Date: Thu, 3 Nov 2011 19:44:54 -0700
Reply-To: Phil Zimmerman <philzimm1@SHAW.CA>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Phil Zimmerman <philzimm1@SHAW.CA>
Subject: Re: D15 connector revealed
In-Reply-To: <4EB33F7E.7030205@cox.net>
Content-Type: text/plain; charset=windows-1252
Aaaah, the voice of informed sense, reasonableness and a certified Vanagon guru speaks!
Explains the history (time) factor and the *why* this burnt contact occurs physically from a VAG compromise.
Still leaves this luddite lacking for a new and improved Ohm's Law; to describe this phenomena?
Ohm's law does not take into affect: time, temperature, inductance or reactance into the theory or formula.
That is my point in arguing this issue.
Pz
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On 2011-11-03, at 6:27 PM, mark drillock wrote:
> I think the magic factor may simply be TIME. The ignition coil and the crankcase vent heater get current through that pin 100% of the time that the vehicle is running.
>
> That same 86+ fuse/relay panel was fitted to various other VW cars before, during, and after it was used in Vanagons. The weak pin D15 has a paired larger pin 23 that has the same signal. In other VWs the factory used the stronger D23 pin for the same purpose the Vanagon uses the weaker pin for. IMHO a mistake was make in Vanagons when they used the weaker pin and left the stronger pin empty. I have a theory as to how the error happened. If you look at the early 86 wiring that pin had almost no load and only turned on a relay and the relay powered the other things. Some frugal engineer decided the small pin was enough for this and reserved the large pin for a future option. Then the engine compartment wiring changed and they stopped powering the coil from the relay and used the D15 pin to power it plus they added the heating element. The pin specs said it could handle the load so no wiring change was deemed needed at the dash fuse/relay end and this worked fine for 20 years before the shortcoming became apparent.
>
> Mark
>
> Phil Zimmerman wrote:
>> Conventional and simple resistive DC circuits theory says so… E=IR
>> I have no argument here David.
>>
>> However, Ohm's law does not, with any satisfaction, explain the burnt contacts Alistair et al, have experienced.
>> Some sort of magic must have occurred that sent those D15 contacts directly to ground!
>> This would burn the crap out of those contacts, as Alistair's photos depict.
>> How did this happen?
>>
>> Show me and I'll join your parade...
>>
>> Pz
>>
>> On 2011-11-03, at 3:28 PM, David Beierl wrote:
>>
>>> At 10:27 PM 11/2/2011, Phil Zimmerman wrote:
>>>> When observing burnt positive connections on anything Vanagon related;
>>>> I wonder what ground(s) were adding to the impedance that caused the heating?
>>>
>>> Any such ground problems, while decreasing circuit function as a whole, would lessen, not aggravate, contact burning at a different location.
>>>
>>> Yours,
>>> David
>>
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