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I have a intermittent voltage drop in my car, where might it be? Additional info: I have a voltage drop while cranking my motor over where my starter struggles to turn the motor against its own compr

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2 Answers

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  • Contributor
  • 13 Answers

My first thought would be to change the hot lead from your battery to selenoid n starter. Its a relatively easy and cheap fix to a big problem that just gets bigger with time.

Posted on Nov 05, 2012

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  • 4 Answers

Check your crank sencer

Posted on Nov 05, 2012

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

toneman2121
  • 775 Answers

SOURCE: 2004 F-250, 5.4l gas. Won't start or even crank.

are you referring to the starter relay on the firewall? the voltage should drop to 0 when measuring across the signal path because the connection is made, essentially making it a piece of wire and there is no difference in potential between the two points. is there 12v to the starter motor? is the starter solenoid (located on the starter) receiving 12v? check fuses and fusible links. disconnect hot leads from the starter. remove the starter, and supply 12v directly to the motor. does the pinon gear extend and spin? starter.

Posted on Apr 17, 2010

lscf150
  • 443 Answers

SOURCE: WHEN ENGINE HOT STARTER MOTOR STRUGGLES TO TURN

My guess would be silenoid or starter.
Good Luck !

Posted on May 02, 2010

  • 143 Answers

SOURCE: Intermittent non-start. No power to starter motor

sounds like the park pawl switck assembly located in the selector assembly in the car or on the side of the transmission could just be out of adjustment

Posted on Jun 06, 2010

  • 89 Answers

SOURCE: Car will not start, but the battery and starter are

hi, on most newer than 2000 vehicles, there is a computer cut out to the starter solenoid performed by the security system or theft deterrent system. also the pcm(powertrain control module) or engine computer does have an ignition sense circuit designed to control various functions. perhaps the ignition switch could be causing the problem, bad connection could be the case there. if the theft deterrent system is causing it, the security lamp may or may not illuminate. it maybe stored in the pcm memeory diagnostic codes only. you may want to take to repair shop. .... one more thing to check, if your key has a diode in it(looks like a black chip with a wire through it) check it closely to make sure it is not dirty or wet, or any other contamination of it. the diode is of specific ohms value and if any of the above mentioned things occur to the key, it will lock out the security system. good luck.

Posted on Jun 07, 2010

duane_wong
  • 6826 Answers

SOURCE: 2003 honda accord 2.2 car

Sounds like the connection to the battery may be dirty. Check the connections and clean as necessary using a stiff wire brush. Be sure to make the contacts look shiny and new with the wire brush, or else a no start condition.

Charge the battery for 3 days on a home charger to make sure it has enough of a charge.

If the starter tests ok on the bench, then the starter is ok.

Good luck on this repair.

Posted on Nov 25, 2010

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2 Answers

2003 ford e250. Won't start turn key and just clicks 2 times and then everything shuts off. I have replaced ignition switch and lock cylinder and still doesn't start


Testing the electrical circuit's is the best way to find the problem ! Voltage drop testing ! Reading factory sevice info. learning how to trouble shoot the problem , not replacing parts .Do you know what a wiring diagram is ? How to use one to find point's in an electrical circuit to test at ? Here is a web site for free wiring diagrams . http://www.bbbind.com/free_tsb.html Enter vehicle info. year ,make , model and engine size . Under system click on engine ,then starting in subsystem . Click search button , then the blue link . There is the transmission range switch , the starter relay etc.. you have connection problems or the main battery cable to the starter.
Starter Voltage Drop
How to voltage drop test starter motor circuit

Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts

watch these videos , buy a volt meter an test the electrical circuits .
Do you know what the relay switch is ?
The starter motor solenoid relay switch:
  • controls current to the starter solenoid.
  • is engaged by the ignition switch.
  • connects the battery (10655) to the starter motor.
The TR sensor on automatic transmission-equipped vehicles prevents starter motor engagement unless the transmission is in the NEUTRAL or PARK position. For additional information, refer to Section 307-01A or Section 307-01B .


Jun 23, 2017 | Ford Cars & Trucks

2 Answers

2002 town and country will not start intermittently. Been checked out at garage. Say they cannot find anything. Most times when try to start all warning lights come on.


Will not start how intermittently ? The engine won't turn over or engine does turn but won't start . Starter relay , lose connection . Checking power an grounds would be the first place to start , voltage drop test the main electrical circuits . Voltage Drop Testing the Starter

The starter circuit control is achieved by the starter motor relay ! It is located in the under hood fuse/ relay box or as Chrysler calls it ,integrated power module ! If you pull out the relay an look on the bottom where the pins stick out you will see four sets of numbers .30,87 an 85,86 ! 30 is B+ voltage . 87 is to the starter solenoid . If you jumped those two spots where the relay plugs into the starter would crank the engine over . The last two 85 an 86 are the control side .If you checked with a volt meter where 86 plugged into ,with key on it would show B+ voltage . The last pin is from the PCM - engine computer . When turning the key to start a signal is sent to the PCM to let it know crank has been requested , in return the PCM supplies a ground to pin 85 energizing the starter motor relay sending B+ voltage to the starter motor cranking over the engine . Here is another video on test from the relay base (where relay plugs into ) This is for a horn circuit but same thing . VEHICLE RELAYS Testing from the relay base The relay could be going bad , you never know .Replacing the relay mite not be a bad idea . Good luck , hope this helps !

Jul 23, 2016 | 2002 Chrysler Town & Country

1 Answer

200 windstar with a 3.8 motor cranking very slow then stops cranking and does not start


Could have a bad cable , to check voltage drop starter circuit ! Starter Voltage Drop Watch some other voltage drop testing videos ! You need a DVOM - digital volt ohm meter to do this testing .

Dec 21, 2015 | 2000 Ford Windstar

1 Answer

Wont start the starter is working yet it won crank what can I do


Did you check power an grounds using voltage drop testing , did you check battery voltage an computer control at the starter motor relay in the under hood fuse / relay box ? Instead of guessing you need to learn how to use a DVOM - digital volt ohm meter an test ! The powertrain control module controls the starter motor operation ! Starter Voltage Drop VEHICLE RELAYS Operation Diagnosis ,If you pull the relay an jump pin's 30 & 87 the starter should crank ,test the circuit starter motor side ! Pins 85 & 86 are the control side ., Pin 85 or 86 forget which one has battery voltage with the key on . The one with out voltage is control from the engine computer ! Also if the anti theft system is active it wont start !

Aug 25, 2015 | 2005 Chrysler Pacifica

1 Answer

Pontiac vibe ignition switch? Intermittent dash


Basic electrical problem . loose connection on a ground circuit ,high resistance . There are no magical fixes for automotive electrical gremlins . Finding electrical wiring diagrams an voltage drop testing the electrical circuits is the only way to find the problem .
When the ignition switch is placed in the Start position 12 volts is supplied through the Park/Neutral Position Switch or Clutch Pedal Position switch to the switch and coil side of the Starter Cut Relay. If theft is not active the Theft Deterrent Module grounds the control side of the Starter Cut Relay closing its switch. Power then travels to the coils side of the ST Relay with ground at G200 closing the ST Relay. Power then flows from the Main fuse in the Fuse Block - Underhood through the switch side of the ST Relay and then to the S terminal of the Starter Solenoid. Ground is found through the engine block.

How to voltage drop test starter motor circuit

How to test starter engine doesn crank GM 3800 engine

Knowing how the systems work is one of the first priority ! Learning how electrical systems work .
Learning how to read wiring diagrams an use them for pin pointing areas for testing .
Check for DTC'S - diagnostic trouble codes , this should be one of the first steps .
Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts
How to Use Multimeter to Troubleshoot Common Problems
Free wiring diagrams here
http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine size. Under system click on engine then under subsystem click starting . I would start with a voltage drop test of the main battery cable to the starter motor.

Starter Voltage Drop




Jul 13, 2017 | 2003 Pontiac Vibe

1 Answer

2002 Pontiac Grand Prix GT wont start. Has new battery. Starter was taken off car and works. Relays and fuses are fine. Power cables cleaned. Driver information center dim. Headlights are on when key...


PNP park neutral safety switch . Try moving gear selector to neutral . If it starts the switch is bad .
Voltage drop test starter circuit .
fusible relay ??? Now thats funny ! It's just a relay , not fusible relay ! A fusible link is a kind of fuse ,will melt with a short circuit. TEST ,TEST DON'T GUESS and if you can't test ,take it to a qualified repair shop. How to voltage drop test starter motor circuit
Starter Voltage Drop
The computer has nothing to do with it .

http://www.bbbind.com/free_tsb.html Free wiring diagrams ! Suggest you view a wiring diagram to see what all is involved in the starter circuit . NO starter relay ! Enter vehicle info. under system click engine, then under subsystem click starting . You will when you turn the key to start it send's B+ voltage to the PNP switch ,from there it goes to the S terminal on the starter solenoid . Very simple . Get a volt meter an test B+ voltage .

Jul 28, 2017 | 2002 Pontiac Grand Prix

1 Answer

Motor start but does not run


Are you saying that the motor runs until you stop cranking it? or just that it truns over while the starter is engaged but doesn't fire at all?
If it's running while cranking but stalls immediately after you release the key and allow it to go into the "Run" position, then the ballast resistor of the ignition system is most likely bad. The idea is that on older cars with electronic ignition, the starter motor caused such a big voltage drop on the cars electrical system that the ignition coil wasn't provided a high enough voltage for proper spark to occur, so they wired them such that the ignition coil could handle the low voltage which was present during the cranking of the starter, but when you stopped cranking and the engine was running normally, suddenly without the voltage drop of the starter, the voltage would be to high and would damage the ignition circuit. Thus a 'ballast resistor' was added to the ignition circuit and it is only in line when the car is in the "run" position. This allows the ignition system the proper voltage to operate whether cranking or running, but sometimes the ballast resistors go bad, causing the engine to run while cranking but causing an open circuit in the ignition system when placed in the "run" position.
Good Luck.

Mar 28, 2011 | 1993 Toyota Corolla

1 Answer

98 gmc 2500 intermittent starting 7.4l engine. started one day went to store now wont start, went under it seems the starter kinda clunks once and does nothing, its like the starter drive engauges but does...


There are only two problems with electrical circuits. Too much amperage or too little amperage.We have to determine what you have.
An excellent test is to put your test meter red lead on the positive battery post and the black lead on the negative battery post. Crank the engine and record the voltage. Then place the red meter lead on the starter's battery terminal and the black lead on the negative battery post. Again crank the engine and record the voltage. The two voltages should be with in one half volt of each other. If the voltage difference is greater that one half volt, there is a resistance in the circuit, somewhere. I would expect the voltage to drop a volt or two, max
If the voltage dosent drop, there is high resistance resulting in low amperage. If the voltage drops too low then there is low resistance resulting in high amperage.
High resistance=dirty terminals
Low resistance = shorted wire, slow turning cranking motor maybe caused by bad starter, bad battery or hard to turn engine. ( engine bad, alternator or power steering pump bad, a/c pump bad, etc)
Can use head light for test. Turn on lights and note the brightness. Crank engine. If while cranking, the lights stay bright= high resistance.
If lights go dim = low resistance.

May 01, 2010 | 2005 GMC Sierra 2500HD 4WD

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