hello every one.. i have a 1989 cherokee with the 4.0 and auto trans the problem im having is it keeps blowing trans fuses and wont shift out of first.. i unpluged the harness going to the trans and it still blows the trans fues.. im lost on this. ps it all started after we parked it for a year.

 

start tracing wires. It sounds like you have a wire that got chewed on and is shorting out.

 

You're talking about the fuse on the harness right there by the TCU? Just lately I've been having plenty of trouble with mice! They seem to chew whatever is handy out of boardem . They hit my CCV tube on the valve cover, then sent out a team to annihilate the dust cap on my AC port. You might check those wires there to the TCU. I think they use them to get to the maps in the glove box, which may be the command center.

 

thanx.. do anny one know what color wire off the harness is for the trans power ?

 

Cruiser would be (one) that knows those pretty well. I would just guess it's the one with the fuse.

This link here has a couple pics. Also the link in post #24 leads to more stuff on what's going on there...https://www.cherokeeforum.com/f2/dec...105739/index2/

Btw, in my signature there (V),is a link to some great stuff Cruiser wrote for us Renix owners.

 

its the fuse in the main fuse box next to the kick panel that keeps blowing. ill do some moor checking tuesday as i get off work... thanx

 

Hey wingman, OK...you ARE talking about an 89. There is a tcu fuse up under the glove compartment. That's an aw4 auto....I think it should work somewhat with no elecrrics at all. (not sure). Fluid is up and OK and the shifter feels OK? I don't understand the ign lock business for the shifter whatsoever.
http://www.scribd.com/justin-goldber...-Cherokee-1989
This link has some petty good diagrams, don't make my mistake and get messed looking at a 2.5>>

 

I am having the exact same problem with my 88 4x4... keeps blowing the "TRANS" fuse in fuse box by drivers kick panel ...... the in line one is fine up under the glovebox... I unplugged TCU and it shifts fine manually..... like i said "TRANS" fuse blows as soon as i turn on the key...

 

i found the short in the wiring and repared it.. it still would not shift. i removed the computer and i can manuly shift it.. i beleave the computer is bad... i want to thank you all for your help on this and if i can i will try and help you as well thanx this forum rocks! and if anny one knows of anny one that checks and repairs them could you lett me know...

 

The "trans" fuse in the fusebox is only for the Power/Comfort switch and the reverse lights. I'll bet your Power/Comfort switch is shorted out inside. Remove it and unplug it. Then install a new fuse and see what happens.