Good day my son just bought a 97 f150 4x4 5.4 and the 4x4 does not work.
Been looking around for a in detailed how to test each part to narrow down
the problem. We have a oem meter to test things, just need to now the
numbers and what wires to check it with.

 

https://www.ford-trucks.com/forums/9...97-2003-a.html

 

Is it the manual shifting 4x4, I recently had similar problems and found the problem to be the linkage going from the shifter to the transfer case was simply disconnected. Might be something as simple as that, people sometimes look for the most complicated things first though.

 

SAMS link references a manual floor shift for the transfer case. If you have a **** on the dash for 2H- 4H- 4L , then the transfer case has an electric motor .. to see if it is engaged, see if the front drive shaft moves when you move the truck. ....... front axle VACUUM engage is common setup.

 

It is a switch on the dash. I do not get a 4x4 light and do not hear any noises that it is engaging.
I'm trying to search for the info to checking all parts of the 4x4 system to narrow it down to what
it is. I have a 98 f150 4x4 will all the parts off that one fit on the 97 f150 4x4. The 98 has a 4.6
motor the 97 has a 5.4 motor.

 

when you move the switch, the electric motor on the transfer case turns the internal shaft and the gears move from 2 H- 4L- 4H .... as you select. The dash light turns on when the "shaft" moves to the 4 x 4 end of travel.. there is a switch on the side of the transfer case............. you can remove the electric motor, leave the electric cable connected, set the unit on a bucket under the truck, move the dash **** and watch it move.. Could be bad motor, could be no power to the motor, could be stuck inside.. you can move the internal shaft manually after the elect motor is removed.

 

If you click on the link I provided it tells you exactly how to trouble shoot the 4X4 system. It isn't going to fix itself, you will have to read, learn, and understand the system then physically diagnose the vehicle.

Did you check the fuse?

 

http://www.justanswer.com/uploads/ch...185629_fb3.gif

Fuse 20 is good but when tested by a test light it does not power the light.
__________________

 

When we switch the switch to 4 high or low there are no noise of any kind what so ever, no 4x4 light on the dash. Checked all fuses all work sept the fuse 20 under the dash.

 

Did you jumper across the switch to see if the switch is dead?
Or did you take it out to see if it is disconnected?
Your link doesn't work so I don't know what you are looking at. If you don't have an owners manual you can download one from here:
http://www.fleet.ford.com/partsandse...owner-manuals/
because since you didn't bother to read the first link I posted
you are looking at the wrong fuse(s).

 

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We did read your post. We checked all the fuses, the only one that does not light up
the tester is number 20 fuse. which is PCM GEM and CTM fuse. If I just turn the key
to on position no 4x4 indicator. But when I start it the indicator shows 4x4 low for a few
seconds.

 

Here is a link to your owners manual
http://www.fordservicecontent.com/Fo.../97f12og1e.pdf

 

Position Amps Description
9 - Not used
10 - Not used
11 30 Wiper system
12 5 On-board diagnostic (OBD II) data link
connector
13 15 Brake ON/OFF switch, rear anti-lock brake
module and brake pressure switch
14 15 Interior lamps and accessory delay relay
15 5 GEM module/CTM module
16 20 High beam headlamps
17 - Not used
18 5 Instrument illumination
19 10 Air bag diagnostic monitor, instrument cluster
20 5 GEM module/CTM module and powertrain
control module (PCM)

 

Number 20 fuse good but with the truck off or on but does not light up the
tester:

20 5 GEM module/CTM module and powertrain
control module (PCM)

 

Your going to have to settle down and not fly all over the place and I will try to help you.
Fuse #17 a 30 amp fuse in a 97 truck is the power source to the transfer case motor.
Look in the engine bay distribution box for the fuse.
Is it blown?
Is there power to the hot side of the fuse as the beginning?
One step at a time.

Good luck.