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cormier 08-10-2011 01:10 PM

Need help identifying this 24v harness
See pic -- for use in my s52 swap..

I hate electrical and wires baffle me. This harness came with my s52, only thing is I don't see a diagnostics port-- is this an obd 1 harness?

BigD 08-10-2011 01:14 PM

Bigger pics would help. The big plug in the 2nd pic looks like the diag port.

El Gato Liso 08-10-2011 01:18 PM

ya that big one in the second pic is diag. port.

i cut that off my hardness thinking it was for the automatic tranny computer.....since my m50 came from an auto............oops

cormier 08-10-2011 01:25 PM

Thanks for the help guy sorry I was looking for a GM-style plug --

I'm still confused mostly about DME stuff -- stupid question but is a red label 413 compatible with this obd2 motor without a full conversion?

BigD 08-10-2011 01:40 PM

Please post bigger pics of the harness, it still looks strange. There should be 3 relays on the fuse box side, and I only see one on the DME side.

The DME is almost fully compatible. The engine is fundamentally the same, just bigger displacement. The only catch is the injector size, so you'll need to get a conversion chip (I had one from Turner).

This is what the harness should look like:



cormier 08-10-2011 01:51 PM

From photobucket -- sery may be huge lol

There is a triple relay set on the other side of the harness, 2 green 1 orange

Thanks for the DME info ya I'll get the 21.5# tune as long as it'll work

BigD 08-10-2011 02:03 PM

Hard to say, I'm tempted to say it's an OBD2 but it still looks odd... can you post a pic of the coil harness? That will tell the tale.

The reason I'm asking is I don't see coil wiring but I also don't see the coil bar. On the OBD2 harness, the coil harness is separate, like so:

cormier 08-10-2011 02:21 PM

Ok more pictures:

Are these the relays you're talking about? They're on the other side of my harness but it looks in your picture like they may have been moved from there

The coil portion-- looks like it's attached to me :s

Your harness looks like a lot less than mine too lol I'm guessing it's had a lot removed for the e30... I haven't touched this one yet

BigD 08-10-2011 02:27 PM

That's the injector harness. It's an OBD2 harness unfortunately. I can now see the round plug for the coil harness by the DME connector.

The pic I posted is a generic M50 harness, that's how it should look.

cormier 08-10-2011 02:29 PM

I also just dug this up, which has obviously been cut... I think I just need a new harness I'm no good with this lol

BigD 08-10-2011 02:32 PM

Yeah, that's an OBD2 coil harness, with the plug chopped off for some bizarre reason.

Yeah get another harness. Keep those coils though.

cormier 08-10-2011 02:33 PM

Lol ya I think that's my best bet thanks for the info

BigD 08-10-2011 02:37 PM

You're welcome. What's your general plan of attack? There isn't much customizing that you need to do on this swap but there is some. If you get a harness adapter, you solve most of it. What's your plan for the temp sender, and tach signal? You know that you need OBD1 sensors right? (obd1 m50 cam, crank, temp for dme, m20 temp for cluster)

cormier 08-10-2011 02:42 PM

Ya I have most of the swap plan of attack finalized -- with the exception of the wiring which I'm just starting to get into ...

Was planning on my m10 temp sensor, and treehouse adapter -- I actually didn't know about the obd1 sensors, I have the ZA conversion cd also that goes into some detail about harness modification but I haven't gotten my head around all the bits yet

BigD 08-10-2011 03:12 PM

When you say ZA CD, do you mean the OBDII->I CD, or the 24v swap CD? The swap CD is good but they do a bit too much. The other problem with it is that they do an M50 swap, you're doing an S52. Overall the OBDI conversion is pretty trivial but none of the sensors are compatible. The S52 even has the trigger wheel at the front, and a bracket for the OBDI crank sensor, but you do need to buy one. The cam sensor is different too. The knock sensors won't work, same with the temp sensor for the engine. The S52 has a single sensor which sends the temp signal to the computer and cluster. So the head only has one sensor hole. You need to get a DME temp sensor for the one hole, and either drill/tap a hole for the cluster, or use the Zionsville temp manifold (good, clean solution).

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