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Disable the GEM to TCC

Cstoliker

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Year, Model & Trim Level
2000 Explorer XLT
95 Explorer XLT My GEM is defective and will on occasion send a constant 100% duty cycle to the TCC at un opportune times. I did the Brown wire mod and use it to engage 4WDHi when I need it. The problem is I need to set the selector to 4WD to engage the CAD. I need to disable the GEM from engaging the Transfer case so I can drive with the CAD locked and ready in case I need to manually engage the T-case.

Below is a general representation of brown wire in relation to its location in the truck,the switch I used and where it is connected.
BWM.jpg


I cut wire C thinking it was from the TC relay. But the GEM is still able to engage the transfer case. I thought wire B was from the TOD relay. Witch wire do I need to cut so the GEM cannot engage the transfer case and my switch can?
 




gijoecam

Village Idiot
Elite Explorer
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98 ExSport, '00 F-150
From the Comprehensive Brown Wire Mod thread:

gijoecam said:
Now, this is the point of no return. Clip the brown wire that goes UP AND TO THE LEFT from the splice as shown here:
2584167166_7e84688cd3.jpg

What makes you think that the GEM is defective? It's only a dumb box that does as it's programmed to do... If it's getting erroneous signals from one or more of its sensors, that can cause the same issue.
 




Cstoliker

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2000 Explorer XLT
I've ben on this issue for a while. Lights blink 6 times and it either functions at 100% duty cycle all the time (when wheels are spinning) or not at all there are other issues. In addition to the 4wd not functioning

1 Door chime is on when driver's door is open regard less of if the key is in the ignition or engine running.

2 Interior lights do not come on when doors are open.

All these things in combination point to a defective GEM?

Unless someone knows a way to test a hall effect senor? which would only explain the 4wd troubles.
 




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