Monaco Cayman will not turn over

[Don Alan]

2008 Monaco Cayman 6.7 liter diesel pusher with Cummins/Allison2500 ( pickup truck motor ).Thursday traveled 6 hours to a race track and parked. Sunday evening traveled 2.5 hours on the return trip, stopped at Cracker Barrell for dinner which I turned key to stop engine (Dogs). Returned very quickly 25 minutes later, engine would not turn over. All dash lights seemed normal. Waited approximately 2 hours.....it started up. Drove another 3 hours to home. Turned off engine in driveway and restarted hot. Went to bed. Next morning started up cold, drove to our lake house to park inside a building. Has not started since with key. Check all fuses and relays all test good. I can crank engine by jump the starter with a screw diver at the starter. So I replaced the ignition switch. ($28). NO LUCK. i wanted to go to the race track with MH and trailer, so I jumped starter with screw driver, let warm up...... then I discovered MH would not pull up incline as usual. Reverse seems to have normal power but not DRIVE ! Any help would be thankful, Don.

I have owned a Monaco Signature 500 HP Cummins,4000 Allison, but this is a little smaller motor, starter and relays.

[Skip426]

Welcome to iRV2.

Sorry your first is about problems .

You 2500 series Allison also has different controls the the 3000/4000 series that your used to .
Some years of the 2500 using the Arens SBW ( Shift By Wire ) also have an Allison NSBU ( Neutral Start Back Up ) module , between the electronic shift motor and the transmission that can be an issue as it provides a ground circuit to the starter relay ( the relay is different that the solenoid on the starter ) .I've replaced 2 starter relays for erratic no crank condition.
So important to find and test yours ; during the no crank condition.

Contact Freightliner with your serial number for wiring schematics and diagrams for your chassis . Once you have them treat them like gold .
1-800-385-4357

A quick read of my post on the Arens shifter issues could prove enlightening too. I'm trying to link all the shifter relater issues together.

http://www.irv2.com/forums/f125/2100...on-490151.html

[Don Alan]

2008 Monaco Cayman Road Master chassis

[Don Alan]

Replaced starter.......no start. Found ignition relay in back curb side compartment and swap exhaust brake relay with ignition relay ( I heard the transmission module " fire up" as soon as I plugged working relay in ) and it started right up. Not sure if I had a bad starter that effective the relay ?