Hayden said:
For anyone that was interested in the wiring issues on the 97+, I have some answers. This is all for 97+.......The NP242 has a 3 pin sensor and the NP231 has a 2 pin sensor. On the 231 there is a solid black wire which is the ground and there is a back wire with a red tracer, that is the wire that lights the part time light. The 242 sensor has the same 2 wires and then a black wire with a white tracer, that wire lights the full time light. Now, with a factory 231 the back wire with white tracer is in the main harness and does connect to the back of the instrument cluster. The wire ends at a plug located at the back of the engine compartment on the passanger side. There are 3 plugs all pretty close to each other, If you look at them you will see the widest plug has a black wire with white tracer on one side and not the other. So, to make the light work on the dash after adding the new 242 case I just ran a wire from the sensor and tapped it into the black wire with white tracer in that plug.
Hayden
It may not be that simple. The Jeep wiring diagrams are quite useless but you can get the idea that there is more to it.
For example, out of the 97 XJ manual
"8W-31-5
FOUR-WHEEL DRIVE (4WD) SWITCH
When the 4WD switch CLOSES, circuit Z1 provides
ground for the 4WD indicator lamp in the
instrument cluster. Circuit F87 connects to the
instrument cluster and supplies battery voltage to
the 4WD indicator lamp. Circuit G107 connects the
indicator lamp to the 4WD switch.
On vehicles equipped with the 4.0L engine and an
automatic transmission, circuit G107 connects to the
solenoid assembly in the transmission. Circuit G106
from the solenoid assembly provides ground during
4WD Full Time operation."
My '96 wiring clearly shows a connection between the tranny valve body
and the indication lights
The wiring manual of a '87 I used to have, shows a little box labeled transmission between the TC switch and lights.
Basically, I think that connecting a wire from the TC to the lights will bypass the tranny and I don't think it is supposed to do that.
All the Jeep wiring diagrams I looked at are useless due to not enough detail.
I expect a Mitchel manual and I hope it will be better.
Just in case it would be nice if people with aftermarket manuals look in to it and share what they find.