Well, made a little progress today. Now I'm fully ready for the bell-housing fun.

HOWEVER, I do not understand the relationship between the GM and Rover wiring harnesses. I bought the re-wire kit and I bought the PSI conversions GM harness as recommended. Throughout the instruction (or maybe I'm missing something) I do not see the GM harness addressed hardly at all. There's mentioning of splicing feeder wires from the ECB and Rover harness over to the GM harness in a number of places, two of which don't seem to exist but either way once that's all done.... what is happening with all these extra connectors on the GM harness or on the Rover harness because there's essentially two of everything now........We're using some of both harnesses to accomplish the task but if that's the case, am I just cutting off from the GM harness anything that the Rover harness still has on it? Perhaps list of what is used off from each would help folks to simplify this in their heads during installation. I suspect folks will also be wondering where the GM incorporated fuse box should mount as well. A lot of little details left to mess up or not do as well as they could be done perhaps.

The two specific steps that I can't complete are on page #3 of the the Dashboard Supplemental:

VSS Rover: Says to cut ECU C0637 Pin 22 tan w/green stripe..... well I don't even have that 40-pin connector, perhaps they removed it in the re-wire but I also don't' have a tan w/green stripe wire whatsoever........
Check Engine Light Rover: Found again on C0637, Pin 20, red w/ brown stripe....... well again, I don't have that C0637 plug nor a red w/brown stripe wire whatsoever........

The rest of the cross wiring is either done already by the re-wire kit, or just a few I'm pretty clear on doing myself.

Any answers/input appreciated.

-Greg

 

Wonder the same thing. I'm thinning out my own harness. Do I remove plugs where were using the Rover sensors?

 

Since it's 3am here and while I'm thinking about it I'll answer what I can quickly and get back to the rest of your question tomorrow.

The VSS and Cel Rover wires you can't find are still in the truck. When you unplugging the harness there were 5 plugs, 4 of which are on the harness themselves. So when you get ready to throw the harness in, you'll splice it in when you're installing.

A solution needs to be taken care of for just those 2 wires getting splices so you can hook/unhook just those 2.

Matt

-edit
So to answer your prior question. While I was rewiring my own harness, it was somewhat difficult to figure out. After thinking on it for a few, it was quite easy to grasp. When you think about it, you need all of your connectors that you have for your LS harness.

For the Rover harness, the instructions were a bit vague. But you will be cutting the connections and splicing them per the dashboard manual. I'm not in front of the manual so I can't answer exactly what you need but if you want to reply I can try to help when I have a chance be in front of the manual and reply.

 

@Matt Brown and @05TurboS2K I found this website, https://discoii.wordpress.com/resources/ extremely helpful, specifically the D2 Electrical Circuit Diagrams 2003MY and D2_ElectricalCircuitDiagrams_2000. It shows both the electrical diagrams for the whole vehicle and the picture of every single plug in the vehicle. You'll need to CTRL + F a lot to find the section you need or have a question on.

 

.....

 

I wanted to clarify a few points:

Fuel:

You need to use a returnless fuel rail. Either the eBay kit should work (have not tested) or a rail from a later model truck, like Daedrix showed. Most of the ones on 3rd Gen LS have returns, which will not work.

For connecting from the Land Rover line to the GM rail, you can connect the two using a variety of methods. 6AN adapters work well. The eBay kit uses 6AN adapters so it would work too. There’s a list of the adapters on the parts sheet.

Electrical Harness:

There should be very little modification to the GM harness if you’re using one of the standalone setups. Virtually all of the connectors on the GM harness will be connected to the engine. There’s only a few spots where the GM harness will need to be spliced to the ECB and elsewhere and they are specifically stated in the manual. No connectors should be cut off the GM harness if already standalone.

The Rover harness will be thinned out. The remaining plugs are the ones essential for running the dash, transmission, and ECB. Some sensors are duplicated and need to be plumbed in, in addition to the sensors from the LS. The Rover supplies the signal for the accessories, starter, and fuel pump, etc. Some of the signals need to be filtered before going from one side to the other, and that’s what the ECB does. For other signals, there are two sensors – one for the LS and one for the Rover.

And Gilberjm was right, those two connections are part of the dashboard harness and cannot be removed from the vehicle. Lt1swap.com also has the GM wiring diagrams if needed.

To try to make this a little easier to understand, I plan on releasing more information about how this works here so that hopefully people can help each other out.

 

Thank you to everyone who has added to this thread. It's the reason I found out about this kit and decided to buy it.

I originally bought an LM4 from an 2004 Envoy. It had 83000 miles and was a complete mess. The oil had never been changed. After returning that one, I grabbed an L33 from an 07 silverado classic with 108000. I've pulled it apart and the internals look perfect.
The L33 is returnless but the LM4 is not. The L33 intake is drive by wire but i was able to get a harness from an 02 silverado off ebay that included cable throttle body, MAF, oxy sensors, map sensor and blue red ecu. There is one port in the throttle body that has to be plugged but that's it. Everything bolts on and plugs in perfectly to L33 intake. So an L33 seems pretty perfect if you can find one.

I've thinned my own harness. LT1swap.com has everything for my combo and UCanDoIt2 on youtube has the best harness videos out there. Seems overwhelming at first but I've found it fun.

I'm still working thru all this but I'll answer any questions I can.

 

Thank you everyone for continuing to provide input!!!!

Once we get a few going I think we'll be able to help each other out better as all the different combo's of engine donor platforms are covered. I've taken pics of my hiccups for an LM4 along the way for future that I'll put up when I'm wrapped up.

 

ACEngineer, I've been following this closely like many others, but missed the first round of kits. Any thoughts as to when the next round of kits will be up for sale?

 

Is this ready for my shade tree skills?