4x4 not working
Lead Driver
Joined: Jul 2004
Posts: 6,950
Likes: 510
From: Foothills, CA
I'll bow out as the others here know more about this than me -- I'm becoming an expert on a '97 F150 4x4 system pretty quick tho.... Friend's boyfriend split and her 4x4 just stopped working
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Elder User
Joined: Jul 2013
Posts: 623
Likes: 0
From: Tuttle, OK
You know, again I don't know if our SD system has a vacuum actuator at the Diff (my truck is not here to check), or if it's vacuum at the hubs to engage them. You'd know if you replaced the hubs. But if it's the latter (@ hubs) and you manually engage the hubs and DON'T get a turning front drive shaft, there's more than one thing wrong.
I'll bow out as the others here know more about this than me -- I'm becoming an expert on a '97 F150 4x4 system pretty quick tho.... Friend's boyfriend split and her 4x4 just stopped working
I'll bow out as the others here know more about this than me -- I'm becoming an expert on a '97 F150 4x4 system pretty quick tho.... Friend's boyfriend split and her 4x4 just stopped working
Fleet Owner
Joined: Nov 2003
Posts: 27,894
Likes: 3,613
The service manual discusses electronics under the hood that control the engagement of the transfer case (motor on the side of the transfer case). Check the two relays by the drivers side battery . They are in a small box 1.5"x3". They are for the shift motor. You can spray some contact cleaner in the plugs to get any gunk or oxidation out.
Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
The service manual discusses electronics under the hood that control the engagement of the transfer case (motor on the side of the transfer case). Check the two relays by the drivers side battery . They are in a small box 1.5"x3". They are for the shift motor. You can spray some contact cleaner in the plugs to get any gunk or oxidation out.
Posting Guru
Joined: Dec 2012
Posts: 2,169
Likes: 3
From: SW Florida
Here's some more reading material.... DChamberlain had some good diagnostic testing tips.
https://www.ford-trucks.com/forums/1...50-diesel.html
https://www.ford-trucks.com/forums/1...50-diesel.html
Lead Driver
Joined: Jul 2004
Posts: 6,950
Likes: 510
From: Foothills, CA
If that was meant for me: I'm down to the xfer case shift actuator motor or the GEM module that controls the whole shebang -- have to get together with her this weekend to figure out which (it'll help that I'll have my multimeter this time 
). Front end all works fine -- it's in the xfer case and I'm betting the motor itself -- $100 or less for that and a few bolts... (plus a few beers for me) 
). Front end all works fine -- it's in the xfer case and I'm betting the motor itself -- $100 or less for that and a few bolts... (plus a few beers for me)
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Senior User
Joined: Oct 2013
Posts: 206
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From: Sandyville Wv
If that was meant for me: I'm down to the xfer case shift actuator motor or the GEM module that controls the whole shebang -- have to get together with her this weekend to figure out which (it'll help that I'll have my multimeter this time ). Front end all works fine -- it's in the xfer case and I'm betting the motor itself -- $100 or less for that and a few bolts... (plus a few beers for me)
). Front end all works fine -- it's in the xfer case and I'm betting the motor itself -- $100 or less for that and a few bolts... (plus a few beers for me) i never thought about that.. always thinking out of the box!
glad you dialed in on it!
Senior User
Joined: Oct 2013
Posts: 206
Likes: 0
From: Sandyville Wv
keep me posted!
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Elder User
Joined: Jul 2013
Posts: 623
Likes: 0
From: Tuttle, OK
So today I made some progress. I pulled the skid plate, and unpluged the 2 wire plug on the bottom of the TC. Key on, 4x4 switch on and no power at the plug. I put 12v to the motor and heard it kick in and engage. Looked at the dash and the 4x4 and LOW lights were on. So I reverse polarity on the motor and disengaged it. So I know the TC shift motor (or whatever you call it) is working and thats all the time I had.
Nice to have a 2 post lift for this stuff.
So what do I check next, the switch?
Nice to have a 2 post lift for this stuff.
So what do I check next, the switch?
