4x4 help

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Sep 4, 2014 | 01:45 PM

mstieber1980

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4x4 help

Need some help. I just changed the lower ball joints on both sides don't know if that matters. I now notice the 4wd won't engage. When I turn the switch on dash to put in 4wd hi. Nothing happens no lights no click nothing. It's like there is nothing there. When I start it up and runs it check the 4x4 light lights up. Any help would be great it worked perfectly last time I used it. Thinking a fuse or vacuum line.

Sep 4, 2014 | 02:03 PM

alloro

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You didn't specify a year, but for most fuse #104 under the hood controls the 4WD system.

Sep 4, 2014 | 02:04 PM

alloro

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BTW, if it were a disconnected vacuum line, the transfer case would still shift. So this sounds like an electrical issue.

Sep 4, 2014 | 02:10 PM

mstieber1980

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Sorry it is a 97 expedition EB. Yeah there is nothing happening when I switch the switch... No lights or engaging

Sep 4, 2014 | 02:14 PM

alloro

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Quote:

Originally Posted by mstieber1980

Sorry it is a 97 expedition EB.

In that case check the 30-amp fuse #17 under the hood.

Sep 4, 2014 | 02:17 PM

mstieber1980

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Will check when I get home thanks. Do these fuses just blow due to age or is there something else that would cause it

Sep 4, 2014 | 02:19 PM

alloro

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Usually something causes it to blow. But hey, nothing lasts forever so changing it is a good starting point.

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Sep 5, 2014 | 10:51 AM

alloro

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Fuse #16 has absolutely nothing to do with the 4WD system.

Perhaps when you were in there tugging on fuses you got #17 to reestablish an otherwise bad connection.

Sep 5, 2014 | 11:12 AM

#10

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Quote:

Originally Posted by alloro

Fuse #16 has absolutely nothing to do with the 4WD system.

Perhaps when you were in there tugging on fuses you got #17 to reestablish an otherwise bad connection.

Apparently it does. I have no idea why though. I asked about it a while ago. Fuse 16 was blown- had 2wd and a4wd only- replaced it and everything was right in the world again. If I remove the fuse I have no 4hi and 4 low.