I hooked my buddy Clinton up with a clean, stock 2004 Rubicon auto.
The stock 4 wheel drive switch does not work at the transfer case thus no light. The dash function test showed the light works at the cluster, no bulb issue. (Hold odometer reset and turn key on)
So, what they did was put a switch by the lockers that makes the PCM think the Jeep is in 4 lo and the lockers work once you hit it.
Never seen this and not sure how they did this and wonder what they used to signal
to the pcm to allow the locker function…my thinking would be the switch opens the loop as the t/c switch is designed to do (it’s closed at rest) but if so, why no 4wd light? Seems the pcm would light the dash up but I don’t know the circuitry.
Ultimately we will do the locker mod but we want the light regardless. The locker lights work correctly.
I’m thinking we still need a good t/c switch and then have to sort this out- just trying to get ideas in advance.
Thanks
Andy
The stock 4 wheel drive switch does not work at the transfer case thus no light. The dash function test showed the light works at the cluster, no bulb issue. (Hold odometer reset and turn key on)
So, what they did was put a switch by the lockers that makes the PCM think the Jeep is in 4 lo and the lockers work once you hit it.
Never seen this and not sure how they did this and wonder what they used to signal
to the pcm to allow the locker function…my thinking would be the switch opens the loop as the t/c switch is designed to do (it’s closed at rest) but if so, why no 4wd light? Seems the pcm would light the dash up but I don’t know the circuitry.
Ultimately we will do the locker mod but we want the light regardless. The locker lights work correctly.
I’m thinking we still need a good t/c switch and then have to sort this out- just trying to get ideas in advance.
Thanks
Andy