voltage gauge drops to zero check gauge light comes on - Dakota Durango Forum
4.7L/4.7L HO/4.7L Gen II Engines Questions regarding the 4.7L V8 engine

 
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post #1 of 15 Old 09-14-2009, 05:56 AM Thread Starter
dakqc47
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voltage gauge drops to zero check gauge light comes on

ok so it stopped raining here and i have been driving all week today go out driving and the check gauge light comes on. look around all gauges except the voltage gauge work fine. voltage reads zero but the truck runs lights start to flicker a little but it runs fine. shut the truck off restart the gauge works until 30mph or around a constant 2500 rpm about 30sec then it starts a slow drop off and the light comes on. used a multi meter (volt meter) on the batt reads around 13 volts with the truck running went from single wire on the alt to the neg side of the batt reads a pretty much constant 13 volts when i rev maybe a little flicker higher. with the volt meter dropped off. so really there is no change except the gauge. any body got an idea better than my cluster is about to dump on me? you guys helped alot in the past, lets see if it can happen again! please

oh i searched the problem and all i got in the tech forum and here was the possibility of a tensioner but the belt is tight and the tensioner has no unusual movement in it. thanks


2003 qc 4.7
3in bl,1.5 t bars,2in block 33's comming soon 33's on
new truck 98 dak cc 2.5l goin low pics to follow
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post #2 of 15 Old 09-16-2009, 12:00 AM Thread Starter
dakqc47
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ok 33 people and no one has an idea i mean the problem is apparently a ghost but yall helped me out every other time am i the first? really i feel soooooo special lol


2003 qc 4.7
3in bl,1.5 t bars,2in block 33's comming soon 33's on
new truck 98 dak cc 2.5l goin low pics to follow
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post #3 of 15 Old 09-16-2009, 12:10 AM
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Quote:
Originally Posted by dakqc47 View Post
ok 33 people and no one has an idea i mean the problem is apparently a ghost but yall helped me out every other time am i the first? really i feel soooooo special lol
I would take it to AUTOZONE and have them hook up and check the battery and altenator... other then that I cant tell you whats wrong.

You may also want to check all your connections and insure your battery connectors are tight and secure. Double check the plug to your altinator and the one hot wire going to it.


SPEED SAFE, AIR RAM
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post #4 of 15 Old 09-16-2009, 01:07 AM
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Had the same problem a while back, except for the lights flickering. Would like to say I have an answer for you but I don't becasue my problem went away soon after. It happened though when I was driving one time in an extreme down pour. Don't really know if that has anything to do with it or not. My check gauges light was also followed by a low voltage code the next day. One thing that I was looking into though was the temp sensor that is under the battery. It reads the temp of the battery and then sends a signal to the PCM on how much to charge. The other thing was maybe the regulator was bad in the PCM. But start small and like was said, go to your local parts store and have them check the battery and the alternator. If they check out check all your connections between the battery alternator and PCM. Also check all of your grounds out and make sure they are making good connections.


Other than that IDK what to tell you since my problem went away and never came back. This was about three months ago and hasn't happened again.

My truck is cool.


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post #5 of 15 Old 09-16-2009, 10:03 PM
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happens to my durango when the belt gets wet. I would get your alternator checked out

2000 Durango 4.7 4x4
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post #6 of 15 Old 05-07-2011, 07:46 AM
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Help!

Hi, just curious if you ever found a solution to your problem. I am having the same trouble right now, and going tomorrow to work on it some more in the daylight. Please let me know.

Thanks!
Amy
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post #7 of 15 Old 11-25-2011, 02:51 PM
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Same here, going to go have the alt/bat checked out, but never have power issues so I seriously doubt either of them is the issue...

Tim
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post #8 of 15 Old 11-25-2011, 08:07 PM
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If it seems to be RPM related, I'd bet on the alternator being bad.

The alt in my Ranger gave up the ghost last year while cruising along at 60mph (no tach, unknown RPM), pushed the clutch and voltage came back. Ended up driving slower and slower to keep the RPM low and voltage up. 5th gear at 30mph sucks... ANYWAY, turned out the brushes and commutator were beat up and bouncing apart from one another.

Beyond that, clean all the connections, reset the PCM (since that controls charging for us) and have it tested if still acting up.
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post #9 of 15 Old 11-25-2011, 08:12 PM
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Most, not all electrical gremlins are due to bad GROUNDS.
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post #10 of 15 Old 09-20-2013, 02:26 PM
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Did you ever resolve this issue? My 2003 Dakota does the same thing, even after the meter goes to zero the voltage at battery when running is under spec at 13.8 to 14.2 ish, including when under a load.
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post #11 of 15 Old 09-30-2013, 05:40 AM
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i had the same problem mine was a lose connection at the neg. battery cable with the aftermarket termal I was using

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post #12 of 15 Old 05-26-2014, 03:12 PM
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Re: alternator voltage drop

I agree with the neg battery cable. I did knock on the alternator with a 2x4 to try to knock the brushes loose and it seemed to cure the problem for a while. seems like temperature and rainy times made it worse though.
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post #13 of 15 Old 12-16-2014, 09:51 AM
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I have the fix!

I had all of the same symtoms, all were intermitant then at the end it finally got worse. Zero volts shortly after starting, draining the battery, then it finally died, luckily in my garage. PCM? Alternator? Battery? Cables? Alternator and battery tested good, though not in the failed condition at the time. I really didn't want to shotgun parts at it, nor did I want to take it in for repairs that would be costly. Out of curiosity I pulled the alternator and took the cover off to expose the brushes. They were pretty much shot and the area was very dirty. I ordered a new set of brushes from Maniac Electric Motor online, under $15 shipped. Ordered on Friday, had them on Monday (Texas to Colorado.) Took 20 minutes to re-install everything and bam! No more issues. Strong charge, good indications on volt meter. I have only driven 40 miles, but I saw no deflection on the gauge so I'm good. $15, I'm very happy! Any questions let me know, I'll be happy to help!
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post #14 of 15 Old 01-25-2015, 10:21 AM
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joelstein64 is right

I can confirm joelstein64 finding of alternator brushes.
2000 Durango, 178,000 miles, I'm 3rd owner (purchased May 2014)
Backstory: "Check Gauges" light came on and Volt meter drops to 8 (lowest my gauge shows). So I joined this forum! Where I learned a ton about my Durango. One thing is that a Scan Tool is built right into the vehicle - You can read codes in the odometer LCD Display! Ignition: On/Off/On/Off/On gave a Diagnostic Trouble Code of P1682 "charging system voltage too low". Checked all grounds - good. Checked 140 amp fuse in Power Dist Center - good.
Had auto parts store perform in-vehicle test of the alternator and they said it was the Electronic Voltage Regulator (EVR). Since EVR is in the Powertrain Control Module and the PCM is expensive, I seriously considered installing a mid-70's Dodge external voltage regulator to verify the EVR is really the problem before I spend big bucks on PCM. My neighbor is a mechanic and he suggested at least looking at the alternator brushes first and BINGO! they were really, really worn and no longer making contact to the really, really worn shaft.
I cleaned the brushes and shaft with rubbing alcohol on a Q-tip, reassembled and re-installed, and problem solved. I know Dodge says that the alternator is not serviceable, but the brushes are and joelstein64 has the least expensive fix. I didn't have time to source the brushes on Saturday night plus shaft is worn, so I just replaced the entire alternator for $170.00.
Hope this helps some one.
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post #15 of 15 Old 02-20-2015, 01:51 PM
shella
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1990 Durango

My car started acting up about 3 days ago, the first was I started it and it wouldn't stay on so I had to drive the car home with 2 feet half the way and when I got almost home I was able to drive regular, the next day the truck started up fine and I drove to work. Later on that day the Check Gauge light came on so I stopped and checked my oil it was low so I added oil and drove home. I took it to the shop that night and had my oil changed, while driving from the shop the check gauge light came on again, but the oil gauge was fine, the battery gauge was at the lowest it could go. We made it home fine w/light still on. That morning I warmed my car up and when I came back out side, the headlights were dim, radio was off, check gauge light, Brake light and Air bag light were all on and my gauges were going up and down all of them. I tried to put truck in reverse and it cut off. The door chime was going off at first than stopped, tried to start again and nothing happen. Got my neighbors to give me a jump, battery gauge went up to the middle line and my car started, as soon as he took the cables off the gauge light came back on and the battery gauge started going down slowing and finally got to the lowest. I tried to reverse and the car cut off again, we tried his new battery out of his truck and it started my truck up, the gauge light stayed on and when I tried to reverse it died again and the lights all lite on my dash off and on and the gauges moved up and down. Please help don't want to spend money that I don't need to spend. I'm told to check ground wires and Alt, i cant get the truck to autozone to test it and I know its not the battery. Single mother of 3 who doesn't have money to waste. Please help!! Thanks in advance
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