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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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  #1  
Old 05-12-2014
Andre Andre is offline
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Join Date: Apr 2010
Location: Shawinigan, Quebec
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Default Powertech battery is dead

I have to change my Powertech battery and I would like to know the best type/spec battery I should buy.
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Andre Vincent
Shawinigan, QUE, Canada

2004 M380
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  #2  
Old 05-12-2014
marvjeanm380 marvjeanm380 is offline
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Andre:

Just to remind you, the generator battery on the M380 does not charge from the chargers for the house and engine batteries. The way it was installed from the factory the only charge it receives is from the engine alternator on the generator. I installed a separate smart charger (5 amps) and it worked fine for several years. I changed batteries before I found this out and bought a gel cell to replace the one that I took out.

Good Luck.
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Marv & Jean Wheeler
2004 M380 - SOLD
Ocean Shores, WA

Amateur Radio - KG7V
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  #3  
Old 05-13-2014
Jim Brookshire Jim Brookshire is offline
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Andre,

Almost any small automotive battery will do the job. Marv is right that the generator is the only way it charges as installed by Bluebird. The best solution, IMO if you are willing to do the work, is to install a AC outlet in the compartment and use a Battery Tender or equiv. connected at all times.

AGM batteries are said to only lose about 1% per month so probably would not need to be recharged between generator uses so would be a good alternative, but would be a more expensive solution.
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  #4  
Old 05-13-2014
Andre Andre is offline
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Marv and Jim, thank you for the info. I will install an AGM battery.
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Shawinigan, QUE, Canada

2004 M380
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  #5  
Old 05-13-2014
Robert Britton Robert Britton is offline
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When in for service, Johnny Anderson mad a simple modification on my coach that works perfect for charging the generator battery.

Lets see if I remember what he did as it has been awhile...On the dash there is an "Momentary On" switch momentarily ties the generator battery to the chassis batteries to aid in starting the coach if chassis batteries are low.

Johnny replaced the "Momentary On" switch with an "ON/OFF" switch. When in the "ON" position it ties generator battery to chassis battery. When left in this position the generator battery gets charged from the alternator while driving, or from the charger while plugged into shore power.

When dry camping without shore power, just move switch to "OFF" to isolate the battery banks.

This set-up has worked great for me.
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Marathon XL40
Previously Owned; 04 M380, 88 PT-38, 87FC, 95 Weekender "Baby Bird"
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  #6  
Old 05-13-2014
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Bob Griesel Bob Griesel is offline
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Quote:
Originally Posted by Robert Britton View Post
When in for service, Johnny Anderson mad a simple modification on my coach that works perfect for charging the generator battery.

Lets see if I remember what he did as it has been awhile...On the dash there is an "Momentary On" switch momentarily ties the generator battery to the chassis batteries to aid in starting the coach if chassis batteries are low.

Johnny replaced the "Momentary On" switch with an "ON/OFF" switch. When in the "ON" position it ties generator battery to chassis battery. When left in this position the generator battery gets charged from the alternator while driving, or from the charger while plugged into shore power.

When dry camping without shore power, just move switch to "OFF" to isolate the battery banks.

This set-up has worked great for me.
The forum needs a "Like" button for posts such as this. Thanks Robert!
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Olympia, WA
84 FC31 WLII - Sold
04 M380
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Old 05-13-2014
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isp2952 isp2952 is offline
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Location: 1520 N. Binkley Rd., Larwill, IN 46764
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Quote:
Originally Posted by Bob Griesel View Post
The forum needs a "Like" button for posts such as this. Thanks Robert!
They have one. Look at the top of the thread to the right.
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  #8  
Old 05-13-2014
marvjeanm380 marvjeanm380 is offline
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Bob:

Johnn Anderson installed that mod on your coach, or at least was supposed to do so. I could never tell if it was done correctly. I guess you could tell by checking with a volt meter. Hope you are having fun.
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2004 M380 - SOLD
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  #9  
Old 05-14-2014
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DonB DonB is offline
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I have no idea when it was done, but mine has an isolation diode mounted on the wall of the left front compartment where the battery is, and it is charged from the main system. The device is blue, mostly heat sink, about 6 inches square. Didn't know it wasn't factory.
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