Battery Set up?/

D

doyle todd

New member
Apr 7, 1999
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Could someone tell me how the batteries are set up.

I have two up front and one for the genset.

I assume that one of the batteries up front is for the engine. The other is
for the coach and the one in the Genset compartment is only for the genset.
And when you push the main/boost switch on the dash it connects the two
front batteries together.

Is this correct.

Jack Todd
1977 something. (the only making it has is LPR motor home.)
 
Jack,

Sounds like yours is a Transmode that was converted by a third party. The
setup you describe was used in the early Motorhomes(73 & 74) and all
Transmodes. Your assessment of the setup is correct. One of the two up
front is the "coach"(engine) battery and the other is the "house" battery.
If you get the GM service manual from Cinnabar, it comes with wiring
diagrams for all three electrical systems(coach, house and 110V).

Patrick

> -----Original Message-----
> From: Doyle Todd [mailto:doyle]
> Sent: Friday, April 16, 1999 9:37 AM
> To: Gmcmotorhome Org (E-mail)
> Subject: GMC: Battery Set up?/
>
>
> Could someone tell me how the batteries are set up.
>
> I have two up front and one for the genset.
>
>
> I assume that one of the batteries up front is for the
> engine. The other is
> for the coach and the one in the Genset compartment is only
> for the genset.
> And when you push the main/boost switch on the dash it
> connects the two
> front batteries together.
>
> Is this correct.
>
> Jack Todd
> 1977 something. (the only making it has is LPR motor home.)
>
 
Not so fast Patrick. My 78 Royale, started life as a Transmode and has
three batteries up front.

If you really want to be certain of what each battery powers, separately
disconnect each one's negative cable and check.

Paul Bartz

From: Patrick.Flowers
[mailto:Patrick.Flowers]
Sent: Friday, April 16, 1999 9:42 AM
Subject: RE: GMC: Battery Set up?/

Jack,

Sounds like yours is a Transmode that was converted by a third party. The
setup you describe was used in the early Motorhomes(73 & 74) and all
Transmodes. Your assessment of the setup is correct. One of the two up
front is the "coach"(engine) battery and the other is the "house" battery.

If you get the GM service manual from Cinnabar, it comes with wiring
diagrams for all three electrical systems(coach, house and 110V).

From: Doyle Todd [mailto:doyle]
Sent: Friday, April 16, 1999 9:37 AM
Subject: GMC: Battery Set up?/

Could someone tell me how the batteries are set up.

I have two up front and one for the genset.

I assume that one of the batteries up front is for the engine. The other is
for the coach and the one in the Genset compartment is only for the genset.

And when you push the main/boost switch on the dash it connects the two
front batteries together.

Is this correct.
 
Ah yes, but I'll wager that when it left the Pontiac plant headed for
Coachman, it only had two batteries up front.

Patrick

> -----Original Message-----
> From: Bartz, Paul [mailto:s9d3452]
> Sent: Friday, April 16, 1999 9:48 AM
> To: 'gmcmotorhome'
> Subject: RE: GMC: Battery Set up?/
>
>
> Not so fast Patrick. My 78 Royale, started life as a
> Transmode and has
> three batteries up front.
>
> If you really want to be certain of what each battery powers,
> separately
> disconnect each one's negative cable and check.
>
> Paul Bartz
>
> From: Patrick.Flowers
> [mailto:Patrick.Flowers]
> Sent: Friday, April 16, 1999 9:42 AM
> Subject: RE: GMC: Battery Set up?/
>
> Jack,
>
> Sounds like yours is a Transmode that was converted by a
> third party. The
> setup you describe was used in the early Motorhomes(73 &
> 74) and all
> Transmodes. Your assessment of the setup is correct. One of
> the two up
> front is the "coach"(engine) battery and the other is the
> "house" battery.
>
> If you get the GM service manual from Cinnabar, it comes with wiring
> diagrams for all three electrical systems(coach, house and 110V).
>
> From: Doyle Todd [mailto:doyle]
> Sent: Friday, April 16, 1999 9:37 AM
> Subject: GMC: Battery Set up?/
>
> Could someone tell me how the batteries are set up.
>
> I have two up front and one for the genset.
>
> I assume that one of the batteries up front is for the
> engine. The other is
> for the coach and the one in the Genset compartment is only
> for the genset.
>
> And when you push the main/boost switch on the dash it
> connects the two
> front batteries together.
>
> Is this correct.
>
 
Patrick you are right. It is a Transmode

So what about charging????

Does the Genset battery only get charged by the Genset. And is not connected
to others via a charging wire or other?

Jack Todd
1977 something

- -----Original Message-----
From: owner-gmcmotorhome
[mailto:owner-gmcmotorhome] On Behalf Of
Patrick.Flowers
Sent: Friday, April 16, 1999 8:42 AM
To: gmcmotorhome
Subject: RE: GMC: Battery Set up?/

Jack,

Sounds like yours is a Transmode that was converted by a third party. The
setup you describe was used in the early Motorhomes(73 & 74) and all
Transmodes. Your assessment of the setup is correct. One of the two up
front is the "coach"(engine) battery and the other is the "house" battery.
If you get the GM service manual from Cinnabar, it comes with wiring
diagrams for all three electrical systems(coach, house and 110V).

Patrick

> -----Original Message-----
> From: Doyle Todd [mailto:doyle]
> Sent: Friday, April 16, 1999 9:37 AM
> To: Gmcmotorhome Org (E-mail)
> Subject: GMC: Battery Set up?/
>
>
> Could someone tell me how the batteries are set up.
>
> I have two up front and one for the genset.
>
>
> I assume that one of the batteries up front is for the
> engine. The other is
> for the coach and the one in the Genset compartment is only
> for the genset.
> And when you push the main/boost switch on the dash it
> connects the two
> front batteries together.
>
> Is this correct.
>
> Jack Todd
> 1977 something. (the only making it has is LPR motor home.)
>
 
If original, the generator battery is only charged by the generator(this
"feature" should be disconnected if you go to a combination house/genset
battery like the later coaches) and the coach battery is only charged by the
engine alternator. The house battery may be charged by either the engine
alternator(thru the diode isolater) or the 12V converter.

Patrick

> -----Original Message-----
> From: Doyle Todd [mailto:doyle]
> Sent: Friday, April 16, 1999 10:04 AM
> To: gmcmotorhome
> Subject: RE: GMC: Battery Set up?/
>
>
> Patrick you are right. It is a Transmode
>
>
>
> So what about charging????
>
> Does the Genset battery only get charged by the Genset. And
> is not connected
> to others via a charging wire or other?
>
>
> Jack Todd
> 1977 something
>
>
>
> -----Original Message-----
> From: owner-gmcmotorhome
> [mailto:owner-gmcmotorhome] On Behalf Of
> Patrick.Flowers
> Sent: Friday, April 16, 1999 8:42 AM
> To: gmcmotorhome
> Subject: RE: GMC: Battery Set up?/
>
> Jack,
>
> Sounds like yours is a Transmode that was converted by a
> third party. The
> setup you describe was used in the early Motorhomes(73 &
> 74) and all
> Transmodes. Your assessment of the setup is correct. One of
> the two up
> front is the "coach"(engine) battery and the other is the
> "house" battery.
> If you get the GM service manual from Cinnabar, it comes with wiring
> diagrams for all three electrical systems(coach, house and 110V).
>
> Patrick
>
> > -----Original Message-----
> > From: Doyle Todd [mailto:doyle]
> > Sent: Friday, April 16, 1999 9:37 AM
> > To: Gmcmotorhome Org (E-mail)
> > Subject: GMC: Battery Set up?/
> >
> >
> > Could someone tell me how the batteries are set up.
> >
> > I have two up front and one for the genset.
> >
> >
> > I assume that one of the batteries up front is for the
> > engine. The other is
> > for the coach and the one in the Genset compartment is only
> > for the genset.
> > And when you push the main/boost switch on the dash it
> > connects the two
> > front batteries together.
> >
> > Is this correct.
> >
> > Jack Todd
> > 1977 something. (the only making it has is LPR motor home.)
> >
>
 
And if it is a Transmode setup, you will have a 'Bat Boost' switch that can
be set to the boost position and it will stay there. The non-transmodes
have a spring inside the switch that returns the switch to the normal
setting when you let go.

>Jack,
>
>Sounds like yours is a Transmode that was converted by a third party. The
>setup you describe was used in the early Motorhomes(73 & 74) and all
>Transmodes. Your assessment of the setup is correct. One of the two up
>front is the "coach"(engine) battery and the other is the "house" battery.
>If you get the GM service manual from Cinnabar, it comes with wiring
>diagrams for all three electrical systems(coach, house and 110V).
>
>Patrick
>
>> -----Original Message-----
>> From: Doyle Todd [mailto:doyle]
>> Sent: Friday, April 16, 1999 9:37 AM
>> To: Gmcmotorhome Org (E-mail)
>> Subject: GMC: Battery Set up?/
>>
>>
>> Could someone tell me how the batteries are set up.
>>
>> I have two up front and one for the genset.
>>
>>
>> I assume that one of the batteries up front is for the
>> engine. The other is
>> for the coach and the one in the Genset compartment is only
>> for the genset.
>> And when you push the main/boost switch on the dash it
>> connects the two
>> front batteries together.
>>
>> Is this correct.
>>
>> Jack Todd
>> 1977 something. (the only making it has is LPR motor home.)
>>
>
 
I thought that was an "Improvement" later in the production run to keep
forgetfull types from running down both batteries(and destroying the low
duty-cycle relay) by leaving it in the "Boost" position. My 73 is a
Motorhome and doesn't have the "monentary" boost switch.

Patrick

> -----Original Message-----
> From: Thom Hole [mailto:THHOLE]
> Sent: Friday, April 16, 1999 10:14 AM
> To: gmcmotorhome
> Subject: RE: GMC: Battery Set up?/
>
>
> And if it is a Transmode setup, you will have a 'Bat Boost'
> switch that can
> be set to the boost position and it will stay there. The
> non-transmodes
> have a spring inside the switch that returns the switch to the normal
> setting when you let go.
>

> >Jack,
> >
> >Sounds like yours is a Transmode that was converted by a
> third party. The
> >setup you describe was used in the early Motorhomes(73 &
> 74) and all
> >Transmodes. Your assessment of the setup is correct. One
> of the two up
> >front is the "coach"(engine) battery and the other is the
> "house" battery.
> >If you get the GM service manual from Cinnabar, it comes with wiring
> >diagrams for all three electrical systems(coach, house and 110V).
> >
> >Patrick
> >
> >> -----Original Message-----
> >> From: Doyle Todd [mailto:doyle]
> >> Sent: Friday, April 16, 1999 9:37 AM
> >> To: Gmcmotorhome Org (E-mail)
> >> Subject: GMC: Battery Set up?/
> >>
> >>
> >> Could someone tell me how the batteries are set up.
> >>
> >> I have two up front and one for the genset.
> >>
> >>
> >> I assume that one of the batteries up front is for the
> >> engine. The other is
> >> for the coach and the one in the Genset compartment is only
> >> for the genset.
> >> And when you push the main/boost switch on the dash it
> >> connects the two
> >> front batteries together.
> >>
> >> Is this correct.
> >>
> >> Jack Todd
> >> 1977 something. (the only making it has is LPR motor home.)
> >>
> >
>
 
>And if it is a Transmode setup, you will have a 'Bat Boost' switch
>that can
>be set to the boost position and it will stay there. The
>non-transmodes
>have a spring inside the switch that returns the switch to the normal
>setting when you let go.

More or less correct but actually all '73 and early '74 models had a on
or off boost switch. There were no transmodes til '75 and by then all
coaches had the momentary boost switch. Too many early owners forgot to
turn the switches off creating problems.

I believe this to be an accurate characterization of the situation.

Dave Greenberg
 
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