  
Old 04-28-2010
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Quote:
Originally Posted by Ed Wimberley View Post
John
Please list source for digital DC volt meter.
Thanks me like it!
I ordered this one last night, there are others listed that are more expensive, but I have one of these that I have used for years on the van and it is still working, we will see how long this one lasts.

http://cgi.ebay.com/ebaymotors/2-DIG...item1c0fd9c426

Here is his eBay store http://stores.ebay.com/Joes-Steering...-N-Tachometers
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  #30  
Old 04-28-2010
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Volt meter on my dash is always low I have a volt meter I plug into the cigeret lighter and it is very acurate. Camper world 16 bucks also use it in some classics to check charging system
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