Ford F-150 - 1997-2003 :: 4x4 - Dash Light Blinking Very Fast
Feb 14, 2015
I bought a 1998 F250 5.4 XLT, 4x4, automatic gear shifting, electric 4x4 HI/LO switch. I'm living up on a hill and when I drove back home last time there was snow and I had to use 4x4 all the way up back home. 4x4 worked fine. I parked the truck and switched of 4x4.
But when I started the truck next time and switched in a gear the 4x4 dash light started blinking. But different to many post I read so far the 4x4 dash light is not just blinking 6 times every 2 minutes, it is blinking constantly very fast (double time of flasher) as soon as I switch in a gear, even without moving the car. The dash light is blinking regardingless to the position of the 4x4 switch. I realized that interior lamp is flashing in same rythm as the 4x4 dash light.
When I shift from 2HI to 4HI 4WD does not engage but it sounds like shift motor on transfer case is doing something. When I switch to 4LO 4WD does not engage either but the gear reduction works. I noticed that when I drive downhill and put on brakes the 4x4 dash light stops blinking for short.
What might be the problem?
What I tested so far:
- All fuses (under dash and under hood) are okay
- Relays under the hood (they switch when I connect them to 12V)
- Switched heating mode selector to panel. Air comes out of panel. Then switched on 4x4 and air comes still out of panel. Not switching to window. So vacuum pump system should be okay as well, right?
- disconnected car battery for a while. Reconnected, started engine, put in a gear and 4x4 dash light was NOT blinking any more. But as soon as I drove a few meters it started blinking again.
- When I drive the speed indicator works as well. So shouldn't be the rear speed sensor, right?
What else can I test?
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Left the truck sitting for a couple of months while working out of town. I bought this truck used with only 1 key. We rebuilt the engine and had noise issues so we don't want to drive it much until this is resolved. I went out to start the truck to move it and it would not start. It had cranked right up the week before. Now it just spins over and the theft light blinks rapidly. I've check all the door locks.
When I called a Ford dealership all the service guy would tell me is that it's going to have a new key made and I have to have the title on the truck to get it done. AND, I have to have the truck towed to a dealership to fix the problem of it not starting... The battery drained down so I took it out and charged it... only thing I can possibly think of is a low battery or maybe somebody tried to steal it while I was out of town and messed up something.
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Picked it up this evening, drove it home after dark. About a 30 mile mostly highway speed drive. Everything went fine, no problems, no hiccups......Until I turned on my last street, about a half mile from home. The battery indicator light on the dash started blinking intermittently. I didn't notice anything else, just the red battery shaped light blinking.
What would cause this, what should I check? I don't want a big problem when I haven't even transferred the title yet!
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We tried putting a scan tool to it to try to pull a code and the scan tool wont connect. I do believe its the pats system kicking, but i also think its related to this relay clicking like a mother, maybe a bad connection in the junction or something. But I am not really sure how to try to start and find the problem. i have also tried replacing the relay that clicks and the new relay does the same thing.
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