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Old 05-05-2013, 12:58 PM   #1
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V8 TJ Conversion Wiring Help Needed

Working on my modified harness..

For my VSS I'm using the one supplied with JB Conversions SS SYE. It is a 3 wire VSS, (signal, ground, 5v). I'm not running the stock PCM so need another source for the 5v, any easy route here?

For my backup lights, I see a 4 pin connector, new tranny has 2 pin sensor. What are the other 2 wires, I know one is ground but the 4th?
http://i913.photobucket.com/albums/a...psfd34d00b.jpg

Last, does anyone have a pinout of the two connectors shown here.


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Old 05-05-2013, 01:11 PM   #2
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I think on the VSS a GM VSS may fix that problem. Do you think the one here would work?

GM 4T65E OUTPUT SPEED SENSOR VSS 4T65E 1999-UP on eBay!

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Old 05-05-2013, 03:34 PM   #3
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Figured out backup light wiring. For vss, do I have to run a gm two wire style? What would happen if I just ran vss to speedo and not PCM?
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Old 05-08-2013, 10:24 PM   #4
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Here is what I did with my conversion, if you look at #26 it has the info on the wiring. I went with aftermarket gauges. I have since went with a gps speedo from speedhut. As far as 5 volts I think usb is 5 volts and they make a usb unit that plugs into a power port, perhaps you can make that work. Good luck with the build..here is the link. 1998 TJ small block chevy build
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Old 05-09-2013, 06:39 PM   #5
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I figured out all the wiring.. I think. The ECM has a few 5v reference wires to tap off of.
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Old 05-11-2013, 07:00 AM   #6
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Sounds like you got it and great. But for future searches IMO the best way to figure out what a plug is use the color code. Hows your build going ?
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Old 05-11-2013, 07:03 AM   #7
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Some of the wires are hard tell tell even after they were wiped clean. I ohmed out most of them to the plugs to figure it out.
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Old 05-11-2013, 07:16 AM   #8
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Quote:
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Some of the wires are hard tell tell even after they were wiped clean. I ohmed out most of them to the plugs to figure it out.
Yep plan B for sure.

Im prob going to have to pull my harness and track each wire one at a time on a bench or something . I cant figure out why my ecu keeps thinking the driver side O2 is not there. The harness was modded by a guy that flashed the ecu. It runs, but for the 02 code, perfect. My thoughts on mine is he might have a wire going to the wrong pin or something. I have checked volts and changed o2. I haven't tested since changing the o2 sensors (In the middle of axle swap so that issue is next on list)
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Old 05-11-2013, 08:09 AM   #9
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Running custom exhaust? May need to add a spacer so the sensor isn't so sensitive. I know my g35 threw codes with long tube headers until I did that. If you hook up a decent scan tool you can compare output and see if its a dead signal or just out of range.
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Old 05-11-2013, 08:27 AM   #10
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Old 05-11-2013, 08:34 AM   #11
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Running custom exhaust? May need to add a spacer so the sensor isn't so sensitive. I know my g35 threw codes with long tube headers until I did that. If you hook up a decent scan tool you can compare output and see if its a dead signal or just out of range.
I hadnt thought of that , it is a custom exhaust but is using the stock headers. I think the exhaust tubes are too small. I left it with a guy and told him 2" and I picked it up and its 1 1/2 but its is true duals. (I told that can rob torque IDK) I thought true duals was a good thing. :-) It sounds good
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Old 05-11-2013, 09:05 AM   #12
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No x or h pipe? That could cause it maybe.. That is designed to equalize pressure between sides on the compression stroke. I plan on running the two into one right near the tranny, then do a e-cutout and run single back with dual mufflers. So I can have loud at the push of a button. Prob run 2-1/2 all the way back.
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Old 05-11-2013, 05:31 PM   #13
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No x or h pipe? That could cause it maybe.. That is designed to equalize pressure between sides on the compression stroke. I plan on running the two into one right near the tranny, then do a e-cutout and run single back with dual mufflers. So I can have loud at the push of a button. Prob run 2-1/2 all the way back.
Nope no cross over at all just straight dual.

Yea I should have just made him redo it to 2 or 2 1/2 , he did it very very cheap so I couldn't say much I guess. One of the mufflers is loose at the back prob not fixable so I plan on getting them redone and go with a better system and I guess a x pipe if you guys think it will help.

and thats cool about the push of a button :-)

Here is a link for the duals


http://%3Ca%20href%3D%22http//i620.p...22_blank%22%3E%3C/a%3E
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Old 05-11-2013, 06:09 PM   #14
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Llink is dead. Any reason you would want duals other than looks? I would just run 1 larger single to save room and cost, you wont gain much if any performance from duals. I plan on running my exhaust out the stock configuration once I have both sides merged.
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Old 05-11-2013, 09:13 PM   #15
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Llink is dead. Any reason you would want duals other than looks? I would just run 1 larger single to save room and cost, you wont gain much if any performance from duals. I plan on running my exhaust out the stock configuration once I have both sides merged.
Yea I guess its just a nostalgic thing lol and I think it sounds better. And yea it was hard to get the driver side out an area that was not intended to have an exhaust. Link hmm I'll try again.


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