[T3] Mystery Wires

[Jim Adney]

Sorry, been too busy to reply to this, but we're getting some long 
needed rain today, so I've got a little more time. Read on:

On 19 Sep 2012 at 20:22, Dennis Stiefel wrote:

> Some of you guys may not approve how I am putting on this harness but I do
> it this way sometimes with FI and engine management systems on modern cars
> and it works out ok.  Since we had the FI harness off for the paint job I
> decided to install it on the engine before we install the it in the car then
> slip the part of the harness that plugs up to the ECU through the hole that
> goes in the part where the brain is mounted.

That's a perfectly reasonable way to do it. I think there was even a 
NOS complete Type 3 engine on ebay a few years ago, that appeared to 
have been crated and shipped like this.

> Everything has hooked up ok but I have 4 mystery wires I'm not sure
> where they go.  I think one goes to the temperature sensor in the left
> head but not sure on that.  The numbers on these wires are faded out
> except for one and it has the number 18 on it. 

As others have said, 18 goes to the starter terminal that gets power 
only when the starter is cranking. You can tape that wire off or 
ground it, but you MUST NOT connect it to the starter terminal that's 
hot all the time.

> Two of these wires come out behind the generator the other two comes out
> close to the wire that goes to the pressure sensor.

One of those first 2 must be for the cyl head temp sensor. I'm not 
sure about the 2nd of that pair. The second sound like the 2 that get 
power from the main power relay. There would have been a pair of 
short white wires that come into the LR corner of the engine 
compartment, just forward of the pressure sensor. Since your car had 
been converted to carbs, those might have gotten cut off.

'72s for California  also got special stuff related to enabling the 
vacuum advance only in top gear. If your harness donor car was from 
CA, you might have those connections, but I'd expect you to have even 
more, too.

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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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