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Bad ground test - TrailBlazer Chevrolet Cars & Trucks

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Go to You Tube Video
Once there- at the top- put in
your question
You can watch & see how to do parasitic current
drains,test for feed & ground side wiring issues

Posted on Jul 26, 2013

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My radio and dash lights wont work checked all fuses and they are goo please help


ford is notorious for having bad grounds which would cause your symptoms. Check the dash harness ground which should be on the main harness as it comes up from the steering column. It is better to check the ground circuit which can be done with a test light, just instead of grounding test light as usual use the grounding clip on a positive wire and touch tip of test light to ground, light on you have a good ground, no or dim light check ground attachment bolts or wire.

Feb 26, 2016 | 2000 Ford Mustang

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Has spark no injector pulse has power to the injectors


No pulse means the injector ground side is absent, since you have power to the injectors. The ground wire goes into the engine computer to be internally grounded for the pulse. You can test the injector ground side with a test light, as a verification of it not having pulse. If it really has no pulse, but it has correct voltage to the injector solenoid, then you have a bad injector, or a bad ground wire to the pcm, or a bad pcm.

Use a test light with a ground clip and a needle-type probe. Unplug the injector connector and note which is the power wire terminal and which is the ground wire terminal. Clip the test light lead to the POSITIVE battery post, and put the probe into the injector's ground wire terminal. Now have someone crank the engine over and watch for a blinking light on the tester. If you have a blinking light, the injector ground side is working right, so check if voltage to the injector is correct, or if you have a bad injector. If you have no blinking light, then no pulse is correct. You will need to check the ground wire to the computer before assuming a bad computer. I think they are called quad drivers inside the computer that control the injector grounds.

Best way to check that ground wire is, first, take off the negative battery cable, then pull off the computer connectors, then use an ohmmeter to check resistance of wire from injector terminal to the pin on the computer's connector. Low resistance, low ohms, means the wire is good. ...But first I guess you will have to find the pin-out diagram for the computer, where and on which connector that ground wire goes in at. There's around a hundred or more wires going in, so color coding, tracing by the color of the wire would be a royal pain. Good luck, Scott.

May 07, 2015 | Cars & Trucks

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My farmall H will not turn over at all. Battery is good. 6volt. Manual push button start. New starter . Nothing Help please.


Haven't work on one these but following is what I use for finding bad grounds even though I got several meters.

You can rig up test light using some wire and a 6 v lamp bulb. It won't give an exact voltage readings but a brightly lit lamp indicates at the present of the voltage.

For testing for bad grounds use the main battery ground connection and probe the ground connections around the starter while trying to start. The test light will make it safer as you are just looking for a lit lamp will trying to start; just place the lamp where you can see it from the starting position. The test light will light if there is a bad connection between the starter's ground and the battery ground.

The same setup can be uses to probe to see if voltage is even reaching the starter through the switch and solenoid connections. If the starter solenoid is separate from the starter it can have a bad ground too and will not operate.

Nov 30, 2014 | Cars & Trucks

1 Answer

Two codes p 1684 and 1685


The battery was disconnected or you may have a bad ground. The good thing that it should not effect the operation of the car. It basically lost stored data and it must get it again. However, something is preventing it which means a bad ground, PCM was replaced/bad connection, quick learn for PCM. Other than this, you need a tech who will be able to test the PCM (they need a tool to test so the connnectors are not damaged) with a test light, Fused B+ circuits and/or ground circuits. However, before doing all that, bring to an auto parts store and get them to turn the light off. That may resolve it since this is not a "problem" code.

Jul 13, 2013 | 2001 Chrysler Concorde

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The head lights are not strong enough.


If your battery is on a full charge, but your lights are still weak, its a ground problem,check your battery

ground, make sure the connections on the battery are clean and tight. check the grounds on your lights,

check the molex connections attached to your lights, make sure there are no loose wires. if you have a

test light, check across battery , compare the weakness of your headlights to the test light, check

from battery positive to the frame. if the light is weak, you will have either a bad ground connection, or

a bad battery cable, if this is okay, test from battery positive with the headlights on at the headlight to

ground if it shows the same dimmness. its a ground problem. good luck!




Jul 31, 2011 | 2000 Ford Taurus

1 Answer

My window on the drivers side won't go up!


You may have a bad motor, try holding the switch up and bang on the inside of door toward the bottom front this may shake the internal parts of motor and make a contact to get window up, if this works then you have a bad motor, the best wat to test is with a test light, remove inner door panel and test for ground and power at the motor connector,while switch is held in up or down postion there should be power at one wire and ground at the other, if this is the case then motor is bad. if you dont have power or ground then you may have a bad switch. or broken wire coming into the door where the hinges sre. hope this helps.

Aug 28, 2010 | Ford Explorer Cars & Trucks

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98 chev astro van wipers work once in a while. What to do .


With wiper switch on check voltage at wiper harness, if you have voltage then reverse test light at battery and probe wiper housing if test light light up with screw driver ground wiper housing to mounting bolt, if wiper work bad ground, of test light did not light up when testing wiper motor housing for ground and you did have voltage at wiper motor replace motor, it's not going to be a fuse, if fuse was bad wiper would not come on once in a while, now if no voltage any where replace wiper switch.Good luck and hope this was very helpful, thank you for using FixYa.

Jun 02, 2010 | 1998 Chevrolet Astro

1 Answer

Fuel guage was erratic then went past full mechanic installed a new pump and sending unit now it stayed at 1/4 tank and when I filled it itwent below empty. bad sending unit or bad guage or bad mechanic?


Test the gauge by using a test light ,and grounding the test light clip to a good known ground,then touch the pink wire on the connector harness going to the tank,with the connector unplugged,and key on,the gauge will move slowly to the empty mark,and lower ,then remove the test light and it will go past full,if it does this,it is a good gauge,and the sending unit,was put in wrong,or the part was bad.

Apr 28, 2010 | 1997 Chevrolet Blazer

1 Answer

88 jeep trucks fuel pump has bad ground


try splicing in a new ground and see if that get the fuel pump running. also you can test it by applying 12 volts to the fuel pump wires themselves. if the pump is ok it should spin right up. if the connections are good and the fuel pump still doesn't run, it may be the pump itself that is bad. verify that its a always grounded switched 12 v style pump before attempting to test. if the ground wire just bolts to the frame or the cab then its a normal grounded system. some of the pump are always live and switched by applying a ground.

Feb 21, 2009 | 1988 Jeep Comanche

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