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What does it mean when your battery gauge fluctuates

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Temperature gauge keeps fluctuating whats the cause


Fiats have a reputation for electrical/electronic problems as they age and even when they are not very old they can manage strange things that even sometimes defeat the dealers, though the same can be said of many modern vehicles. I used to look after a Ducato motorhome and fortunately didn't need to get involved with much electrical work - the only faults were caused by the coachbuilders rushing around and being careless and not by Fiat.

I am not sure if the temp gauge is driven by the engine management or is a traditional circuit but either way the temperature gauge is in effect a voltmeter of sorts. Assuming the gauge is ok, the reading will only fluctuate if the voltage in the circuit fluctuates and that could mean the supply voltage is fluctuating or the resistance of the ground path is fluctuating.

With the traditional circuit the gauge is supplied by an electronically stabilised voltage and the ground path resistance is varied by the engine coolant temperature sensor and fluctuations could be anything from a faulty instrument voltage regulator, through faulty wiring or connections to the temperature actually fluctuating.

If the gauge is driven by the engine management the same approximately applies but checking the circuit becomes much more complex due to the need for circuit diagrams and specialised test equipment, though these would not be needed just to check the security of the gauge in the printed circuit of the instrument panel.

Mar 18, 2017 | Fiat Cars & Trucks

3 Answers

Why does my temperature gauge keep going up and down


An accurate temperature gauge will always fluctuate because the temperature in the engine fluctuates.

Usually the only time this is really noticeable is when the engine has been working hard and suddenly has to wait at a junction or similar and the gauge can rise considerably.

You didn't mention by how much the gauge fluctuates?
As long as it remains approximately in the normal zone it is acceptable but if it climbs into the hot zone or falls into the cold zone it is not acceptable and the cause should be investigated as soon as possible.

May 02, 2016 | 2008 Peugeot 308 1.6

1 Answer

How does the gauge fuse work, because i think it doesn't work properly


Fuses have 2 states. One is closed, meaning the fuse will pass electricity the other is open which means electricity will not pass through it. There is no in between. A fluctuating fuel gauge can be caused by a bad sensor in the tank or a bad chassis ground.

Dec 21, 2015 | 1997 Toyota Corolla

1 Answer

Volt meter fluctuates in cold weather


well that is battery volts.
but id never trust that dash meter, i use a real meter, to see if the dash gauge is fibbing. see?

if it is, then we work the meter. or data to it.
if the battery varies, then the alternator system is malfing,
if the battery does not vary, but the cig lighter port varies, that is wiring issues,

fluctuations if real?
is battery is doing that or the wiring. from it.
has voltage drops. (bad wiring) along the way.
if all is good, in wiring at battery , at cig and dash,
then the gauge is bad or the PCM is sending bad data to cluster computer.
first is to scan it, scan the pcm.
got DTC errors?

Mar 08, 2015 | 2003 Jeep Grand Cherokee

1 Answer

Chevrolet suburban voltage gauge fluctuates


The rough running is the cause of the voltage gauge movement.. As the engine speed increases and decreases the voltage output of the alternator goes up and down. So the gauge is a symptom not a problem.

Feb 14, 2012 | 1994 Chevrolet Suburban

1 Answer

2005 nissan armada oil gauge


no,,, fluctuations mean =low oil pressure,oil level low,oil old or too thin viscotly,oil pump loosing or not develloping the correct pressure
pressure release valve spring weakened

Jul 06, 2010 | 2005 Nissan Armada

1 Answer

"check gages" light


the check gauges light is to tell you to look at the gauges,one of them is not in normal position,could be temp,oil pressure,charging,or gas.

Jan 12, 2010 | 1996 Jeep Grand Cherokee

2 Answers

When I am driving 2000 S-10 my battery gauge fluctuates.


My 2000 chevy s-10 starts fine and I get 14.5 on my batt. gauge.after driving it a bit it drops to 10.5 to 11.0. when I am at a stop light the batt. gauge goes to 10.5 to 11.0....When I go down the road again the batt. gauge goes back to 14.5.What could be the problem?

Dec 14, 2009 | 2000 Chevrolet S-10

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