fcooper wrote:
Even with the chassis battery switch off, there are small loads on the battery from several computers on your coach. The most likely problem is that your batteries are low. Check the battery voltage with a meter at the batteries.
I'd try jumping with jumper cables, and allow some time for the chassis batteries to receive a charge before trying to crank.
Since you mention "XC Chassis", I am assuming that your coach is on a Freightliner chassis. You can get free help and possibly a wiring diagram from the Freightliner help desk (1 800 FTL HELP). Have the last 6 digits of your vin number available before you call.
Fred
X-2 They sent me the wiring diagram.