2006 Monaco Dynasty gauge problem

[Nbrad53]

Hi there, I’m suddenly having issues with the gauges on my 2006 Monaco Dynasty Diamond IV. All the gauges EXCEPT the fuel and air gauges are sweeping constantly and I’ve got check engine, engine comm. failure, trans comm. failure, and check trans light. I will say this issue started after engine batteries dying and jump starting the coach. Coach batteries were only 13 months old, but a defective big boy solenoid in the RRB caused them to die. I replaced big boy and chassis batteries for peace of mind. I have spent countless hours looking for the obvious, and not so obvious. What is interesting is my Aladdin is still showing all engine parameters correctly, RPM, speed, boost, oil pressure, voltage, etc. I also drove the coach 40 or so miles at highway speeds in order to get it home and it drove normally, but the gauges did this the whole way home. I’ve taken basement ceiling panels down and tried to trace broken wires or burnt fuses to no avail. Though I did find mouse evidence I did not find any chewed wires. I’ve also checked all fuses and connections in both the front run box, and rear run box. Has anyone else had this problem on a similar year Monaco/HR/Beaver?? Any and all suggestions appreciated!

[Jzack]

Hopefully others who have had this problem will chime in. That said, whenever there are multiple, seemingly unrelated electrical issues, the problem is almost always a bad ground connection. I'd start looking at all the connections that were last touched.

[153stars]

Monaco has ground bus bar front firewall over genny. More than one member ran a new ground to dash.

[Nbrad53]

Thanks for the replies, I have tried cleaning grounds, another hard reset of all systems (coach house, and chassis systems all disconnected for more than 20 mins) and also tried adding another large ground wire to the ground wire going into the gauges. I even ordered a new (used) Actia master speedometer gauge thinking this may have been my issue. Still no dice. Supposed to leave for a 10 hour trip across mountain passes in Wa state next week. Starting to get frustrated now. I’ve traced wires for many hours and found no breaks or corrosion. I have not been able to locate any more J1939 Deutsch connections other than one directly behind instrument cluster, and one in the center bay ceiling. Both were tight with no corrosion. Is there more near the engine? I wouldn’t think the Aladdin would be displaying engine and trans parameters if there was an ECU connection problem? Someone else out there with an 06 Monaco has to have had this same issue…

[Ktmarquardt]

Did you resolve your issue? Ive began having a similar issue to yours

[jacwjames]

X2 on the grounds. Monaco daisy chained the grounds from one gauge to the other so it could be one causing the problem.

[Chargerman]

Post over at monacoers.org Some very knowledgeable and talented folks there that know Monaco’s extremely well