2003 W900 Cab swap

Yes the cab side will be the same. 2008 up you will need to swap pins 11 and 21 to work with 6nz fan.

 

I would make sure kenworth never went to multiplex wiring. That could turn it into a nightmare and big $$$. I would think you could do the the mega cab kit and redo your wiring and interior for less money than changing cabs. But then I'm not 6'7" crammed into a k-w lol. I'm assuming you want one of those ext cab/sleeper with the 24" space with the windows and the raised roof. Hard on the eyes imo

 

Thays where they use single wires for multiple power sources. I've only read about it. International uses it as far as i know. Somehow they break up the electricity so they can power up different things. Its a way to save money and wiring afaik. A real mechanic could give you a better answer

 

220 wheelbase should have enough room for a small bunk. 36" would be better yet. The real issue would be that i dont think k-w put a big sleeper opening on their modular sleepers. I could ne wrong though its been years since I've seen the inside of a w-9 with a modular sleeper. My 88 t-6 had a small opening and the seat was always against the cab and I'm barely 6' tall. I has Pete seats in it because the back was nice and thin so the seat could go back further.i used to joke that i felt like a pregnant women cause id have my left leg stretched out to the fuse panel and my right leg ####ed over to that big fuel pedal and resting against the dash lol. Pete's have the big opening so the seat can be slid back into the opening enough to give lots of leg room.

 

Multiplex systems are basically a system where everything electronic (gauges, modules etc) communicate between each other over a common, 2 wire network. Without getting too much in depth, information is thrown out on the network at a very high speed and whatever device requires that information will pick it up (ie engine RPM will be displayed on the tach but the information from that same sensor will also be utilized by the ECU and possibly by some type of aftermarket PTO systems as well). The main reason for going multiplexed is reduced wiring and making it easier to add additional equipment.

 

My 04 Star has the multi-plex. From on o/o point of view it's a sucky system because you can't do much with it if you have problems. My pyro quit and I ended up just putting in a complete separate after market one. (I bought a new factory gauge first, and it didn't work. Wasted money, because being electrical, no return).