Transfer Case Problem

F350ShortBedDually · 2021-09-11 00:49:33

2006 Ford F350 V10 I have been having a problem with the transfer case sticking in 4WL. I can fix that problem temporarily by removing and reinstalling the two relays, it will work for a while and then stick again. I decided that maybe new relays would fix that problem. The old relay is part number FOAB-14B192-AA, The Ford dealer gave me a new part number 5M5Z 14N089 A. I had to pry up on the old relay with a small screw driver to remove it. During this process I saw a small spark. I installed the new relays and no longer had the 4WD indicator lights on the dash when switching to 4WD and the 4WD is not working. I checked the fuses and the 15 amp was good the 30 amp was blown, that was the spark! I still have no power when turning the 4WD switch. I put the old relays that were working when I removed back and still have the same problem. I do have current at pins 86 and 87 at each relay socket. Can anyone help me with this problem? Thanks Need to open spoiler to see post!

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Sep 10, 2021 | 07:49 PM

F350ShortBedDually

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Transfer Case Problem

Spoiler

Need to open spoiler to see post!

Last edited by F350ShortBedDually; Sep 10, 2021 at 07:55 PM. Reason: Need to change

Sep 11, 2021 | 03:58 AM

jarayzener

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I'm not super familiar with the 4x4, but if you're seeing sparks, then that would seem to indicate a large, or larger than normal current draw. Is the computer storing any trouble codes?

Sep 11, 2021 | 04:22 AM

JWA

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What's with this game of being required to open a spoiler to provide you with help?

Sep 11, 2021 | 07:43 AM

F350ShortBedDually

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Quote:

Originally Posted by jarayzener

I'm not super familiar with the 4x4, but if you're seeing sparks, then that would seem to indicate a large, or larger than normal current draw. Is the computer storing any trouble codes?

Yes, P1876

Sep 11, 2021 | 07:46 AM

F350ShortBedDually

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Quote:

Originally Posted by JWA

What's with this game of being required to open a spoiler to provide you with help?

No game here. I posted this problem several weeks ago on another part of this forum and had no replies. I tried to cut and past the problem and the only way I could get it to paste was through the spoiler. I don't even know what the spoiler is!

Sep 12, 2021 | 02:46 AM

jarayzener

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Looks like the P1876 indicates a "Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Failure" and points to the control circuit for the hub-lock vacuum solenoid. Not sure which fuses/relays you've been dealing with, but the presence of sparks *may* indicate a short-circuit on the control circuit for that solenoid. The manual details some circuit resistance checks. I'd probably start with a good visual inspection of the wiring upstream of the solenoid and look for obvious wire issues. Instructions are included in a PDF below. Again, I'm not familiar with the 4x4, so maybe somebody else has a better idea.

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