4x4 Generic Electronic Module

[smileyr8a]

The solenoids appear to be working as they should.What us the double click that you hear in the dash after you put the truck into 4x4. I am hearing this clicking and seeing the 4x4 light on the dash just before i start to hear the front diff try to lock up.Is there some kind of solenoid or switch inside the dash that may be malfunctioning?

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[kingfish51]

Only things in the dash related to 4x4 is the rotary switch if ESOF, and the GEM module. There will be fuses/relays in the fuse box.

[smileyr8a]

the solenoids seem to be working hard to tell you shift to 4 wheel it goes to 4 wheel you shift to 2 wheel it goes to 2 wheel. the problem is that as you drive in 2 wheel drive you hear the double click in the dash of the truck as the 4x4 light comes on and trys to engage the front diff i assume.if you shift the truck into 4 wheel drive the dif engages and the noise stops and the truck goes into 4 wheel drive as needed,the problem being i didn't want to put it into 4 wheel in the first place.What is the clicking noise that you hear in the dash as you wait that few moments from when you pull the shifter into 4 wheel and it actually goes into 4 wheel drive. Is this some switch up in the dash that could cause a problem.Remember the truck goes into 4 wheel and out of 4 wheel fine the problem is the truck seems to want to go into 4 wheel drive all on its own.Your answers are great but not addressing what is really happening in my case.Maybe this is something nobody has had happen to before.Sorry for being a pest.

[smileyr8a]

I may have figured this problem out....the 4 wheel drive indicator switch on th e transfer case may be sending a bad signal to the 4 wheel drive vacuum solenoids that activates the front diff fork that puts the truck into 4x4.I put the truck in 2 wheel drive and unplugged the electical connections on the solenoids and the vaccum held no 4x4 engaging problem.Am going to change the switch($50+canadian)and see if this fixes the problem if not solenoids next ($150+).Let you know if this works,getting this problem narrowed down.Later.

[KCKITZ]

kingfish51....question....99 f150 xlt 4wd 4.6 maunal trans and manual 4wd shift. Ive switched the vaccume hose down on the vaccume motor and I can get the thing to engage.....I cant understand if when u switch from 4wd out to 4wd in... is the vaccume suppose to switch or what.? Do those solenoids on the firewall by the battery go bad..? I get voltage there but it doent change when I do the in/out switching of 4wd. I did blow out the vac. lines...there not plugged. Is there any relays to check or fuses....Thanks for the help....If u can.