06 western star with series 60 not starting

Sounds like a control module isn't powering up or lost its ground. Sometimes there are power/ground wires and fuses in the battery box. Did you check those too?

 

Typically ECMs are pretty well bulletproof. They do fail but not nearly as often as one would think.

I haven't touched a Star in quite awhile but I seem to recall the gauges are all multiplexed to the datalink in the 2006's. So if ECM isn't powering up or there's a break in the datalink, it wouldn't read (and neither would the DataStar).

 

My rig has a rubber jacketed fuse holder mounted under the battery box. It took some searching to find it one day when corrosion ate the fuse causing a similar issue. Every other one I had seen was inside the battery box, but not this one. It was tucked up in a wire bundle and not easily seen.

 

My battery box was built by the car hauler manufacturer who built my rig, so the fuse placement may be different than yours. Mine was up behind the battery box towards the frame rail.

 

Nuetral jumper cables on batteries?

 

What does it do cranks but wont start? If so check to see if you have a 2 wire crank sensor. Clean it and clean the hole with magnet and leave shim out if it doesn't hit reluctor wheel. I've also seen on the older ones one tooth broken on the fuel transfer pump.