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]

Whoa!!! Let us stop before going any further! We will get you through this wiring and it is not a great problem; we just have to take a little time and see what is going on and how we can get everything tied together.

John is right. You have to use the 3.2 fuel pump, altitude sensor, and fuel pump/DME relay. These control everything regarding the engine fuel and management system. I do not know what the Patrick Wire Harness does but I believe it ties some of the engine requirements from the engine to the 914 harness thus eliminating the fuel pump fuse/relay, power relay, rear window defrost, heater fan fuse, heater fan, and a couple of items that relate to the -4 fuel injection system.

First, there are several items that need to be discussed: tachometer, fuel pump and fusing, key power, heater fan (if retained), starting, and maybe a couple of other things.

What exactly does the Patrick Wiring do and what does it change in routing wiring from the engine to the 914 wiring harness (i.e. the 14-pin connector)? Need to know from where to where on the wiring harness 14-pin (engine to 914).

Second, did you get the tachometer, altitude sensor, fuel pump/dme relay with the engine?

The probably other considerations but for now the above is enough. I will go get my schematics and notes from the garage and see what I can do to further help you out.

#6 above has a couple of things going through it; two wires (one of the black ones and the black/violet got to the tachometer from the DME and then back to the DME; I will have to get with my notes to see where the other black wire and the yellow wire goes and their functions. Once I get my notes I can tell you exactly what does what and then we can adjust accordingly.

How do I know? I am currently doing the final tracing and validation of my wiring for a 3.2 1987 Carrera engine conversion. You should get a wiring schematic (look at Pelican Board under wiring diagrams for the appropriate 914; you should have a volt/ohm meter for tracing back different wiring. The key is the 14-pin connector and once you have that setup (Patrick Wiring harness adaptor, or direct wiring) the balance falls into place. First, help me understand what the Patrick Adaptor does exactly.

For a start, the 3.2 engine 14-pin connector has the following pin assignments:

1 - Yellow Starter

2 - Red Battery B+/Alternator

3 - Green/black Oil temperature

4 - Green/red Oil pressure

5 - Red/green Ign to Backup Light switch

6 - Gray/brown Backup lights to backup light switch

7 - Open

8 - Brown/black Temperature switch to fresh air blower

9 - Green/white Oil pressure idiot light

10 - Open

11 - Blue Alternator control light (generator light)

12 - Open

13 - Black/yellow Fresh air blower power

14 - Red Battery/Alternator B+


Take the above wiring pins at the 14-pin connector with a grain of salt and verify them for your own comfort zone.

These can be traced back through the engine harness for verification; REMEMBER: DO NOT TRY TO VERIFY WITH OHM METER WITH THE HARNESS CONNECTED TO THE DME COMPUTER; ;YOU WILL RUIN THE COMPUTER!!!!

The other piece of information you may need is the computer connector pin assignment.

Enough for now; if you do not need this information, please disregard.

Steve Hurt