moxy1962 Posted November 10, 2021 Share Posted November 10, 2021 (edited) Has anyone figured out the fix for sure ? Edited November 10, 2021 by moxy1962 Link to comment Share on other sites More sharing options...
Nancy Knaus Posted November 10, 2021 Share Posted November 10, 2021 I unplugged it under the dash cover for a day. It fixed it self Link to comment Share on other sites More sharing options...
moxy1962 Posted November 10, 2021 Author Share Posted November 10, 2021 Unplugged what may I ask Link to comment Share on other sites More sharing options...
PeterSchweizer Posted November 10, 2021 Share Posted November 10, 2021 Possably a bad ground on the back of gauges. Monaco daisey chained the grounds from one gauge to the next to the next... then to a ground. Open dash/instrument panel and check for loose connections at each gauge follow the ground wires. ( I think its a white wire?) you can also ADD a new ground wire to each to a new good ground to eliminate it being the issue. NOTE: best if you turn off both chassis and coach main battery disconnects when fiddeling around behind the instument panel. Dont ask me how I know ask otheres how they learned as i always turn orr or disconnect power. Link to comment Share on other sites More sharing options...
Nancy Knaus Posted November 10, 2021 Share Posted November 10, 2021 I'm sorry I can't remember, It was under the cover on the dash of our 2010 Dipomat. I'll have to get back to you later, as I'm not home right now. I think we unplugged everything that was unpluggable Link to comment Share on other sites More sharing options...
jimc99999 Posted November 10, 2021 Share Posted November 10, 2021 My bouncing tach was a precursor to alternator failure. On my 97 Windsor the tach signal comes from the alternator. 1 Link to comment Share on other sites More sharing options...
Robert U Posted November 10, 2021 Share Posted November 10, 2021 I have a 2000 Dip and finally fixed the speedometer from being all over the place. On the back of the gauge there is a black pot with a screw driver slot. I marked the position of the slot. I then used a screwdriver to turn the pot back and forth to clean the variable resister. Speedo has now been working great for a year. Also the tach has a variable pot on back which also cleaned by moving it back and fourth. Bob U 2000 Dip 1 1 Link to comment Share on other sites More sharing options...
moxy1962 Posted November 10, 2021 Author Share Posted November 10, 2021 32 minutes ago, jimc99999 said: My bouncing tach was a precursor to alternator failure. On my 97 Windsor the tach signal comes from the alternator. New alternator or old still bouncing Link to comment Share on other sites More sharing options...
PeterSchweizer Posted November 10, 2021 Share Posted November 10, 2021 ALL Its not just the tach thats an issue its also the speedometer - 2 seperate items and 2 seperate information feeds to the gauges. However what is common to both is the ground circuit or harness/connector issue 1 Link to comment Share on other sites More sharing options...
Robert U Posted November 11, 2021 Share Posted November 11, 2021 It would be nice to know what motorhome year and model we are discussing here. Bob U 2000 Dip Link to comment Share on other sites More sharing options...
moxy1962 Posted November 11, 2021 Author Share Posted November 11, 2021 3 minutes ago, Robert U said: It would be nice to know what motorhome year and model we are discussing here. Bob U 2000 Dip 2002 dynasty chancellor Link to comment Share on other sites More sharing options...
RoadTripper2084 Posted November 11, 2021 Share Posted November 11, 2021 Mine has both issues as well, '97 Dynasty. Planning on rebuilding my alternator as it makes a sound on each rotation when I hand-spin it. Seems to be working okay though, for now. I also suspect grounding issue, will have to open the dash and try the suggested fixes, just not looking forward to it as all my dash plastic is broken around all the screws. Maybe I could glue the pieces back on while I have it out? Link to comment Share on other sites More sharing options...
Mary & Glenn Posted November 12, 2021 Share Posted November 12, 2021 When we bought our 2000 Dynasty in 2013 the fuel gauge didn't work. The spedo would vary some initially and it progressively got worse to the point that it is a joke. Also, whoever at Monaco designed the dashboard, at least for the 2000 model year, never bothered to sit behind the wheel and attempt to look at the gauges. They are almost impossible to see without leaning forward. I solved the problem right away by installing a Silverleaf interface to the CAN interface of the engine and transmission and put a small laptop in a spot that doesn't impair my view but gives me everything I need to know from the dash and a whole lot more. It is a bit of a project to determine what is best for situation to place the laptop but well worth the effort. This is an old picture to show the install. My laptop gauge setup is quite a bit different now. Link to comment Share on other sites More sharing options...
moxy1962 Posted November 12, 2021 Author Share Posted November 12, 2021 14 minutes ago, Mary & Glenn said: When we bought our 2000 Dynasty in 2013 the fuel gauge didn't work. The spedo would vary some initially and it progressively got worse to the point that it is a joke. Also, whoever at Monaco designed the dashboard, at least for the 2000 model year, never bothered to sit behind the wheel and attempt to look at the gauges. They are almost impossible to see without leaning forward. I solved the problem right away by installing a Silverleaf interface to the CAN interface of the engine and transmission and put a small laptop in a spot that doesn't impair my view but gives me everything I need to know from the dash and a whole lot more. It is a bit of a project to determine what is best for situation to place the laptop but well worth the effort. This is an old picture to show the install. My laptop gauge setup is quite a bit different now. Not looking to to go quite that elaborate but thanks for the Suggestion, I can see the gauges fine, need them to be accurate Link to comment Share on other sites More sharing options...
moxy1962 Posted November 13, 2021 Author Share Posted November 13, 2021 On 11/10/2021 at 3:16 PM, Robert U said: I have a 2000 Dip and finally fixed the speedometer from being all over the place. On the back of the gauge there is a black pot with a screw driver slot. I marked the position of the slot. I then used a screwdriver to turn the pot back and forth to clean the variable resister. Speedo has now been working great for a year. Also the tach has a variable pot on back which also cleaned by moving it back and fourth. Bob U 2000 Dip Nailed it, that was easy, tach and Speedo working perfect thanks for the fix Bill Link to comment Share on other sites More sharing options...
BigNick Posted November 20, 2021 Share Posted November 20, 2021 I wonder if the Tach has a vari pot as well? Link to comment Share on other sites More sharing options...
moxy1962 Posted November 20, 2021 Author Share Posted November 20, 2021 It does yes Link to comment Share on other sites More sharing options...
BigNick Posted November 20, 2021 Share Posted November 20, 2021 1 minute ago, moxy1962 said: It does yes Thank you, mine bounces just a bit, I'll mark it, exercise the pot and call it good. Link to comment Share on other sites More sharing options...
moxy1962 Posted November 20, 2021 Author Share Posted November 20, 2021 23 minutes ago, BigNick said: Thank you, mine bounces just a bit, I'll mark it, exercise the pot and call it good. Worked for me, good luck Link to comment Share on other sites More sharing options...
whaley96raw Posted November 23, 2021 Share Posted November 23, 2021 The tach in my 2006 Monaco Cayman bounced erratically until a mechanic with common sense tightened the nut where the cable entered the back of the tachometer. Link to comment Share on other sites More sharing options...
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