Strange temperature gauge issue
#3086628
10/16/22 08:14 PM
10/16/22 08:14 PM
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Joined: Nov 2006
Posts: 4,719 Star Idaho
67vertman
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OP
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Star Idaho
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79 Dodge D150, 360 CI Temperature gauge works fine, that is until you turn the lights on. Then the gauge will climb, some times it will peg others times it it goes to three quarters. Now for even more strange, when you turn the dimmer switch up, you can watch the gauge climb, turn it down the gauge will drop. Turn the lights off the gauge works normal. Truck is not over heating. I believe it is a faulty dimmer switch, but it turn the lights off and on fine and controls the dash lights. Has anyone run into this issue? potential causes and fixes???
My Monster are real!
Living within your means makes life pretty easy.
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Re: Strange temperature gauge issue
[Re: 67vertman]
#3086648
10/16/22 08:54 PM
10/16/22 08:54 PM
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Joined: Dec 2009
Posts: 20,629 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,629
in a cattle trailer down by th...
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Its a ground issue, been there done that.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon! 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Strange temperature gauge issue
[Re: Guitar Jones]
#3086689
10/16/22 10:52 PM
10/16/22 10:52 PM
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Joined: Nov 2006
Posts: 4,719 Star Idaho
67vertman
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Star Idaho
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Its a ground issue, been there done that. Ground to what GJ! in the dimmer switch it self, or the temp gauge? They both work.
My Monster are real!
Living within your means makes life pretty easy.
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Re: Strange temperature gauge issue
[Re: 67vertman]
#3086704
10/17/22 12:46 AM
10/17/22 12:46 AM
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Joined: Dec 2009
Posts: 20,629 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,629
in a cattle trailer down by th...
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Its a ground issue, been there done that. Ground to what GJ! in the dimmer switch it self, or the temp gauge? They both work. It could be any multitude of places. As these trucks age contact points between body panels get corroded and lose continuity, ground points themselves do the same. It's time to find and clean to bare metal every ground point on the truck. If that doesn't fix it then running new ground wires from body panels to the frame or directly to the battery is the next step.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon! 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Strange temperature gauge issue
[Re: Guitar Jones]
#3086753
10/17/22 09:47 AM
10/17/22 09:47 AM
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Joined: Nov 2006
Posts: 4,719 Star Idaho
67vertman
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master
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OP
master
Joined: Nov 2006
Posts: 4,719
Star Idaho
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Its a ground issue, been there done that. Ground to what GJ! in the dimmer switch it self, or the temp gauge? They both work. It could be any multitude of places. As these trucks age contact points between body panels get corroded and lose continuity, ground points themselves do the same. It's time to find and clean to bare metal every ground point on the truck. If that doesn't fix it then running new ground wires from body panels to the frame or directly to the battery is the next step. Thanks guys! I guess I have some investigation to do.
My Monster are real!
Living within your means makes life pretty easy.
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Re: Strange temperature gauge issue
[Re: 67vertman]
#3086775
10/17/22 10:22 AM
10/17/22 10:22 AM
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Joined: Jun 2005
Posts: 5,102 Western Md.
skicker
"The Champ"
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"The Champ"
Joined: Jun 2005
Posts: 5,102
Western Md.
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I installed a set of Cyberdyne aftermarket gauges in my 70 when it was built...no issues until a few years later when I installed the stereo system...
When the volume was turned up the water temp would peg and the oil pressure would drop...
A ground wire from the gauges ran to the engine and not just the dash frame cured the problem...
...FAFO...
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Re: Strange temperature gauge issue
[Re: skicker]
#3086805
10/17/22 11:07 AM
10/17/22 11:07 AM
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Joined: Jan 2003
Posts: 10,703 North Dakota
6PakBee
I Live Here
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I Live Here
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Posts: 10,703
North Dakota
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Sounds like your IVR is acting up. If you think it is a ground problem, a lot of the later IVR's have a tab on the case that does is not connected to anything. I'd run a test wire from this tab to a good gorund and see if it makes a difference. IVR
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Strange temperature gauge issue
[Re: moparx]
#3086878
10/17/22 03:03 PM
10/17/22 03:03 PM
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Joined: Nov 2006
Posts: 4,719 Star Idaho
67vertman
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grounds are funny things. can't have too many of them, and the connecting points must be clean and tight. they can also cause hair loss on the top of ones head from chasing them to find the one that is causing the problem[s] you are having. i have no hair on the top of my head. Yes, chasing electoral issues will leave a man bald!
My Monster are real!
Living within your means makes life pretty easy.
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Re: Strange temperature gauge issue
[Re: topside]
#3086879
10/17/22 03:05 PM
10/17/22 03:05 PM
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Joined: Nov 2006
Posts: 4,719 Star Idaho
67vertman
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Dial-a-temp ! Who knew ?
Sounds like it's time to pull the cluster & clean up whatever's creating the feedback. Might as well look at the bulkhead connections and grounds, too. It is pretty strange to watch, I will have to take a video of it! Yea, I see some work in my future!
My Monster are real!
Living within your means makes life pretty easy.
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Re: Strange temperature gauge issue
[Re: 67vertman]
#3086996
10/17/22 09:59 PM
10/17/22 09:59 PM
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Joined: Jan 2003
Posts: 15,304 Omaha Ne
TJP
I Live Here
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I Live Here
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Dial-a-temp ! Who knew ?
Sounds like it's time to pull the cluster & clean up whatever's creating the feedback. Might as well look at the bulkhead connections and grounds, too. It is pretty strange to watch, I will have to take a video of it! Yea, I see some work in my future! If you can establish a grounding point on the printed circuit film ( usually under one of more screws) running a wire from one of thes points to the dash frame is a quick fix. most of the time tightening the screws (cluster mounting included) will do the trick
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Re: Strange temperature gauge issue
[Re: TJP]
#3087008
10/17/22 10:32 PM
10/17/22 10:32 PM
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Joined: Nov 2006
Posts: 4,719 Star Idaho
67vertman
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master
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OP
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Joined: Nov 2006
Posts: 4,719
Star Idaho
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Dial-a-temp ! Who knew ?
Sounds like it's time to pull the cluster & clean up whatever's creating the feedback. Might as well look at the bulkhead connections and grounds, too. It is pretty strange to watch, I will have to take a video of it! Yea, I see some work in my future! If you can establish a grounding point on the printed circuit film ( usually under one of more screws) running a wire from one of thes points to the dash frame is a quick fix. most of the time tightening the screws (cluster mounting included) will do the trick Thanks for the "Tip"
My Monster are real!
Living within your means makes life pretty easy.
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Re: Strange temperature gauge issue
[Re: 67vertman]
#3087555
10/19/22 06:10 PM
10/19/22 06:10 PM
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Joined: Nov 2006
Posts: 4,719 Star Idaho
67vertman
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Star Idaho
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All right, an update after some investigation. I pulled the instrument cluster and cleaned all the contact points that I could access, I found one burned out bulb, emergency brake light. I also checked the bulkhead connector, it was tight with no loose wires. The issues was better, but still there. As I was putting the ground back on the battery, I told myself to check all the ground to vehicle connection, the very first one was battery to engine. At first it look good, but I decided to pull it off and clean the surfaces. Upon loosing the bolt just a little, the cable fell off. The end connector was broken in two places. I put a new end connector on. I found one other body ground from body to transmission with a bad end as well. Cleaned all other grounds I could find, I fixed a bunch of wiring connections from previous owners, trailer brakes (wired with Romex wire), stereo and trailer plug that were only held together with twist ends and electrical tape! For now the issues has gone away and the seat belt indicator buzzer has decide to work, but will probably get unplugged soon. Thanks for all the help!
My Monster are real!
Living within your means makes life pretty easy.
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Re: Strange temperature gauge issue
[Re: 67vertman]
#3087563
10/19/22 06:31 PM
10/19/22 06:31 PM
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Joined: Dec 2009
Posts: 20,629 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,629
in a cattle trailer down by th...
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See I told ya!
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon! 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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