pin-7 mod for 100 Series
Actually the 100 Series already has the center diff switch so you can engage it in High. By default when you switch to the Low range the center diff locker is automaticly engaged. The pin-7 mod disables the automatic engagement so you can choose to have an open center diff in the Low range. This let's you use the low range on surfaces with high traction without drivetrain windup. Some people want this for boat docks, etc. I've found that it gives me a nice option to have the extra power and control at slow speed on some rough dirt/rock trails. When I come to any obstacle I can choose to engage the center and rear lockers as needed.
Here is Christo Slee's writeup on the 80 Series version of the mod:
http://www.sleeoffroad.com/technical/tz_cdl_pin7mod.htm
The 100 Series has the center diff control box in a different place (behind the glove box), but otherwise the mod is the same.
Here are the steps for the 100 Series (sorry I didn't take pictures):
1) Remove the glove box door (two screws on the bottom)
2) Remove the black plastic trim piece at the top of the glove box opening (3 screws)
3) Remove the three sheetmetal bolts holding the main ECU (big silver box). You don't have to unplug it, just move it out of the way so you can get to the transmission control relay on the right.
4) Find the black transmission control relay and unplug the wiring harness from the bottom. This is kind of tricky. There is a latch on the back and you have to pull down fairly hard. I used pliers to pull down and then pressed the latch with my finger.
5) Remove the pin-7 wire (black with blue tracer). The pin numbers are marked on the plug, but they are very hard to see. The Slee offroad site has good pictures showing how to remove the pin.
6) I used heat shrink to insulate the pin and labeled it so next time I'm in there I know why there is a loose wire!
7) Reassemble.
References:
http://www.sleeoffroad.com/technical/tz_cdl_pin7mod.htm
https://forum.ih8mud.com/showthread.php?t=24025&highlight=pin-7
https://forum.ih8mud.com/showthread.php?t=10678&highlight=pin-7
Maybe this should be in the FAQ.
Actually the 100 Series already has the center diff switch so you can engage it in High. By default when you switch to the Low range the center diff locker is automaticly engaged. The pin-7 mod disables the automatic engagement so you can choose to have an open center diff in the Low range. This let's you use the low range on surfaces with high traction without drivetrain windup. Some people want this for boat docks, etc. I've found that it gives me a nice option to have the extra power and control at slow speed on some rough dirt/rock trails. When I come to any obstacle I can choose to engage the center and rear lockers as needed.
Here is Christo Slee's writeup on the 80 Series version of the mod:
http://www.sleeoffroad.com/technical/tz_cdl_pin7mod.htm
The 100 Series has the center diff control box in a different place (behind the glove box), but otherwise the mod is the same.
Here are the steps for the 100 Series (sorry I didn't take pictures):
1) Remove the glove box door (two screws on the bottom)
2) Remove the black plastic trim piece at the top of the glove box opening (3 screws)
3) Remove the three sheetmetal bolts holding the main ECU (big silver box). You don't have to unplug it, just move it out of the way so you can get to the transmission control relay on the right.
4) Find the black transmission control relay and unplug the wiring harness from the bottom. This is kind of tricky. There is a latch on the back and you have to pull down fairly hard. I used pliers to pull down and then pressed the latch with my finger.
5) Remove the pin-7 wire (black with blue tracer). The pin numbers are marked on the plug, but they are very hard to see. The Slee offroad site has good pictures showing how to remove the pin.
6) I used heat shrink to insulate the pin and labeled it so next time I'm in there I know why there is a loose wire!
7) Reassemble.
References:
http://www.sleeoffroad.com/technical/tz_cdl_pin7mod.htm
https://forum.ih8mud.com/showthread.php?t=24025&highlight=pin-7
https://forum.ih8mud.com/showthread.php?t=10678&highlight=pin-7
Maybe this should be in the FAQ.