Met our Canadian Snowbird friends for dinner this evening. They will tour Florida for most of November and we will meet them again at Thanksgiving at the CG. It is great to see them again.
I am asking this question for them. He has a 2005 or 6 HR Neptune with a 300HP Cummins and a 5-speed Allison Trannie. While driving his Tach will go to zero or oscillate between the engine RPM and some lower value. There is no change in engine RPM when this happens. He has had it to the Dealer and Wildwood Service Center and naturally it did not fail for them. The coach is running well. While it could be anything from a corroded/loose connector to a failing sensor, I will greatly appreciate your input.
We are going to look at it when we meet in FL and I would like to go armed and will appreciate your answers to the following (and anything else you think I should know):
1. Is the sensor in the engine or the transmission (where do we look for the sensor)?
2. Is the sensor prone to intermittent failure?
3. Is the Tach Gauge fed directly from the sensor or is it fed from the ECM?
4. Do you know of any measurement checkpoints to help isolate the problem?
It should be obvious that he does not have a chassis or coach wiring diagram and has not been successful getting them from Monaco.
Any help you provide such as sensor description, location, etc. will be appreciated. It would be a stroke of luck if we could come across a wiring diagram. Appreciate your help on this.
I know that upon reading this you are either taking a deep breath and saying "Oh my God" are laughing hysterically. Both Cory and I have always worked under the assumption that it doesn't cost much more for someone to fix our mistakes (if we make any) than to fix the original problem and we have so much fun doing it, learn a lot from the experience and often times save a peck of cash.