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Need to find the diagram that shows the wiring harness contacts so that I can check them with a meter to ensure them working properly

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Try these websites and if all fails stop by your local library and get your hands on a Haynes auto repair manual for your truck.

Posted on Jun 25, 2009


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Windows stop working. swtich fuse and relay are good.

I'd probably check the wiring harness on hinge side of driver door. There is probably a protective rubber boot covering, pull the boot back to see wire colors. Look at wiring diagram for your power windows, check the proper wire colors for voltage and ground.
If you want me to try to post wiring diagram, I need year--make--model?
Your owners manual may show you which fuse and/or relay controls the power windows.

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Why on my95 jetta does the turn signals flash and not work properly when headlights are on They work perfectly when headlights are off

Probably a ground issue . Go on youtube an check out videos on voltage drop testing . Go to free wiring diagrams . Also watch videos on basic electrical trouble shooting , how to read wiring diagram etc.... Get yourself a DVOM - digital volt ohm meter an test the ground circuit . Voltage Drop Essentials TST Motor Age Electric Testing Techniques You Need to Know

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Right side running lights not working

littlepyrodu, I would first back probe the wires going to the light bulb socket first to see if you are getting voltage to the socket, Sockets are prone to sometimes get to hot and resulting in the contact (inside of socket) to recess into the plastic housing causing it not to have contact with the bulb contacts. If you do not know how to back probe, you need a volt meter, cheapy will do just fine, and two small alligator clips (if the leads that come with the meter does not have them(some do) and two straight pins. First crimp the alligator clips on the free ends of the lead wires of the meter, set the meter for a 12 volt range (make sure your above 12 volt setting, less will fry your meter, take the two straight pins and stick them in the two wires going to the socket in question, space them apart a few inches so there is no chance in shorting out the two wires, clip on the alligator clips to the pins, turn on lights, if the meter swings to the left, reverse the alligator clips, wrong polarity, now you should have12 volts showing on your volt meter, if not, you do have a broken wire in the harness, that is as you stated " Fuse Is Fine". You also stated that the wire may have been cut,, you shouldn't need a diagram / schematic for that, the opposing color coded wire should be right there, either at the socket end or at the business end (under dash). Note: Look to see if there is a worn spot in the carpet, drivers side right at the side kick panel, there is a wiring harness under the carpet there that goes along the door threshold to various components in the car. My wife had a habit of resting her foot there all of the time while driving and wore a spot there and it exposed the wires located there, reason I know they are there. And is also where I connected wires from a remote starter for the door locks and trunk release and parking lights... If there is a worn through spot there or not, I would at least check there to see if a wire has been worn into or shorted out, all you have to do is pull the carpet out from under the driver side kick panel, enough to see the wires, then just tuck it back under the kick panel when done. Hope this helps you and anyone else with this issue.

Jul 31, 2012 | 2000 Mercury Cougar

1 Answer

I just bought a 2006 Toyota Corolla S, and my dash lights and tail lights wont come on. All the other lights work, such as the headlights, break lights, turn signals, four ways, front fog lights and...

the tail light issue could be just bad bulbs, check them with a meter ,, also, check the sockets for power to each contact point,, normally if the brake lights and flashers are working, the tail lights should too,, as far as the dash lights have you installed an after market stereo? If so a common problem is a wrong wire got grounded,The harness from the car to the factory radio has a wire for the dash lights that shows up as ground with the light off. When the lights are on the wire is 12V+. Check to see if you connected the ground from the new stereo to this wire. The radio will work perfect but everytime you turn thr park light on the fuse will blow...and the radio will continue to work. There should be a ground wire in the harness as well, ensure you connect the ground from the new stereo to this wire. there is a 15 amp fuse that blows, check them with a meter rather than by sight

Aug 07, 2011 | 2006 Toyota Corolla

1 Answer

I need a wiring diagram for a Merc Sprinter 311 LWB, 2004.. Now doesn't start after a so called Merc Mechanic took the engine out and rebuilt it... Sounds like a fuel injector problem, maybe with the...

I am going to give you some generic advice that works on all makes and models. First check the fuses, Pull them as they can loose contact, thus loose power. Check all the igntion, ECM/PCM and BCM, Fuel pump and relay, and injectors fuses. Best to check them all, but atleast these. Also check to see if there is a security issue, your manual should tell you how to reset it. Check the fuel pressure, just because you have fuel, doesn't mean you have enough pressure. Wiring harnesses are what I call idiot proof, You can not plug the wrong wire into the wrong part. Engineers got something right. Now if all that checks out then you need to work your way to the injector harness. Disconnect a few that are easy to access. First turn the key on and check for power, one wire will have 12 volts, the other wire goes to the ecm. A test light or volt meter will work. If you have power then you need to test the ecm, you can use a volt meter or there is a NOID test light you can get that is inexpensive at the parts store. using the meter put the leads to the harness leads and have someone crank the engine over, the meter should jump in voltage, it wont read 12 volts as it is on for milliseconds. if you use the noid light it will blink. Check several injector plugs.
When you get this far, Let me know as I have lots more. I don't want overload you to much.

May 22, 2011 | Mercedes-Benz Sprinter Cars & Trucks

1 Answer

I am not getting power to my trailer lights on my 1998 jeep grand Cherokee

I would unplug the wire harness and check the contacts. Even if the contacts look good , Scrape them shiny then spray with electrical parts cleaner then grease lightly with dielectric grease. Also check where your ground wire goes - or maybe you'll want to run a test ground wire from the harness to the trailer to ensure a proper ground. 95% of the time the ground is the issue in trailer lights. Good luck!!!

Nov 27, 2010 | 1998 Jeep Cherokee Grand 2WD

1 Answer

Jeep grand cherokee v6 4.0 cranks but wont start has low voltage to all my senors

If you have verified low voltage using a scanner, keep in mind that some scanners will not differentiate no voltage from low voltage. Before testing, make sure the battery is fully charged and that all ground points are clean and secure. (in addition to the main battery cable to the block and fender, there are usually up to five more smaller wires on block and near the computer). Check all your fuses, especially those in the power distribution center.
To test further than that, you will need a good wiring diagram (chilton and haynes have diagrams but chilton seems to be more "readable" and accurate). First, follow test instructions in the manual and check each sensor. Then, use your multi-meter to check power at the computer harness plug, then follow the diagram and test wiring from the computer to the sensors, by disconnecting battery and using the ohm meter setting, checking for continuity from the computer harness plug to each sensor. (if you have a security system, find out how to re-set it before doing that) (Most commonly failed sensor is the crank sensor, followed by the cam sensor, so check both first) Most wiring problems happen at the connector ends either from a pin corroding (pin looks black) or where the wire joins to the pin.
Therefore, unless you see that a harness has burned or chafed through, normally you do not have to cut into taped areas. When working on a harness, it is often a good idea to use a notebook and write down the results, pin location and destination of each wire you check. That way, if an "odd" reading begins to show up in a shared wire, you can reference it to the diagram and get some idea of what is going on.
As you can see this is a bit complex....therefore I cannot give you a simple answer. If there, I'd need to do much the same as outlined above
In testing, you will invest some time, but will not be randomly replacing parts, hoping the problem will go away.

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1 Answer

Bypassed wire harness draining battery?

With the ignition switch in the off position, check each curcuit by pulling out each fuse 1 by 1. Use a digital multi meter to check for current drain by pulling the fuse and touching the contacts with an amp meter, if it shows current that is the curcuit you need to pay attention too

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you can get a repair manual at your local parts store it will have your diagram you need !

Aug 08, 2009 | 1997 Kia Sephia

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Hi. i recommend a thorough inspection of the wiring harness and harness connectors that led to the actual headlights. use a volt meter to test the current flow to the connectors. pull the connectors from the back side of the headlights and test all cooper contacts inside the connectors. If the wire contacts all show voltage, this will confirm a switch malfunction. it should be replaced in this case.

Now, if one or more contacts on the wires harness fail to produce any voltage, this will confirm a faulty wiring harness. replace the wiring harness in this case.

Make sure the headlight switch is in the on position when testing the wires.

Jul 30, 2009 | 2001 Ford Focus

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