So being the noob to this XJ thing and DIY auto in general, I have been trying to button up any potential wiring issue's my 87 may have. On the drivers side firewall in the engine compartment there is a connecter where all or the majority of the wire run. I am asuming this is the master wire harness. So inspecting those wires I found a black wire with red tracer. There is a portion of the sheath missing and the wires have turned green. I have checked it for power and get nothing. I tried tracing to what it goes to and cant find it. Lookng at some other schematics I think it might be the horn relay. If it is, the horn works fine. Which makes me think its not. But in typing this I wonder if I should check it for hot when the horn is going off

Anyone have any idea's

Thanks

Hook

 

While you're in the vicinity, do this:

Renix Jeep C101 Connector Refreshing
　

The C101 connector on 1987 and 1988 Renix Jeeps was a source of electrical resistance when the vehicles were new. So much so that the factory eliminated this connector in the 1989 and 1990 models. The factory recommended cleaning this connector to insure the proper voltage and ground signals between the ECU and the fuel injection sensors. We can only imagine how this connector has become a larger source of voltage loss and increased resistance over a period of almost 25 years. The C101 connector needs to be cleaned at least once in the lifetime of your vehicle. Chances are it’s never been done before.



Almost every critical signal between the engine sensors, injectors, ECU, and some to the TCU, travel this path through the C101 connector.

The C101 connector is located on the driver’s side firewall above and behind the brake booster. It is held together with a single bolt in it’s center. To get the connectors apart, simply remove the ¼" bolt and pull the halves apart. You will find the connector is packed with a black tar like substance which has hardened over time.

Take a pocket screwdriver or the like and scrape out all the tar crap you can. Follow up by spraying out both connector halves with brake cleaner and then swabbing out the remainder of the tar. Repeat this procedure until the tar is totally removed. This may require 3 or more repetitions. Wipe out the connectors after spraying with a soft cloth.

If you have a small pick or dental tool, tweak the female connectors on the one side so they grab the pins on the opposite side a bit tighter before bolting both halves back together.

　

Revised 03-02-2013

 

[QUOTE=hookmiester;2419296]So being the noob to this XJ thing and DIY auto in general, I have been trying to button up any potential wiring issue's my 87 may have. On the drivers side firewall in the engine compartment there is a connecter where all or the majority of the wire run. I am asuming this is the master wire harness. So inspecting those wires I found a black wire with red tracer. There is a portion of the sheath missing and the wires have turned green. I have checked it for power and get nothing. I tried tracing to what it goes to and cant find it. Lookng at some other schematics I think it might be the horn relay. If it is, the horn works fine. Which makes me think its not. But in typing this I wonder if I should check it for hot when the horn is going off

Anyone have any idea's

Thanks

Is this above or below the brake booster?

 

it is above the breakbooster

 

That's the c101. Clean it out per the instructions. If it were me, and I had corroded wires, I would bypass the c101 with those wires that are messed up. Solder and shrink tube.

 

MY bad, its below the break booster. I did the cleaning on the above tho.