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#1
07-10-2007, 10:11 PM
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temp/fuel gages bounce, as speed increases
I just replaced my dash last week, and have not driven the car much (300TD) until today... and after a couple of miles the tempature gage started to bounce, and ended up pointing to hot (high resistance) The fuel gage did the same, so it seems as if I must have tweeked something?
How is it that the instrument cluster is grounded? May be that is my problem, as even when it is misbehaving, it will flicker to the 'correct' setting about once every time the wheels turn, the faster I go, the more it bounces... any suggestions? or thoughts as to where to start?
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46 WDX Power Wagon 84 300TDT daily driver 
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#2
07-10-2007, 10:25 PM
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In back of the instrument cluster are two grounding nuts with several ground wires to each, check that. All the little screws between the three parts of the cluster transfer the ground so they need too be good and tight. I have attached a new ground to the back of a cluster and that has stopped the "jumps" when all else had failed.
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 1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car"
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#3
07-10-2007, 10:29 PM
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That does sound like a ground problem. The ground is one of the connections on the round connector (brown wire). I had a similar problem on my 240D and solved it by running a separate ground wire from the cluster (metal frame) to the ground point under the dash (bolt with lots of brown wires connected to it).
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#5
07-11-2007, 01:13 AM
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Yeah what they said: ground problems. The fuel and coolant temp gauge share the same ground. If after tightening the grounds behind the cluster and you still have problems, take a look at the 2 related threads below:
Engine won't crank Stranded. instrument cluster issue in 2007 The problems I had happened over a 2 day period. Everything was fine before that. Basically I had loose and missing starter motor and engine bell housing bolts, which led to a no start, then weird problems with the fuel and coolant temp gauges followed (see post #17 onward in second thread)
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked Last edited by funola; 07-11-2007 at 01:24 AM.
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#6
07-17-2007, 08:35 PM
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I probably should'nt be asking questions like this, but how do you access the back of the instrument cluster to check those ground leads!?
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82 300TD wagon, odometer stopped (Jan 07) at 255k. Big AT tires on the back, cruising CA coast Hwy 1 and Big Sur mountain roads. Running on B99. Wish she was a stick shift. 97 RAM2500 Cummins affair. Big longass lifted biodiesel thing. Too big. Too spendy - got rid of it. Sure could pull some weight though.
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#7
07-17-2007, 08:42 PM
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OK, think I got it here: http://dieselgiant.com/repairyourodometer.htm
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82 300TD wagon, odometer stopped (Jan 07) at 255k. Big AT tires on the back, cruising CA coast Hwy 1 and Big Sur mountain roads. Running on B99. Wish she was a stick shift. 97 RAM2500 Cummins affair. Big longass lifted biodiesel thing. Too big. Too spendy - got rid of it. Sure could pull some weight though.
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#8
07-17-2007, 10:41 PM
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Hey! I found a nice big short in the ground circut board tracer, er what do you call those lines in the circut board.... anyway, I soddered it to the best of my ability and it fixed the bouncing gage trouble.. Thanks for your help fellas, I am usually leary of electricity, but this was not so bad after all...
jason
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46 WDX Power Wagon 84 300TDT daily driver
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#9
07-17-2007, 11:40 PM
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Good job.
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#10
07-17-2007, 11:45 PM
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You found a short or an open? I'd think it's an open, unless you are calling an open a short. Did you take a pic? I wonder if its the same trace that burned on mine which had similar symptoms as yours (jumpy fuel and coolant temp needle). When I take my cluster out next time, I will trace out the circuit and take a pic.
Quote:
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked
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#12
07-19-2007, 03:57 PM
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heh, an open short, or a short open? maybe follow the trace and see where it goes and see what would draw current and pop it.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#14
12-13-2007, 11:08 PM
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Now,
I have been having the same problem with my gage cluster except that the bouncing only ocurrs when the headlight are on?  I already checked the grounding nuts and the cluster bolts and everything is tight. I am puzzled 
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------------------------------------------ Aquilae non capunt muscas! (Eagles don't hunt flies!) 1979 300SD Black/Black MBtex239000mi 1983 300TD euro-NA. White/Olive Cloth-MBtex 201000mi. Fleet car of the USA embassy in Morocco 1983 240D Labrador Blue/Blue MBtex 161000mi
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#15
12-13-2007, 11:53 PM
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Bad ground somewhere?? (realize that i dont know much about electricity)...
Or is it the dashboard light circut that is causing the ground problems.. what if you turn your rheostat down until the instrument lights go off, does that change anything???
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46 WDX Power Wagon 84 300TDT daily driver
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