| [GMCnet] 1977 Birchaven Water Heater 12 V Power Source? [message #358847] |
Tue, 22 September 2020 00:49  |
Stu Rasmussen
Messages: 130
Registered: January 2019
Location: Silverton, OR
Karma: 0
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Senior Member |
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Hi everyone!
My troubleshooting of the water heater has hit a slight snag and maybe
someone else has been down this road before.
My 77 Birchaven has an Atwood engine coolant / propane water heater with
electronic ignition for the burner.
The burner doesn't light when switched on because there is no +12 vdc to
the switch. Checking the Coachmen 12 V electrical schematic J-EL-365
doesn't even show the water heater. (The WH is adjacent to the furnace,
which does have power)
Anyone know where the water heater +12VDC power source is supposed to be
coming from?
I thought I had an 'aha' when I found a blue wire in the living area
fuse compartment area that had been clipped off at floor level for some
reason (the furnace power comes on a blue wire) but that wasn't it. I'm
going to do testing on the water heater by stealing power from the
furnace but it would be nice to know where the actual power should be
coming from. Yes, all the living area fuses are good.
Thanks in advance
Stu
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Stu Rasmussen W7QJ
Silverton, OR
'77 Birchaven
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| Re: [GMCnet] 1977 Birchaven Water Heater 12 V Power Source? [message #358860 is a reply to message #358848] |
Tue, 22 September 2020 11:25  |
Stu Rasmussen
Messages: 130
Registered: January 2019
Location: Silverton, OR
Karma: 0
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Senior Member |
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Excellent! Thank you Jim!
Apparently some PO removed / replaced the circuit breaker and instead of
putting the fuse feed connection on a +12V lug they attached it to the
breaker's ground / mounting screw. Not the best source of B+ methinks.
Thank you so much!
Stu
On 2020-09-22 02:45, James Hupy via Gmclist wrote:
> Fuses for fridge and water heater are in online fuse holders under the
> passenger side hatch cover. They are black baseline and difficult to
> see.
> My 78 Royale has them, and one was blown. I had the exact same problem
> you
> have when I first got my coach. Took some sorting as they are not
> mentioned
> in the wire schematic, but the supplemental service manual for 77 -78
> talks
> about them. If you p.m. me your phone number, I will send pix tomorrow.
> Jim Hupy
> Salem. Oregon
>
> On Mon, Sep 21, 2020, 10:50 PM Stu Rasmussen (97381.com) via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> Hi everyone!
>>
>> My troubleshooting of the water heater has hit a slight snag and maybe
>> someone else has been down this road before.
>>
>> My 77 Birchaven has an Atwood engine coolant / propane water heater
>> with
>> electronic ignition for the burner.
>>
>> The burner doesn't light when switched on because there is no +12 vdc
>> to
>> the switch. Checking the Coachmen 12 V electrical schematic J-EL-365
>> doesn't even show the water heater. (The WH is adjacent to the
>> furnace,
>> which does have power)
>>
>> Anyone know where the water heater +12VDC power source is supposed to
>> be
>> coming from?
>>
>> I thought I had an 'aha' when I found a blue wire in the living area
>> fuse compartment area that had been clipped off at floor level for
>> some
>> reason (the furnace power comes on a blue wire) but that wasn't it.
>> I'm
>> going to do testing on the water heater by stealing power from the
>> furnace but it would be nice to know where the actual power should be
>> coming from. Yes, all the living area fuses are good.
>>
>> Thanks in advance
>>
>> Stu
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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Stu Rasmussen W7QJ
Silverton, OR
'77 Birchaven
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| Re: [GMCnet] 1977 Birchaven Water Heater 12 V Power Source? [message #358861 is a reply to message #358860] |
Tue, 22 September 2020 11:54 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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I am positive that grounds will not power your circuit boards. Glad you
found the problem.
Jim Hupy
Salem, Oregon
On Tue, Sep 22, 2020, 9:26 AM Stu Rasmussen (97381.com) via Gmclist <
gmclist@list.gmcnet.org> wrote:
>
> Excellent! Thank you Jim!
>
> Apparently some PO removed / replaced the circuit breaker and instead of
> putting the fuse feed connection on a +12V lug they attached it to the
> breaker's ground / mounting screw. Not the best source of B+ methinks.
>
> Thank you so much!
>
> Stu
>
> On 2020-09-22 02:45, James Hupy via Gmclist wrote:
>> Fuses for fridge and water heater are in online fuse holders under the
>> passenger side hatch cover. They are black baseline and difficult to
>> see.
>> My 78 Royale has them, and one was blown. I had the exact same problem
>> you
>> have when I first got my coach. Took some sorting as they are not
>> mentioned
>> in the wire schematic, but the supplemental service manual for 77 -78
>> talks
>> about them. If you p.m. me your phone number, I will send pix tomorrow.
>> Jim Hupy
>> Salem. Oregon
>>
>> On Mon, Sep 21, 2020, 10:50 PM Stu Rasmussen (97381.com) via Gmclist > gmclist@list.gmcnet.org> wrote:
>>
>>> Hi everyone!
>>>
>>> My troubleshooting of the water heater has hit a slight snag and maybe
>>> someone else has been down this road before.
>>>
>>> My 77 Birchaven has an Atwood engine coolant / propane water heater
>>> with
>>> electronic ignition for the burner.
>>>
>>> The burner doesn't light when switched on because there is no +12 vdc
>>> to
>>> the switch. Checking the Coachmen 12 V electrical schematic J-EL-365
>>> doesn't even show the water heater. (The WH is adjacent to the
>>> furnace,
>>> which does have power)
>>>
>>> Anyone know where the water heater +12VDC power source is supposed to
>>> be
>>> coming from?
>>>
>>> I thought I had an 'aha' when I found a blue wire in the living area
>>> fuse compartment area that had been clipped off at floor level for
>>> some
>>> reason (the furnace power comes on a blue wire) but that wasn't it.
>>> I'm
>>> going to do testing on the water heater by stealing power from the
>>> furnace but it would be nice to know where the actual power should be
>>> coming from. Yes, all the living area fuses are good.
>>>
>>> Thanks in advance
>>>
>>> Stu
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: [GMCnet] 1977 Birchaven Water Heater 12 V Power Source? [message #358863 is a reply to message #358861] |
Tue, 22 September 2020 12:10 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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BUT, fusing the negative lead WILL disable the device if it is open!
D C "Mac" Macdonald
Amateur Radio K2GKK
Since 30 November '53
USAF and FAA, Retired
Member GMCMI & Classics
Oklahoma City, OK
"The Money Pit"
TZE166V101966
'76 ex-Palm Beach
k2gkk + hotmail dot com
________________________________
From: Gmclist on behalf of James Hupy via Gmclist
Sent: Tuesday, September 22, 2020 11:54
To: gmclist@list.gmcnet.org
Cc: James Hupy
Subject: Re: [GMCnet] 1977 Birchaven Water Heater 12 V Power Source?
I am positive that grounds will not power your circuit boards. Glad you
found the problem.
Jim Hupy
Salem, Oregon
On Tue, Sep 22, 2020, 9:26 AM Stu Rasmussen (97381.com) via Gmclist <
gmclist@list.gmcnet.org> wrote:
>
> Excellent! Thank you Jim!
>
> Apparently some PO removed / replaced the circuit breaker and instead of
> putting the fuse feed connection on a +12V lug they attached it to the
> breaker's ground / mounting screw. Not the best source of B+ methinks.
>
> Thank you so much!
>
> Stu
>
> On 2020-09-22 02:45, James Hupy via Gmclist wrote:
>> Fuses for fridge and water heater are in online fuse holders under the
>> passenger side hatch cover. They are black baseline and difficult to
>> see.
>> My 78 Royale has them, and one was blown. I had the exact same problem
>> you
>> have when I first got my coach. Took some sorting as they are not
>> mentioned
>> in the wire schematic, but the supplemental service manual for 77 -78
>> talks
>> about them. If you p.m. me your phone number, I will send pix tomorrow.
>> Jim Hupy
>> Salem. Oregon
>>
>> On Mon, Sep 21, 2020, 10:50 PM Stu Rasmussen (97381.com) via Gmclist > gmclist@list.gmcnet.org> wrote:
>>
>>> Hi everyone!
>>>
>>> My troubleshooting of the water heater has hit a slight snag and maybe
>>> someone else has been down this road before.
>>>
>>> My 77 Birchaven has an Atwood engine coolant / propane water heater
>>> with
>>> electronic ignition for the burner.
>>>
>>> The burner doesn't light when switched on because there is no +12 vdc
>>> to
>>> the switch. Checking the Coachmen 12 V electrical schematic J-EL-365
>>> doesn't even show the water heater. (The WH is adjacent to the
>>> furnace,
>>> which does have power)
>>>
>>> Anyone know where the water heater +12VDC power source is supposed to
>>> be
>>> coming from?
>>>
>>> I thought I had an 'aha' when I found a blue wire in the living area
>>> fuse compartment area that had been clipped off at floor level for
>>> some
>>> reason (the furnace power comes on a blue wire) but that wasn't it.
>>> I'm
>>> going to do testing on the water heater by stealing power from the
>>> furnace but it would be nice to know where the actual power should be
>>> coming from. Yes, all the living area fuses are good.
>>>
>>> Thanks in advance
>>>
>>> Stu
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
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