Jaguar Repair: 87 XJ6 wiring harness, air flow meter, engine wiring harness


Question
QUESTION: Recently started to restore my 1987 Jaguar XJ6 4.2 liter engine.  Most the wiring under the needed to be replaced.  Purchased a new engine wiring harness.  The old harness was in bad shape when I removed it so I am not sure were all the connections reconnect.  I have 2 connections on 1 end of the harness:  1 connection goes to the alternator not sure were the other connection on that end goes.  Please help.

ANSWER: Hi Aaron,
There are two wires on the alternator and there is a wire that goes to the back of the AC compressor and on to the AC clutch. At the other end you have two large plugs that plug to the main harness. There are some small harnesses also that run along the intake manifold top rail to plug into all of the thermo switches and one to connect the ignition pulse signal to the ECU. Also there are the starter wires and the purge valve on the side of the fender well.

The injection wires should also be a separate harness that goes to the power resistors mounted low on the right fender well. The throttle position switch gets a small harness as does the air flow meter. Two wires go down under the intake manifold to connect to the two oil switches and one small plug goes to the ignition control box on the front of the intake. The distributor also plugs into the control box.

There may be more that I have forgotten, so if you have any left over tell me the location and the color code and I will try to look it up for you.

Howard

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Jaguar Repair: 87 XJ6 wiring harness, air flow meter, engine wiring harness
part  
QUESTION: Howard - Thank you for the quick response.  I have attached a picture of the alternator with a section of the harness attached.  The wire attached to the back of the alternator is brown w/black stripe.  The other wire also connected to that section of the harness, also shown in the picture is green w/light brown stripe.  Not sure were the green w/brn stripe is supposed to be connected.  I have also located the wires on the A/C compressor and A/C clutch that are on a seperate harness section with a thermal fuse.  There is a green wire feed off this thermal fuse section that is not connected to anything?  Any help would be appreciated.  Thank you, Aaron.  

Answer
Hi Aaron,
The Alt only takes two wires and they are one large brown wire (power all the time) and the smaller brown with black. The only other thing in that area is a washer pump but I don't think that is powered from that harness. The only other thing I can think of is that some Jag alternators were three wire but not the series 3 jag.

As for the AC wires I don't remember any other wires in that area either but my wiring diagram does show a green w/brown lead off of the green w/brown lead going to the compressor. The factory diagram shows both the same color and are connected in the harness and one is not used. When that happens with a factory harness it is usually covered up with the cloth insulating cover.
Howard