I have the same problem with my 02 Windsor it will read about 20 degrees hotter with the headlights on. I use the scan gauge to monitor my water temp, since the temp gauge is the only one affected I just live with it. But like others have said more than likely the root cause is a ground issue.
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Same issue on my 04 Holiday Rambler Imperial. 20+ degrees warmer with headlights on. Seemed initially to be during rain storms when I would turn headlights on, however it has turned out that anytime the headlights are on, the dash gauge shows hotter. As others have mentioned, I have learned to go by what my Alladin is showing instead of the dash gauge as I gave up looking for the cause.
Ed
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2004 Holiday Rambler Imperial 38PKD Cummins ISL400
2002 Jeep Grand Cherokee Laredo 4WD TOAD
2019 Ford Flex TOAD
I had the same problem, high temp with headlights on and tracked it down to a difference in the ground potential between the instrument panel and the negative buss in the front power panel. That gave me two possible solutions 1) track down where in the harness the bad ground was or 2) run a new clean ground from the ground post in the front power panel to the instrument panel. After some digging through the harness I went with option 2 and ran a new ground from the ground post to the negative side of one of the gauges. This fixed the problem no more bad readings with the lights on and running the new wire was easy. Hope this helps some of you guys out.
8.3Oilbuner, 153stars, Mark, Ed, alounsbe, JimWW and everyone: thank you so much for your comments and suggestions.
I was actually considering the same two solutions of alounsbe and glad to read option 2 worked for him. Like alounsbe, I am going to run another ground wire from the firewall ground bus bar to negative side of Temp gauge and update you with the results.
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Ali & Shannon
2000 Monaco Windsor 40 PBS
I have the same issue on our 97 Dynasty. I know if you turn the bright dim for dash lights you can see the temp go down to where it was. I just haven’t had the time to fully troubleshoot it but I think it’s a poor ground issue as well as others have said.
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95 Dynasty 36
97 Dynasty 40 original to the family
... Like alounsbe, I am going to run another ground wire from the firewall ground bus bar to negative side of Temp gauge and update you with the results.
Success no more dash gauge fluctuations with headlights after pulling a good ground from firewall ground busbar.
Thank you all for your help
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Ali & Shannon
2000 Monaco Windsor 40 PBS
no more dash gauge fluctuations with headlights after pulling a good ground from firewall ground busbar.
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