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Intermittent Voltage drop driving - Cars & Trucks

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Depending on the make/model/year of your car, it sounds like a voltage regulator. They're usually right next to or ride piggyback on the alternator/generator.

Posted on Feb 08, 2014

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Intermittent problem - speed dial 'drops out' sometimes for a few seconds, sometimes for a couple of minutes, then returns to normal operation


What year an model ford ? Electronic module clinch , lose or corroded connector or wiring , ground wiring etc... Do you know what voltage drop testing is ? Voltage drop test main battery cables , What is Voltage Drop Voltage testing fundamentals Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia

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Winshield wiper delay intermitent module making noises


The wiper delay is in the steering column. It's a small box about 2 x 2 inches with a wiring harness attached. With the testing procedures I found below, you should be able to figure it out. I found wiper delays on eBay for around $10 to $20. Good luck.

WINDSHIELD WIPERS CHEROKEE, COMANCHE & WAGONEER 1. POWER INPUT Remove circuit breaker. Test battery side of circuit breaker. If battery voltage is not present, repair open to splice. Test across circuit breaker terminals. Tester reading should be zero (0) ohms. If not, replace circuit breaker. 2. GROUND Connector A unplugged. Test terminal G. Tester reading should be zero (0) ohms. If not, repair open to ground. 3. INTERMITTENT WIPERS Ignition switch in ACCY. Remove delay module and plug connectors together from the module. If wiper operate in LO and HI speed modes and mist (washer) is working, if wipers and mist operate, replace intermittent module. If not go to step 4. 4. WIPER/WASHER SWITCH Ignition in RUN, wiper switch position as indicated, back probe switch side of connector A for standard, connector B for intermittent: Test connector terminal E-wiper switch in LO and mist/intermittent. If battery voltage is not present, replace switch. test connector terminal C-wiper switch in HI. If battery voltage is not present, replace switch. Test connector terminal F-wiper switch to OFF. If battery voltage is present until wipers stop and then voltage drops to zero (0), system is working fine. If this does not occur, replace switch. 5. INTERMITTENT WIPERS Connector B unplug. Test across terminal A and D while rotating switch from minimum to maximum delay. If tester reading is not between 0-500 ohms, replace switch. Test across terminal A and G while rotating switch from minimum delay to maximum delay. If tester reading is between 0 and 500 ohms, replace wiper module. If not replace switch. 6. WIPER MOTOR Ignition in ACCY, wiper switch position as indicated, probe connector D. Test connector terminal 1. If resistance is no zero (0) ohms,repair open to ground. Test connector terminal 4-wiper switch in any position. If battery voltage is present, replace motor. if is not repair open from fuse panel. Test connector terminal 2-wiper switch in LO. If battery voltage is present, replace motor. If not , repair open from wiper switch. Test connector terminal 2-wiper switch in HI. If battery voltage is present, replace motor. If not , repair open from wiper switch. Test connector terminal 5-wiper switch OFF with voltmeter connected. If battery voltage is present until wipers stop and then voltage drops to zero, system is OK, replace motor. If not, repair open from wiper switch.

62217_jeep1_1.jpg


62217_jeep2_1.jpg

Found on the web. I hope this helps.
Rich Long

Jan 26, 2014 | Jeep Cars & Trucks

1 Answer

Engine shut down while driving


ohms of resistance , that's not a valid test ! Voltage drop testing is the preferred method of testing power an ground circuits . Voltage Drop Test Battery voltage - fully charged battery 12.6 - 12.4 only half .

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what make , model an year vehicle ?

Mar 11, 2017 | Acura TL Cars & Trucks

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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

1 Answer

When driving my 2002 silverado my lights will dim


Most likely it is the voltage regulator in the alternator . this is common of a alternator be for going bad, some times this is caused from jump starting.rarely it could be a intermittent short. but it would save a lot of time to have the alternator Thrilley tested or even replaced.it really don't mater about the volt out put.if the reg. is failing .hope this helps .if you want any further assistance feel free to ask.we are here to help.

Apr 06, 2010 | 2002 Chevrolet Silverado

2 Answers

Cqr drives then gauges go haywire then dies sits for a time starts drives for a while the gauges go haywire then dies


It sounds like an intermittent alternator/voltage regulator problem. I would suggest testing the alternator.

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