Steve Gregory Posted January 8, 2015 Share Posted January 8, 2015 A couple months ago I made my 2wd to 4wd. It works fine and dandy, but I don't have the harness that goes from the transfer case to the transmission harness connector (if that's what its called). Anybody have an idea what that harness is? If you know what I'm talking about. Thanks, Steve Link to comment Share on other sites More sharing options...
ftpiercecracker1 Posted January 9, 2015 Share Posted January 9, 2015 There is no electrical harness there. The only "harness" to speak of is a vacuum harness that is supposed to control the CAD operations and the 4x4 light in the the cab. Link to comment Share on other sites More sharing options...
gogmorgo Posted January 9, 2015 Share Posted January 9, 2015 The Vehicle Speed Sensor (VSS, i.e. speedometer sensor thing) comes off the tcase, although if you've got an '89 (like your username), then you have a mechanical speedometer, and all you'll have is a cable (I think. Do your own research). If you've got a tcase out of a later year, then the speedometer could be electrical and would be a harness of sorts. My '91 has an electric speedometer, and if my memory is correct from almost a year ago when I had my trans out, there was a connector for it at the transmission dipstick. There's also a connector there for the neutral safety switch. I don't know how the harnesses and connectors would be routed on a manual, though, where there's no trans dipstick for them to attach to. I'm also pretty sure that to get it to work with a mechanical speedometer, you'd have to change the "speedometer pickup deal"/VSS for a mechanical one, and run a speedometer cable, which would be in place of the electrical harness. You'll likely be needing a longer speedo cable, but again, do your own research. If you are just referring to the vacuum harness, as ftpiercecracker1 says, unless you feel the need for a functioning CAD (why?) then you have no need for it. It would be more work than it's worth with too many potential for leakage to get in tapped into your 2wd vacuum setup. Link to comment Share on other sites More sharing options...
Steve Gregory Posted January 12, 2015 Author Share Posted January 12, 2015 I guess I'm looking for a way to get the lights on the inside working when it is in 4wd. I know the bulbs are good, trying to figure out what it could be then... Link to comment Share on other sites More sharing options...
nitroxsteve Posted January 12, 2015 Share Posted January 12, 2015 What did your donor parts come from? Your truck would have come with a vacuum swith to turn the light on but depending on what year the tcase and front axle came from you may not have it. Link to comment Share on other sites More sharing options...
daking Posted January 12, 2015 Share Posted January 12, 2015 I'm having the same issue. There is a GM weather pack connector on the transfer case. It's a simple switch, inside the case. But I can't find the electrical connection on the harness. No vacuum 4X4 anything on my jeep. It's odd, cause the engine, transmission, and transfer case came out of a 91 Cherokee. I also transplanted the 91 electrical harness. But I still can't find the original connector on the harness. I'm thinking it may have been a pig tale, that connected to another part of the harness... They sell GM type electrical connections at some parts stores. I'll just make a new connector and run to the dash light, If I can't locate the electrical plug. Link to comment Share on other sites More sharing options...
Eagle Posted January 12, 2015 Share Posted January 12, 2015 Steven and daking: We need to know both the year of your MJs and the year of the swapped-in transfer case, AND we need to know if the donor vehicle for the transfer case had a disconnect axle or not. We also need to know if the axle you installed has the front axle disconnect and, if so, if you made it operational or if you locked it in the engaged position. Link to comment Share on other sites More sharing options...
gogmorgo Posted January 12, 2015 Share Posted January 12, 2015 My '91 MJ has a CAD. The part-time light is turned on by a switch on the axle, not the tcase. Like I said before, there is a connector for the tcase, though... all the wiring from transmission and tcase connected to the harness at the rear passenger side of the motor. Link to comment Share on other sites More sharing options...
daking Posted January 12, 2015 Share Posted January 12, 2015 1987 Jeep MJ - Body, fuel tank, sender* (modified to work with 91 gauge), seat, 1991 Jeep XJ - 4.0 Engine, AW4, NP231, Front Axle, Rear Axle, Dash, Computer, Harness. Steering column Front axle is NOT CAD. Transfer-case has no vacuum connections. Is the 4X4 light controlled from the shift lever on these, or from the switch on the transfer-case? Thanks Link to comment Share on other sites More sharing options...
ggcnash Posted January 12, 2015 Share Posted January 12, 2015 1987 Jeep MJ - Body, fuel tank, sender* (modified to work with 91 gauge), seat, 1991 Jeep XJ - 4.0 Engine, AW4, NP231, Front Axle, Rear Axle, Dash, Computer, Harness. Steering column Front axle is NOT CAD. Transfer-case has no vacuum connections. Is the 4X4 light controlled from the shift lever on these, or from the switch on the transfer-case? Thanks My aw4/231 came from late 95 the light is controlled u switch on TC the only other connection is the vss Link to comment Share on other sites More sharing options...
ggcnash Posted January 12, 2015 Share Posted January 12, 2015 This is a 97+ 231 but you can see connections Link to comment Share on other sites More sharing options...
Steve Gregory Posted January 12, 2015 Author Share Posted January 12, 2015 My MJ is an '89 but the transfer case, I'm not sure of, my brother in laws dad worked for Jeep for over 35 years and has collected parts, jeeps etc. So I just grabbed a trans and t case and put it in. I think it's an 89 though, the front axle i know is an 89. Link to comment Share on other sites More sharing options...
ggcnash Posted January 12, 2015 Share Posted January 12, 2015 I well then your light would be working from a vacuum system Link to comment Share on other sites More sharing options...
gogmorgo Posted January 12, 2015 Share Posted January 12, 2015 There should be a tag on both the tcase and trans with the year on it. Link to comment Share on other sites More sharing options...
Steve Gregory Posted January 12, 2015 Author Share Posted January 12, 2015 I'll look into it more, thanks for the advice! Link to comment Share on other sites More sharing options...
cruiser54 Posted January 13, 2015 Share Posted January 13, 2015 How about just looking at the lever position? Link to comment Share on other sites More sharing options...
Steve Gregory Posted January 14, 2015 Author Share Posted January 14, 2015 Well, yeah. But I like to see things on my Jeep work like it would from the factory. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now