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Old 07-17-2008
Wandering Wandering is offline
Junior Member
Join Date: Jun 2008
Location: Orlando
Posts: 12
Default Battery Question

Hi, How do I know which batterys are the house and which are the starting? When I start my bus I have to engage the aux battery from the generator to get it to fire quickly otherwise it cranks for quite awhile before starting. I know the batterys are 6v but I don't know if takes 2 or 4 batterys to start. Thanks for your help!
Tracy Anders
1985 PT-38
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Old 07-17-2008
Dieselbird01's Avatar
Dieselbird01 Dieselbird01 is online now
John Wyatt – Administrator/Moderator
Join Date: Feb 2008
Location: Titusville
Posts: 4,395

Hi Tracy,

On my 1984 ½ PT-36 all 6 of my batteries are 6 volt. They are wired to supply the 12 volts for starting the engine as well the 12 volt for coach power.

Later models have split systems with 12 volt starting batteries and 6 volt coach batteries but I don’t know what year they started doing it that way. My guess is that your 1985 coach is like my 1984 ½ and that all 6 of your batteries are 6 volt and all 6 are used to start the coach.

It sounds like you may have a charger problem, battery problem, connection problem, etc. In warm weather 6 good 6 volt batteries should crank the engine good enough to start the coach without needing the generator battery’s help. At least they do on my 6V92.

A few years ago I had a couple of battery cable clamps arc which melted pits in the battery posts. I had to replace the batteries and fix the cables.
John Wyatt
Titusville, Florida
1991 40' WLWB-WTB
Body Number F095567
My Location: http://www.bbirdmaps.com/user1.cfm?user=4

1991 40' WB ...From 2008 - Present
1984 ½ PT-36 .From 2000 - 2008
1973 FC-31 .....From 1991 - 2001

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Old 07-17-2008
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RGloverii RGloverii is offline
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Join Date: Jan 2008
Location: Linden, MI
Posts: 1,556


Your coach does not have coach and starting batteries.

Instead, it has one bank for 'everything but the generator', and a battery for the generator.

If you are saying that the coach doesn't like to start unless you engage the 'aux' switch, that would indicate that your main bank of batteries is either failing, or perhaps something as simple as a bad battery cable could be the issue.

I suggest checking the 6v batteries for proper water level, then give them a good charging. Check your battery cables, and clean any corrosion. Give it a shot, and see if your situation improves. If not, you're probably looking at purchasing new 6v batteries.

Robert Glover, II
91 SP36
Linden, Michigan
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Old 07-17-2008
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warbucks13477 warbucks13477 is offline
Join Date: Jun 2008
Location: Vernon Center
Posts: 1,302

If the battery levels are low DO NOT add water until the batteries are fully charged. Then add water to the proper level and let it charge again.

If the engine will not still start after driving the coach for a few miles then you have either very low water levels in the batteries, one or several bad batteries, or some cables that are either connected to the batteries and corroded or the cables to the positive and negative body stud that is corroded.

You should also check the chargers by checking the voltage at the batteries while the charger is on. Before the charger is turned on you should read less then 13VDC and after over 13VDC. Turn the chargers on one at a time so you can check each one.

good luck
Tom Warner
Vernon Center,NY
1985 PT40 SOLD
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