In using this forums resources I have found that there is very little, if any, documentation, such as wiring diagrams AC and DC, plumbing and the like, specific to my model year 1999. Much exist for earlier and later models and I have successfully used them in trouble shooting issues. Every diagram I have reviewed, even those I received from BAC, do not specify the 1999 year model. Was there something going on at Beaver at that time that resulted in limited availability of supporting documents? If anyone has documentation specific to a 1999 Beaver Marquis Jasper (or any 1999 Marquis) w/cat c12 I would love to include them in my Beaver file. I do have the basic owners manual, manuals for the various options, the original marketing brochure, magnum chassis manual but no "diagrams" of any of the systems. I have collected "diagrams" from earlier and later models but I have found there are similarities but just enough difference to totally confuse this amateur do-it-yourself motor home repairman.