4x4 switch not working
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Mountain Pass
Joined: Jul 2020
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4x4 switch not working
91 truck. automatic hubs, 4x4 switch on dash. Pressing 4x4 switch does nothing. Did shift control module self test, checks good. Cleaned contacts in 4 x 4 switch. Problem persists. Now I want to check power between 4 x 4 switch and shift control module but I don’t know how to do that. Does anyone know which pigtail from the shift control module side and which pins to use to test power from the 4 x 4 switch?
Hotshot
Joined: Jun 2015
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I’m not sure if I still have a printout of the test procedure. My money is on the shift motor being bad. They seize up from not being used. You said that the self test worked which means that the module needs to see that the motor changed position which it most likely did not so it did not turn on the indicator light. You could try tapping on the motor to see if it will free up.
Hotshot
Joined: Jun 2015
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100% disagree. I used mine all the time in the ‘94 Bronco and it never failed to work when needed. The ‘89 Bronco II also has a push button transfer case with auto hubs and it is the same way. Works every time.
Logistics Pro
Joined: May 2017
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From: Southern OH
Some 6.0 Powerstrokes never blew head gaskets or had EGR problems either, but I wouldn't say they are reliable.
Hotshot
Joined: Jun 2015
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Well…. I never had the manual transfer case lever seize up in my any of my trucks either but there are people on here with that complaint.
It’s coming up on three weeks since this thread was started with no reply from the OP.
It’s coming up on three weeks since this thread was started with no reply from the OP.
Logistics Pro
Joined: May 2017
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From: Southern OH
That takes 60 seconds to diagnosed and can be fixed for free almost, not to mention you can shift it easily with a pair of pliers if that does happen. Compare that to tracing out wires and testing relays, fuses, switches, control modules, a shift motor, and possibly having to replace one of those which costs far more.
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Hotshot
Joined: Jun 2015
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That takes 60 seconds to diagnosed and can be fixed for free almost, not to mention you can shift it easily with a pair of pliers if that does happen. Compare that to tracing out wires and testing relays, fuses, switches, control modules, a shift motor, and possibly having to replace one of those which costs far more.
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Logistics Pro
Joined: May 2017
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From: Southern OH
I didn't say it was complicated, but it does take more time and cost more. There is literally no advantage to the electric shift. The manual shift is less complicated, more reliable, cheaper, shifts quicker and has a neutral for flat towing. The electronic shift just adds unnecessary complications, expense and less reliabilty to a system that should be simple.
Hotshot
Joined: Jun 2015
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The advantage is that the girlfriend does not have to get out to lock or unlock the (auto) hubs and simply pushes the button to go in and out of 4wd instead of moving the lever.
No flat towing so that is a moot point for me.
No flat towing so that is a moot point for me.
Logistics Pro
Joined: May 2017
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From: Southern OH
We are talking about the transfer case not the hubs, the auto hubs are even worse than the electric shift transfer case. With manual hubs and transfer case all you have to do is leave the hubs locked and pull the lever when you need 4x4, and it will actually work unlike the auto system.
Hotshot
Joined: Jun 2015
Posts: 12,878
Likes: 2,446
We are talking about the transfer case not the hubs, the auto hubs are even worse than the electric shift transfer case. With manual hubs and transfer case all you have to do is leave the hubs locked and pull the lever when you need 4x4, and it will actually work unlike the auto system.
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