So my son recently purchased his 87 Cherokee. Slowly been fixing odds and ends on it. Upon doing so we’ve come across some wiring that has been cut and spliced and not really knowing where they belong. I hate having loose ends and would like to connect them accordingly. Been looking at the wiring in the Haynes manual but having trouble matching wires and identifying them.

first off I have these two wires right under the center of dash. Manual states these colors are for an “engine speed sensor” the only speed sensor I’m aware of is the cable that goes into the transfer case or trans.




next up are these two wires, not exactly sure but I believe these go to the cooling fan. The cooling fan wires are also cut so there’s no plug on either end. If someone can confirm that’s what these are for I’d really appreciate it. Located drivers side engine compartment



I would like to replace the relay below as this one seems to be burnt underneath. Not sure what this relay is tho. Located driver side engine compartment



next are these two sets of wires and plugs located under the radiator and ac condenser. I don’t see any male plugs that these could attach to, possibly for a vehicle option not equipped on this jeep?




also under the hood towards the back of the engine is this piece with a small hose to the left. The other end is currently loose and not sure where it should go?





lastly is this wire towards the back passenger side of the engine compartment. It’s a red wire with a plug on it but don’t see anywhere for it to plug into. This wire splices into a larger set of wires underneath





thank you in advance, hope someone can shed some light here for me 😁

 

The plugs at the front are likely for fog lights, been a while since I've worked on a Renix xj but the relay on the fender might also be for the fog lights.
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This is the cruise control servo, i think the snall line might be the control line. Check out Cruiser54’s renix tips, it's the most comprehensive guide to anything renix cherokee.

 

thank you for the info, didnt realize those were for the fog lights as my manual listed different colors on the wiring. Greatly appreciate you pointing that out and the relay.

ill look up the post you mentioned hopefully i can figure out that line coming out of the servo you mentioned

 

anyone have any ideas about these connections? first pic wires are located under center of dash, 2nd pic is passenger side engine compartment

 

The one next to the coolant bottle is for an underhood light.

 

thank you, any idea where it plugs into? i couldnt find anything around that area

 

The light is bolted to the underside of the hood (if it's there). Mine has the retractable light.





As Kuro89 suggests, that relay may be the fog lights. Mine is located in a different spot (circled in red) but could have been relocated to where yours is now. Do you have a fog lamp switch on the dash?

 

Also check out:

https://cruiser54.com/

You can also get the 1988 FSM and Fuel Injection manual here:

https://cruiser54.com/?page_id=365

 

Well that makes sense why I couldn’t find where it goes. Look like I’m missing the light under the hood. Thank u for pointing it out tho.

fog light switch was removed by previous owner, waiting for one to show up at a junkyard but I’ll use a universal switch for the time being.

thank you for the links u provided also. Greatly appreciate that

 

I'm thinking since it had fog lights those wires on the interior were connected to a switch to turn the lights on and off.

 

The wires you spotted in the first picture are probably the leftover original wires for the crankshaft speed sensor. There was a TSB that added new wiring direct from the crank sensor to the engine computer. The TSB had you push the pins out of the engine computer connector and push in new wires that went through the firewall directly to the crank sensor, bypassing the C101 connector. YOu likely have the other ends clipped off in the engine bay. If you haven't seen it yet, checkout Cruiser's article on eliminating this problematic connector altogether, https://cruiser54.com/?p=140

 

Good call. The colors shown match the FSM.

 

thank you ill be sure to check out the link you posted and also see if these wires lead to clipped ends in engine bay

 

do you by chance have a link to the TSB you mentioned?

 

so i checked out the engine bay, dont have any cut wires in the harness that passes to thru the firewall and eventually to the c101 connector you mentioned. these wires are right next to the ECM. im guessing they probably plugged in thee at one point?