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  #1  
Old 10-16-2017, 10:00 AM
aroundincircles aroundincircles is offline
Ford Tough
 
Join Date: Oct 2016
Posts: 318
Default 98 4x4 blinking lights, List of things to check?

So I replaced my transfer case motor less than a year ago, and had working 4x4, but its been a few months since I've tried to use it, went to use it last week and as soon as I flicked the switch, got the dreaded blinking lights.

So from my reading, a few things to check:

1) motor? its less than a year old, and is a good brand, so I doubt its bad, but what should I check on it?

2) fuse under hood. I looked when I was on the trail, and I didn't see any blown fuses, but I'll check again.

3) vacuum lines on the hubs? Will this cause the lights to blink? or will I just not have 4wd if they have gone bad?

What else to check? My truck was my Daily driver, but I've picked something else up, and want to use the truck for more off road fun, but if the 4x4 doesn't work, then... what's the point?
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  #2  
Old 10-16-2017, 10:29 AM
CalebJ CalebJ is offline
Ford Pickup
 
Join Date: Jul 2017
Posts: 103
Default Re: 98 4x4 blinking lights, List of things to check?

To my knowledge the 4x4 shifting system doesn't know anything about the status of the hubs. All it does is apply a medium (lock) or strong (unlock) vacuum pulse to set their condition.

Do you hear any noise from the motor? As I understand it, the control module sends a signal to the motor to shift to the desired position, then waits for continuity across the right pins for that position. If that occurs, the appropriate mode light is turned on. If not, it signals the motor to reverse back to the original position and begins flashing the 4x4 lights.
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  #3  
Old 10-16-2017, 10:31 AM
aroundincircles aroundincircles is offline
Ford Tough
 
Join Date: Oct 2016
Posts: 318
Default Re: 98 4x4 blinking lights, List of things to check?

I did not hear anything. I drove it home, parked it, and then went out of town the next day I just got back last night, and was hoping to take a look at it today after work.
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