4x4 Wont Work - Ford Powerstroke Diesel Forum
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Old 05-28-2012, 04:05 PM
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4x4 Wont Work

First off, Im new here. I have always had Dodges, this is my first Ford.

When I turn on the key, the 4x4 light comes on, so I know the light works. When I switch the 4x4 switch to 4 Hi or 4 Lo, nothing happens. No light, no sound. I pulled the switch, and it looks like the prior owner (I have no idea who it was, I bought this truck from a dealer) was troubleshooting it because the shielding on the wire is trimmed back to expose the wire. I have read that the transfer case motors go bad often on these. But I also read that the GEM can go bad, but Im not sure if there is a GEM on my 2004. I read somewhere that they discontinued the use of GEM's in 2003. Is this true? Is there anything else i should check before buying a new motor assembly? Thanks.
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Old 05-28-2012, 04:41 PM
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check for vacuum leaks.

bailey
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Old 05-28-2012, 06:37 PM
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Thanks for the reply. Would a vacuum leak keep the 4x4 light from coming on when 4x4 is selected? I dont think vacuum, which actuates the mechanical side, would keep the dash light from coming on?
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Old 05-28-2012, 06:40 PM
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Im probably wrong though lol.
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Old 06-25-2012, 01:04 PM
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It would keep the hubs from locking, though, so your 4x4 wouldn't get to the wheels. You can try manually locking the hubs if you haven't already. Engagement on the transfer case is done with an electric motor, not vacuum.

A simple test for vacuum trouble is this. Turn on the AC. If you turn on the 4x4 switch and the AC goes to defrost, you have a vacuum leak.
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