Date: Tue, 9 Jun 2009 17:54:40 -0700
Reply-To: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Subject: Re: Help with 12v Dometic wiring
Content-Type: text/plain; format=flowed; charset="UTF-8"; reply-type=response
that's different than the way I figured it out ......
and you could be right, and I wrong .....
but here is how I understand and diagnose.and wire that relay under the
driver's seat.
Assuming we're talking about the same thing .....
that relay is there so either 12v for fridge operation, or charging to a
aux. battery, can occur ONLY if the alternator is charging.
what I find is that the blue wire from the alternator warning light is on
one side of the 'triggering' side of the relay.
If it could just find it's way though the mini-coil inside the relay to a
ground on the other side ..........that would do the job.
I'm sure they had a good reason for doing it this way .....( instead of
having a permanent ground the 'normal way." )
This wire that we want grounded, ( to complete the circuit to energize the
relay, to send 12v where we want it ) ........
here's how that wire works to me, from my testing.
when you turn on the key , that wire is ....I forget what, but it's not
ground.
However, after your turn the key to 'start' and then back to 'on'
.................that wire becomes grounded.
and once the alternator kicks in, the relay energizes.
Mark says it's something to do with 'starter motor coil' .
that could be so.......
but in my figuring this out ............sure seems to me that it's a clever
ignition switch that supplies ground to that wire only after moving the
ignition switch from on, to start, then back to 'on', like when starting up
the engine ..........I could be wrong, but 'functionally' .....this thinking
or understanding of it 'works',
Scott
turbovans
----- Original Message -----
From: "mark drillock" <mdrillock@COX.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, June 09, 2009 3:48 PM
Subject: Re: Help with 12v Dometic wiring
> No, the wire that seems to come from the ignition switch is really a
> ground wire of sorts, through the starter motor coil. The voltage that
> triggers the relay comes in on the blue wire, from the alternator. If
> you have something other than a Bosch alternator the blue wire may not
> work anymore.
>
> Mark
>
> Rick Foster wrote:
>> Thanx Craig for your reply. Maybe I was bit hazy in my problem. I'm
>> good about the Dometic's operation, and it is all good when I bench
>> tested in the garage. I'm ready to reinstall and was checking the 12v
>> wiring in the van and found the problem I described. I checked all the
>> circuits with the a) ingnition off, b) ignition on, and c) with the
>> engine running. I don't have power to the relay accept from Bat at term
>> 87. Is this supposed to this way? Seems like there ought to be power to
>> the #12 wire coming into term 85 which connects to the ignition switch.
>> Hope that helps to de-fog my delema. Thanx for any help!
>>
>> Rick Foster
>> 85 westy
>> "Cassidy"
>>
>>
>>
>> Now I'm stumped and stymied with getting back on the road with my
>> Dometic working. It never has, but with help of Lorean and Ken, I took
>> it out, refurbished it, bench tested each system and it worked. Before
>> putting it in, I tested the 12v input and here's what I've got:
>>
>> 1- no auxillary battery, just stock wiring to'refrigerator heater
>> relay'(bently 97.32.e), plan to put in aux bat in future.
>>
>> 2- clean wiring from relay thru fuse block and to ignition switch.
>>
>> 3- + Power from bat at term 87 thru term 30 to frig connection.
>>
>> 4- continuity in blue wire from term 87 to D connection at the
>> alternator.
>>
>> 5- No Power at term 85 from the ignition switch but + continuity thru
>> this wire to the ingnition terminal (term 50). This term is coupled with
>> a #10 wire that goes I know not where. Bently (97.62) looks like it's
>> track 78, but it looks like it goes off where 'no man has been before'! I
>> can't read any 'track 78' anything functional and I'm not spark engineer.
>> Spock where you!
>>
>> Date: Mon, 8 Jun 2009 22:58:36 -0700
>> From: craig cowan <phishman068@GMAIL.COM>
>> Subject: Re: problem with 12v power to dometic frig- long
>>
>> The first thing to keep in mind is that the fridge on 12v only works
>> while
>> the engine is running, and takes quite some time to "warm up". If you
>> have
>> the fridge completely off and turn it onto 12 v and drive for 2+ hours,
>> you'll feel the fins getting cold. If you just drove around town....i
>> wouldn't expect much of anything. The 12v selection is really just to
>> keep
>> things cold while driving
>>
>>
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