Hey guys I have a 2001 Dodge 2500 with the cummins.

Here is my problem. The 4X4 light will not come on when shifted into 4 wheel drive. Also the cruise control light will come on but will not engadge. I was wondering does the cruise vacume under the driverside battery tray control the 4X4 also. Because I was just under there the other day wiring up the snow plow lights. What is your take on this and where should I start?
Thank you for your help!

 

Any vacuum leak of a significant size will affect all vacuum controlled accesories,they are all tied together.

Bob

 

Thank you, thats the first thing Im going to check is the cruise control under the driver side battery box and make sure there is no disconected line there. I just wanted to make sure they did work together. Thank you

 

Either a big leak or it could also be a collapsed rubber connector somewhere, I just ran into that last weekend on a friends truck. No vacuum to anything down the line.

A vacuum gauge is very helpful in tracking down problems.

 

I cant figure mine out either. My cruise does not work...and the "cruise" light does not come on. My 4wd does not work either but I have vacuum.

 

my vacuum line was rotted out at a tee that is located at the firewall on the driver side. after fixing that it worked fine. I broke mine loose wiring the fuel pressure gauge. Ed