I've done some searching and find two different directions to look and not sure which way to start.
I've got a new to me 05 1500 5.7 auto, You can feel the transfer case clunk when shifted 2H-4H or any other combo but, the 4WD indicator does not come on.
I ran the Inst cluster check and get no codes but, the light doesn't come on during the test.
Where is the "CAD"?
Where do I start?
Thanks!

 

If i am not mistaken, there is a vacuum indicator on the transfer case that controls those lights, has 4 vacuum lines on it. Check them and/or the indicator. I am sure someone will correct me if i am wrong

 

Thanks for the input. I'll try and get it in the garage tomorow.

 

I am also having the same issue. just boydn1 how did you make out with yours ??

Thanks

And Thanks to anyone else who can shed some light on this for me

 

Boydn1 said he would get to it tomorrow, look at the vacum lines coming off the transfer case.
but im guessing it to be Elec since the transfercase is switching inot 4x4

 

huh... my truck has done this ever since I got it. I never worried about it since I can feel it shift into 4wd and there is a noticeable difference in driving. I can tell it is working so I never worried about it, but maybe ill check some of the wiring to see if I can find a problem.

 

Alot of people post on here with this same exact problem.

 

maybe the bulb burned out....? have you thought about that...?

I remember a friend of mine had a bitching Ford F150from 1998... with massive tires & lift and a V8...etc... and he kept failing his inspection b/c there was a trouble code (back then they weren't able to give you a failure report)

but there wasn't a check engine light on... well sure as **** we checked everything had the dealer scan it... even the dealer was like (oh the computer is fried blah blah blah)

So I said "Brian... just pull the cluster and change all the bulbs back there..." He blew me off, so I did it myself while he drank my beer (grrrr) and after I was done, I started the truck up and like Magic the CEL was now lit up...

So maybe that's your problem... happy hunting.......

 

As much as my CEL stayed on in my 4x4 Ranger im suprisied it didnt burn out lol!
Check your bulbs before you blow all your money

 

Its the switch on the transfer case. Mine did the same...the light didnt come on with the dash test either. Put a new switch in and and the dash "4WD" light comes on when in 4WD.