Hopefully everyone has learned something from this - like how the GMT900 charging system operates based on the document I posted. I’d get or borrow a meter and clip it across the battery to verify the voltage. If it's a bad battery, I'll take it back to O'Reillys. Bought a brand new battery but still my electrical gauge reads only about a 1/4 output . I'm no battery-ologist, but couldn't a different battery read slightly different? Sparkey knows his shit man...all you have to do is hang around these pages a little and you'll quickly realize this. But still in overcharge mode. The ammeter may show an abnormally high reading briefly after starting the engine and the lights and other devices are being powered. My guess is the gauge reads a shade high and is reporting a healthy maximum system voltage … Reattach the fuse block's cover and close the hood. Make sure all accessories are switched off and only conduct the test after the battery has had 24 hours without any draw on it or charge put into it. The company I used to work for, before I was layed off, informed all employees that if and when you are acting as a representitive of the company, on and off work, to conduct ourselves in a professional and courteous manner since our actions reflect upon the company as well as all of the other employees. Reattach the three screws to the dash trim. Remove the four fastening screws on the instrument cluster itself using a Phillips screwdriver. Good, I thought. Gauge Bezel Color: Black. One day I ran the radio for 8 hours in the garage while my brother & I installed all the aftermarket accessories it now has. If necessary, lower the steering wheel down to its lowest point. Better but I'll have to keep my eye on it. This topic is now archived and is closed to further replies. I ran into this exact problem when working in a motorcycle dealer -- techs rushing through battery prep, resulting in a severely shortened lifespan. If the voltage gauge is fluctuating, but that’s the only symptom, besides checking the battery connections, I wouldn’t do anything. Ron They checked the battery and said that it was at 84% charge. Remove the three fastening screws from underneath the dashboard trim above the instrument cluster with a Phillips screwdriver. Pull on the hood release lever to the left of and below the steering wheel in order to open the hood. Drove back to O'Reillys to get my core charge, looked at the voltmeter and the reading was right on 14. Disconnect all three of the wires at the rear of the instrument cluster and pull the cluster out of the TrailBlazer. Posted December 6, 2007. So yesterday, I had to drive to the unemployment office which is about 20 miles away. In this case, either the ground to the gauge itself is insufficient (which will cause a too high reading), or the gauge is out of calibration. electrical accessories may be turned on and regardless of the number of hours since. I know how lead acid batteries charge from gas engines. A 2011 investigation by the government didn't lead to a recall; Posted on March 3, 2017 Author Scott McCracken Tagged #fuel-system #interior #investigation. Pull the dashboard trim off. Remove the cover from the TrailBlazer's fuse block in the engine compartment. A value above 0.45 volts indicates a rich condition, while a reading below 0.45 volts indicates a lean condition. bryan georgeStarted Yesterday at 03:02 AM, By The oil gauge is also doing the same thing. Does it tell you you’ve got half a tank one minute, a quarter tank the next, then a full tank half an hour later? Just out of curiosity, I wonder how many people that replied "it's normal" actually knew the information that is in the document? I have done my research and am asking this question on this forum ("Ask the GM Tech) hoping for a tech-type answer about my situation as it relates to GMs over-charge process. Sometimes it will sit at 11.5, sometimes at 14, sometimes at 16.5. Re: Voltage too high? The needle would be about halfway between the 14 and the next line. I have a 2008 Chevrolet Trailblazer LTZ 5.3L V8 140,000 km. Hope this helps – … Evan Purple240zt said: Also depends where your grabbing your power. Yes No. Looks normal to me ... unless it's a conventional battery (with removable tops for adding electrolyte) ... in that case it would be on the low side at 12.4V. Not right on 14 like normal. If someone here were to see your vehicle and hear the whines groans, spiked meter issues...etc...the answer may be totally different....but we go by what you are saying is the symptom...its like calling a doc and getting him to diagnose you over the phone for your illness....but you are not telling him about your explosive diarrhea...he can only diagnose what he thinks may cause your issue, on the info he has. I came to this forum for advice, not to be talked down to and his response just irked me a little too much that day. Get your charging system checked out if the voltage reading goes above 15 volts. This is called the, "open circuit voltage." View the answer I have this problem too Subscribed to new answers . They also gave me a printout about the Electrical Power Management (EPM) which is the process GM put in with the GMT900 trucks. Unplug the oil pressure switch in your 4.2L Trailblazer/Envoy/etc and you'll find that the oil pressure gauge still shows you oil pressure. My father’s 2003 Trailblazer EXT had a similar problem recently and the A/C low pressure switch (the one attached to the accumulator) was the culprit. I took it in today. This product is a great, environmentally-friendly alternative to buying a new instrument cluster. When we drive our car the bat gauge is in the normal 11-15 volts range but after a little while of driving its slowly creaps up toward the 18 volts end which is in the red area. I wouldn't be surprised if the new battery were faulty. This reading would indicate that the alternator is working coirrectly. I have a 2 yr free replacement on it. When it's cold out, you take what you can find. So even at idle you should register the 14.4V (approximate gauge reading could be different of course). I replaced the original battery and the readings were normal on the dash for one day then went up to the present high reading. Just got back from the dealer. Gauge is still reading on the 14+ side. If not, pull them off and connect them, making sure that all of the wires "snap" into place. GM Instrument Cluster Recall / Settlement Information and Vehicle Coverage Might be but you would like some proof, wouldn't you? Share. Let the car sit overnight and as soon as I turned it on this morning it went right up to 80 as soon as it turned on. Step 1: Locate the voltage regulator. Most gas tank units consist of two parts, the gas gauge mounted in the dash and a tank sender mounted in the tank.. Secure it open with the prop rod. If it reads 19 volts with the engine running, that is a different issue. Was running just below 13 with A/C and stereo on. So I replaced it with a new battery from O'Reillys since theirs was an exact oem replacement. This is the instrument cluster fuse. Even 2 AC-Delco's wouldn't be exactly the same . And like the guys said....no two batteries are the same. Install a new 10A fuse into the TrailBlazer's fuse block. Valladares holds a Bachelor of Arts in English from Rice University and is currently studying to become a personal trainer. 3 Answers. Overcharging can damage the battery or electrical system. Check it while the dashboard gauge is … AIU it could be either a grounded wire or a problem with the 5V voltage regulator. It should return to normal quickly. If he had responded in a more professional manner, and not sarcastically, then I would have taken his answer differently. I drove it last weekend and noticed that the voltmeter is reading between 14 and the next line (16?). That would be like you asking your doctor about a mole you found on your body is cancerous, and several people in the drs office says "IT'S NORMAL". Answered! I second the pressure switch. I was wondering if this. It might help to prevent any misunderstandings. (Sparkstech being the exception since he is a tech) And maybe the GM Techs will put something in the sig to indicate that they know their shit. I'm not saying your wrong, but I don't know you from Adam, and just because you like to use a megaphone doesn't make you right without any proof. I have included a copy of that document for your reading pleasure. I drove to work yesterday and it was fine, 4 hours later I turn the car on and it shoots up to 80 right away. If the gauges are bad, you will need to purchase a new instrument cluster to replace the faulty one which can be fairly expensive. Thats normal. What would make my voltage gauge read low when battery is good. Oil pressure gauge reading too high, or over 80 PSI while driving, especially at higher RPMs. The voltage always fluctuates, goes up and down depending on how much current is being used by the accessories, and the engine rpm, the charge state of the battery, the ambient temperate, all affect the voltage. I have a Scan Gauge so I pluged that in too see what it says. When I got home, I got my digital voltmeter and checked the voltage with the engine running (14.7, I think), engine off(12.7), several hours later (12.6), after sitting overnight (12.4). Battery good. I was seeing readings as high as 15.2 volts when driving this afternoon. OK so Saturday the check gauge light came on and the battery volts started to rise form there normal 14 volts all the way up to 18 volts and stayed pegged there for about 5min then the dropped back down to 14 volts. I hooked up a 3-stage desulphating charger every night for about a week, & I haven't had a problem since -- currently at close to 37,000 miles. I'll drive it around some more and see if it continues to stay high or act normal. Since the gauge reads too high, the focus really needs to be on the gauge itself. Powered by Invision Community. battery guage reading 18 volts Discussion in 'Engine ... Dec 12, 2011 Ram Year: 2000 Engine: 5.9 360. So I drove around a bunch, but the reading stayed above 14. I also had battery issues when I first got the truck. Score 16. Could still be a faulty meter, or possibly a bad battery with very high internal resistance, although I doubt it would start the car if that were the case. All I know is that driving home, the voltmeter gauge read either on the 14 or lower (for economy mode). Well, since I'm unemployed, I don't drive my truck everyday anymore. I went out this morning and disconnected the + cable from the battery and left it disconnected for around 15 minutes. They said that it was NOT NORMAL for the gauge to read in overcharge mode for that long of a period. Jul 13 2012, 12:49am. Cancel. The needle would be about halfway between the 14 and the next line. 14.7 with the engine on is normal and your reading with the engine are spot on. They checked it all out. Started the truck and the reading on the gauge is now on the 14 side of about halfway to the dash. It was the same before the engine swap and replacing the sending unit didn't help. I went out this morning and disconnected the + cable from the battery and left it disconnected for around 15 minutes. Kind of a reboot for the computers. I have two chargers that will desulphate those batteries also installed on the boats. I have been on this board for a long time. If the water pump is malfunctioning, it may need to be replaced by a professional. Ed B. Bugmenot August 3, 2016, 7:53pm #4. Just enough to click the solenoid ... and radio didn't miss a beat. Temp gauge reading high My stock temp gauge is right off the scale. Never trust how a ground looks. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. Thank you in advance for the help. You mentioned your voltmeter runs at about 15 volts most of the time. Truck had 2,200 miles on it at the time. Direct OEM replacement Ensures proper gauge operation. starting the vehicle (when the voltmeter typically reads 15v). Just because you called the doctor with your symptoms doesn't mean that the person on the other end of the phone is qualified to provide you an answer unless you knew it was an actual doctor. The gas gauge in the 2003-2007 Trailblazer is woefully inaccurate. If the gauges on the instrument cluster of your Chevrolet TrailBlazer are not functioning properly, there could be three possible causes: the gauges' fuse has blown out, the wiring connectors are loose, or the gauges themselves are bad. Reinstall the four cluster screws and the dash trim. Install a replacement cluster and attach all three wires to the new cluster. Started the truck and the reading on the gauge … Make sure all of the wires are properly connected to the instrument cluster. 2008 Trailblazer oil pressure guage at zero but driving fine? . If the gauges on the instrument cluster of your Chevrolet TrailBlazer are not functioning properly, there could be three possible causes: the gauges' fuse has blown out, the wiring connectors are loose, or the gauges themselves are bad. Or am I having issues with my charging system? Signal can go to the pm then to the gauge, it may go to a body module then to the gauge. . When the system does not require charging it … So I'd guess if you're seeing differences at the gauge it's most likely a gauge anomaly. So it looks like a trip to the dealer to get this diagnosed. And it's not like I was asking a question that had been asked a hundred times before where I could have found the response via the search button. Last thing I wanted to do was ruin a new battery with a bad charging system or ruin the charging system with a bad battery. Faulty gage? If it's NOT overheating its not the pump. They ended up reflashing the computer (BCM I think) and that seems to have corrected the issue. The re-flash probably re-set the meter to factory specs and corrected its movement. Responses of "it's normal" from people that do not own a GMT900 truck does not indicate to me that they are techs or that they are familiar with the new charging system. Plus I would not have expected a GM Tech, who in a capacity of answering as a GM Tech, would respond in such a sarcastic manner. On a given day the voltmeter may read 13v, 15v and 14v regardless of how many. Lots of integration between computers and other inputs. The 45amp stator puts out AC voltage of about 20-25Volts per 1000RPM. So before I take to my dealer to pay for a diagnosis, do the techs on here think it is a bad battery? About a month ago, my oem battery died when the temps were hanging below 10F. I would say that there was a 95% chance that your meter was a little screwed up in your cluster....and besides its no more than 85% accurate anyway. Remedying any of those situations is fairly simple and should only take half an hour to complete. In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. So for the most part, I don't know who is a tech and who isn't unless they somehow identify themselves as such. What to Do If Your Temperature Gauge is High If your temperature gauge is reading high, it means your car is overheating. If he is answering as a GM Tech, then his actions/responses reflect upon GM and all other GM Techs in general. "2009 Chevrolet TrailBlazer/TrailBlazer EX Owner's Manual"; General Motors Corporation; 2008. On the way home I stopped at O'Reillys. Always thought the truck turned over slowly. Salser2012 August 3, 2016, 10:13pm #5. Again, I'm not saying your wrong. Voltage Regulator caps the voltage to 14.4V regardless of load. He's a GM tech...if he says its normal...it probably is normal...and 14.2-15V is normal...Don't you think that you would have boiled your battery dry by now if it was REALLY overcharging for 2 weeks. On older cars, the voltage regulator will likely be a metal box a little more than an inch long and will plug into the dashboard. $190.95 … Reach behind the cluster to access the gauge wires. I am just asking for proof on why something that never happened before is considered NORMAL. your lucky if it's accuracy in within 10%... Ok - so today I had to do a 50 mile roundtrip on the interstate. Your mechanic needs to find this out and go from there. I read a lot of the postings that interest me but don't pay too much attention to the authors unless it is of great interest to me. It will sometimes adjust itself while driving, but the truck seems to be running without a problem. Connecting the voltage meter at the wrong point with the engine off would only result in a reading that was too low. I have read somewhere that your charging system can be ruined if you have a bad battery. Vehicle owners can check their manuals for specifics on how high the oil pressure gauge reading …
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