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]

Now to give some more back ground from the schematic showing the connections, it is as follows: (I cannot take credit for it but obtained it from one of the excellent threads on Sixer conversions. I wish I could remember who did it and give full credit to where it is deserved). After five years on the project and many sources of information, it is hard to remember who actually provided the information.

After finishing the connections reflected in the drawing or schematic, I will attempt to add it to this thread as an attachment so major documentation is in one area. The only other info you may need is the DME computer pin assignments which can be found in the Bentley Manual.



Fuel Pump - located in front trunk; wired to DME Relay #1 with fuse 25amp;
red/green wire coming from DME-relay #1 pin

Start & Run - Tap into 914 harness
- from DME Relay #5 pin; black wire and is also connected to the
coil (+) in engine compartment; coil wire at coil is black

Battery (B+) - comes from battery and goes to DME Relay #6 pin; red wire
which may have to be added into the wiring harness from battery
to the DME Relay

Start Only - Tap Yellow in 94 harness; start cycle; DME #4 pin (NOT DME
(RELAY)

Tachometer - one from the car the engine came from
- black/violet from DME #21 pin (not DME Relay); need to match
with correct pin on the back of the tach (again the need for
wiring schematics)
- black wire from DME #11 (again not the DME Relay); need to
match with correct pin on the back of the tach; power and
grounds to the tach are provided on the 914 wiring side of the
house

Altitude Sensor - connector near the DME/Fuel Pump Relay Socket

I have left the 14 pin connection alone since I think the basis of matching 914 wiring to the engine wiring has been provided.

Please take everything with alot of "salt" and double check everything as you are doing it. You would be surprised how many times I got off track in wiring my project. Hope this helps.

Now to try to attach the schematic of the connections to this thread. If I have problems attaching it, you may contact me anytime and I will send it to you.

Jim, contact me off thread and I will make sure you get a copy of the schematic. For 914 wiring diagrams, Pelican has some; I do not know if Road Atlanta has any references.

Steve Hurt