Question about 1997 Jeep Wrangler

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Check engine light flashes and engine stalls at the same time voltage gauge drops to 9 volts

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Make sure that your battery cable contacts are clean and secure at both ends including any body grounds especially at both fenders, firewall and dashboard lower brace. If all is good, likely your alternator is failing. Be aware: some of those charging systems have the voltage regulator as an integral part of the computer, not in the alternator. If you find that the alternator checks out and the wiring for it is intact and its connections are clean, there is a possibility that the regulator has failed. If so, the computer needs to be changed. You don't necessarily need to get a new one as most are available much cheaper in a scrapyard (Id get one that was in an accident...ones with perfectly good bodies may have had engine problems otherwise they would still be on the road!

Posted on Nov 17, 2009

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Posted on Jan 02, 2017

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1 Answer

WHY IS MY VOLTAGE FLUCUATING CONSTANTLY FROM 9 VOLTS UP TO 15 VOLTS????


It sounds like a loose cable that is vibration sensitive. I am not exactly following you but if it stops when the car is turned off then get the alternator and or regulator tested. Your battery should hold about 13.8v when running.

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Check electrical connects at the battery , power cable to the main fuse box under the hood in the engine bay. Voltage drop testing starting an charging system circuits . Find electrical distribution diagrams here http://www.bbbind.com/free-tsb Enter vehicle info, year , make , model an engine size . Under system click on electrical distribution ,then under subsystem click on power distribution . Click the search button then the blue links one at a time . Check main power feeds . Check for resistance in power feed cables .
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I HAVE A 1994 BUICK REGAL,WHEN I START THE VEHICLE THE AMP GAUGE STAYS AT ABOUT 6 VOLTS,AND THEN I TURN ON THE PARKING LIGHTS AND IT GOES TO NORMAL ABOUT 14,I TURN OFF THE PARKING LIGHTS AND IT STAYS ON...


replace the voltage regulator
amp gauges read amps or current flow
volte gauges read volts so if the volt gauge reads 6 with the engine running indicates that the regulator is not coming into service until the battery voltage drops and that triggers the regulator
an accredited auto electrician will be able to test the complete charging system and advise on the fault

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I have 1994 Ford Escort LX wagon 1.9L engine. Car just cuts off at random times while driving. Replaced the fuel filter and is still having the same problem. I can turn the car off and back on while...


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1 Answer

Gas gauge on park ave 1999 does not give accurate reading. Jumps around. Can it be done without dropping tank.


Buick dealers have a diagnostic box that checks gauge sweep and range, an 0-100 Ohm variable potentiometer with key on can check this gauge however you must tap into the wire going for the sending unit at the tank. With a voltage meter check the four wire connection (only one)connector going to the top of the tank, find a good ground and check for voltage one will be 12 volts with KEY ON ENGINE OFF look for a 12 volt reading for 5 seconds and then it will stop this is for priming fuel rail and is to fuel pump, you want the ground side of the gauge the other two will be grounds, fuel pump and gauge. The grounds may be near the wiring harness going to the frame. In either case they will be grounds you are looking for the one that is not either ground or power, most likely it will be either a flashing light or very low voltage. Attach the pot to the gauge wire and have someone watch the fuel gauge if it is erratic the gauge is the problem. If the gauge sweeps slow and steady the problem is in the sending until in the tank. AND HAS TO BE DROPPED! Run the tank down on fuel as low as you dare and drop tank. Be carefull working with fuel can be very DANGEROUS if you are not experienced working around fuel DON'T Attempt!

Oct 13, 2010 | 1999 Buick Park Avenue

1 Answer

Voltmeter drops to 9 volts on Chev 454 P30 motorhome


this is eithere a loose positive cable from the altenator to the battery or the regulator in the altenator is about to fail. if you have not had any problems starting the vehicle then most likely its a loose connection between the gauge and the charginging circuit or the gauge is faulty. take a multimeter and test the charging votage at the altenator while the vehicle is running it should measure 13.5 volts and should not change more than .5 volts. if the voltage drops more than 1 volt the regulater is bad and the altenator needs to be replaced. if it is working fine then looke for a bad connection make sure all positive and ground cables are tight. if they are replace amp gauge

Apr 19, 2009 | 1994 Chevrolet C/K 3500

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