help with 3.2l conversion wiring, have a PMS 3.2l to 914-4 conversion cable but... Options

[jim912928]

Well, I have all of the mechanical work done for my 3.2l motronic conversion. Now I'm trying to figure out the wiring. I purchased the Patrick MotorSports conversion harness a few years back. It allows me to eliminate the relay board. However, electrical is not my forte...so I have some real questions on the "trunk" wires from the 3.2l harness and what to do with them. The engine, dme and wiring harness are all from the same car. So, here are my questions and you can relate them to the pictures as shown:

1. picture named "DME help" circle #1: by the dme connector...there are two little stub connections that seem to come out of the DME connector and both wires are brown....do these need to go to anything?

2. picture named "Trunk help" circle #2: I marked these fuel pump...do I cap these because I'm using the 914 wiring or do I need to connect them somewhere?

3. picture named "Trunk help" circle #3: I marked this positive battery...does the 914 harness cover this or do I need to connect it to the battery also?

3. picture named "Trunk help" circle #4: green and green/yellow wire...have no clue what this is?

4. picture named "Trunk help" circle #5: black wire by the wires I labeled "fuel pump"...have no clue what this is?

5. picture named "Trunk help" circle #6: white connector with a black, black/purple and yellow wire...have no clue what this is?

I also would like to know where you usually mount the DME and where do you pass it through from the passenger compartment into the engine compartment..and once on the engine compartment side...where do you route it up to the engine? Have pics from those angles?

Thanks all in advance!

Jim

DME help:


Trunk help:

[shoguneagle]

Hi Jim,

The info I have given you thus far is not to overwhelm you but to give you valuable information so you can check the resistance path to ensure you have everything connected right. This is info you need to make sure the connections are done right.

1. Original fuel pump from the 911 (Motronic) is what to use.

2. Original tach from 911 (Motronic) is what to use.

3. DME, altitude sensor and DME relay correct.

You have just told me that the connection jumper (Patrick) changes and matches the engine connections to the 914 car connections. This I needed to know as we proceed along this path including the oil temperature and oil pressure.

The only thing possibly not covered is the backup light switch and light wiring which on the 3.2 should be going through the engine harness on the 3.2 side of the house; 914 side goes through the wiring harness of the car; you can go either way on this wiring - look and see what Patrick has done in their jumper.

I wired my 14-pin connector in the car side to match the engine connector requirements and we both have the same wiring matches.

I am not a electrical wiring expert, but I needed the information to trace the resistance path of the engine harness to make sure I was connecting items correctly. This does not mean you have to check everything but there will be an occasion where you may need the information.

Now that I understand what you have and have covered the basis, I will go out and match your requested info to the pictures and try to get as much info as possible.

I am placing the DME, altitude sensor and fuel pump/DME relay between the seats after coming through the right side of the lower firewall. This allows the total harness to run forward to the battery, switch, and tach. I also have a very good diagram on how the connections are made. I will see if I can find it for you.

Now to get you the info in your pictures.

Steve Hurt