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Old 10-15-2007, 06:56 PM   #1
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I'm Stan Frame and we have a 2002 (40') Dutch Star, Spartan, Cummins 350. I am looking for ideas on where to start to solve a peculiar problem with some of my gauges.

About 750 miles ago, I started noticing the engine coolant temp gauge shoot up about 20 degrees, then drop about 40 degrees, then shoot up, etc. all the while the red light would flash. Then the transmission gauge would do the same for a few seconds. Then all would be well for maybe 100 to 500 miles. Then, the dance would begin again for about 20 - 30 seconds and return to normal. A check showed all fluids Ok and within range.

About 120 miles back, these two gauges started their movement, but the engine oil gauge joined them! Back and forth, light blinking, for less than a minute and then all is well for perhaps 20 miles. Finally, just about 50 miles back, the speedometer and tach joined in - but in a much more reserved fashion. The speedo dropped slowly to about 40 mph and slowly returned to the constant 58 I was running (under cruise control). The tach only moved about 400 rpm (1600 to 1200), also very slowly and then returned to normal. Again, after a few minutes, all returned to normal and stayed that way until we reached our current destination.

Any ideas?
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Old 10-15-2007, 06:56 PM   #2
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I'm Stan Frame and we have a 2002 (40') Dutch Star, Spartan, Cummins 350. I am looking for ideas on where to start to solve a peculiar problem with some of my gauges.

About 750 miles ago, I started noticing the engine coolant temp gauge shoot up about 20 degrees, then drop about 40 degrees, then shoot up, etc. all the while the red light would flash. Then the transmission gauge would do the same for a few seconds. Then all would be well for maybe 100 to 500 miles. Then, the dance would begin again for about 20 - 30 seconds and return to normal. A check showed all fluids Ok and within range.

About 120 miles back, these two gauges started their movement, but the engine oil gauge joined them! Back and forth, light blinking, for less than a minute and then all is well for perhaps 20 miles. Finally, just about 50 miles back, the speedometer and tach joined in - but in a much more reserved fashion. The speedo dropped slowly to about 40 mph and slowly returned to the constant 58 I was running (under cruise control). The tach only moved about 400 rpm (1600 to 1200), also very slowly and then returned to normal. Again, after a few minutes, all returned to normal and stayed that way until we reached our current destination.

Any ideas?
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Old 10-16-2007, 02:19 AM   #3
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To; Sframe;

Check your 12 volt fuses for instrument cluster. Could be loose or corroded .

My fuses located under cover on dash above cluster.

Hope this info helps

Thanks==AIME--
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Old 10-16-2007, 04:26 AM   #4
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Welcome sframe to the Newmar forum and irv2.
Sounds like you may have a loose batt or ground connection going to instument panel. Check back of panel or a ground post or strip location for loose screw or nut. If its a electronic display could be a loose plug in back of IP also.
Let us know how your making out on checks.
Enjoy the forum and if you would like some KARMA as others have just say the word.
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Old 10-16-2007, 02:53 PM   #5
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I second that it sounds like a bad ground. If your ground is bad, very strange things happen that seem to have nothing to do with each other.
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Old 10-18-2007, 05:40 PM   #6
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Thanks for your replies. So far, I have (visually) checked all the wiring behind the gauges, in the dash area, and on both sides of the firewall. I did find one white wire that was a little loose down near the HWH box mounted on the firewall. It went up to a loom at the back of the instrument panel.

As soon as we get decent weather in Boise, ID area, I will go over all major battery connections at the rear.

Stan
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Old 10-19-2007, 09:21 AM   #7
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Stan,

There is another possibilly. Remove and replace the connectors for the VDU/VDC in the engine compartment, it has 2 air lines to it. If this makes a difference, clean them with DE-OXIT.

If none of the other suggestions resolve the problem, my bet is the connector solder joints inside the VDU/VDC are cold soldered as mine were in my 2001 DSDP.

If the gauges are still flakey, look at the VDU/VDC as the possible bad guy. There is a repair for the VDC that requires the unit bve removed and the connectors resoldered. There is a repair that I came up with for the pressure sensor problem that is in the files of the Yahoo newmarowners list. Use this as a guide re-solder the connectors instead. I always re-solder them on any VDC I repair. BG

IF you can get a Tech to talk, they will tell you the older VDCs are a problem!!
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Old 10-22-2007, 02:02 PM   #8
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OK, at this point I am too desperate to be proud. What IS VDU/VDC? Where will I look in the engine compartment and what am I looking for (physical description)?

Thanks for more excellent advice.

Stan
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