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M450 (Unique Issues) If you have a unique issue with your M450 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 M450 Parts here too. NO DISCUSSION OF ANY OF THE M450 LAWSUITS ALLOWED HERE.

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  #1  
Old 07-05-2013
Hunter Hunter is offline
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Join Date: Oct 2008
Location: Spotsylvania
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Default Guest 20 Amp Battery Charger removal and replacement

Replacing the Guest 20 Amp Battery charger on M450’s. First remove the 2 House Batteries and 1 Starting Battery on the top shelf of the battery compartment. Remember that the batteries are quite heavy, 150 pounds each. When removing the batteries to insulate the battery terminal; you have several hundred amps available to short out on the stainless steel.
After removal of the batteries, remove the sheet metal screws in the top enclosure; the 115 volt AC outlet is on the bulkhead directly above the batteries. The outlet is not accessible unless you have 5 foot long arms. The plug is in a water resistant enclosure with a latch on the back side.
I left the charger wires attached to the lower battery and used the fuse holders to disconnect the charger from the battery. Leaving the wires connected allows easy reconnection after a few house.
Remove the old battery charger from the door and replace it with the new charger; reverse the procedure to reassemble. While reassembling is a good time to replace the sheet metal screws stainless steel or new screws.
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John Boudreaux
Spotsylvania, VA
2005 M450
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Old 07-05-2013
dentmac dentmac is offline
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Location: Wiarton,Ontario
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Hi. the charger that you replaced. What batteries was it charging.? Just the 2 star
ting ?
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Ross MacKillop
2006 450 LXi
Wiarton Ontario.
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  #3  
Old 07-06-2013
Hunter Hunter is offline
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The Guest charger only charges the starting batteries.

I have attached the pictures fo the charger. The first picture is the charger on the compartment door. Picture 2 is the power corde going up through the sheet metal. Picture 3 is a view of the 115 Volt outlet on the rear firewall. Picture 4 is the outlet with the battery compartment upper sheet metal removed revealinf the 115 Volt outlet.
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John Boudreaux
Spotsylvania, VA
2005 M450
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  #4  
Old 07-06-2013
dentmac dentmac is offline
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Hi,
Great pictures-Thanks.
That little Guest charger is really 2- 10 amp chargers .Why would BB do that? The 2 batteries must be paralleled somewhere-- an isolater somewhere? What did you replace it with?
Guest Charger manual
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Ross MacKillop
2006 450 LXi
Wiarton Ontario.
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Old 07-06-2013
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rbbuscher rbbuscher is offline
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Truth be known you really don't need that charger. Your two inverter / Chargers do the same thing. The only time your little charger will help in when you shut your coach down for storage. The Guest charger will keep your engine batteries charged in storage..
I have a 30 amp charger on mine. I unplug it during camping season.
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Bob & Noelle Buscher
The Dog House
2006 M450 LXi
Elkhorn, NE
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  #6  
Old 07-08-2013
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Quote:
Originally Posted by rbbuscher View Post
Truth be known you really don't need that charger. Your two inverter / Chargers do the same thing. The only time your little charger will help in when you shut your coach down for storage. The Guest charger will keep your engine batteries charged in storage..
I have a 30 amp charger on mine. I unplug it during camping season.
Bob is right on. The problems arise when the Big Boy relay connects the two battery banks (8 + 2 starting) together. When that condition occurs that poor little charger is trying to charge all 10 batteries. Mine stays unplugged unless in storage without the inverters (practically never). My inverters keep the battery banks both charged up and the Guest charger sits, ready to go, unplugged. For plugging and unplugging, use your left hand/arm and have a spotter look in the engine compartment to guide you.

The reason for the dual charger setup is the 24 volt starting/chassis system uses 2, 12 VDC batteries and the Guest charger charges each of the two batteries separately.
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Rich D. Former Owner; '90 PT40, '99LXi43 & '06 M450 LXi (CT)
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  #7  
Old 07-15-2013
jsonday6294 jsonday6294 is offline
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Default Guest Charger

I moved my 110 volt outlet to the back of the battery box. There is enough cable length to move it. Very hard to unscrew the two SS screws holding the outlet. I then replaced with outlet/switch so I can put charger into on/off mode easy. Bob is correct about not needing this charger. Allen Barbee told me this was an after thought, because of long periods of time with coach in storage, with invertors turned off.
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John Sonday
Nashville, Tennessee
2007 Lxi 450
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Old 07-15-2013
jsonday6294 jsonday6294 is offline
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Default Guest charger

I forgot to add that I have a 30 amp charger also like Rich, and have burnt out two of them. Now I leave it in off position.
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John Sonday
Nashville, Tennessee
2007 Lxi 450
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  #9  
Old 07-16-2013
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G_man G_man is offline
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Quote:
Originally Posted by dentmac View Post
Hi,
Great pictures-Thanks.
That little Guest charger is really 2- 10 amp chargers .Why would BB do that? The 2 batteries must be paralleled somewhere-- an isolater somewhere? What did you replace it with?
Guest Charger manual
It is two 10 Amp, 12 VDC chargers because the starting two batteries are connected in series to provide 24 VDC for the bus chassis. They used two 12 VDC chargers so each one could charge one of the 12VDC batteries. A single 24VDC charger could also have been used but they are not a standard, readily available item.
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Rich D. Former Owner; '90 PT40, '99LXi43 & '06 M450 LXi (CT)
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  #10  
Old 07-16-2013
jsonday6294 jsonday6294 is offline
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Default Batt. charge

I actually have a Guest 2730, which is two 15 amp chargers.
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John Sonday
Nashville, Tennessee
2007 Lxi 450
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