Question about 1993 Mercury Tracer

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Alternator is not charging

Is there a schematic available for the charging system?

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You can find one in back of many manuals. not sure if this one has it.
or go online to try to find it, hard. if alternator is not charging just replace it. we used to take them to shops like regulators, and they would reword them with new diodes and cores. they are not that pricey.

Posted on Apr 21, 2014

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Posted on Jan 02, 2017

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If it is just the chassis battery that is not charging, then the battery isolators if bad. Check the output at the back of the alternator and if it is puttin out, then the problem should be at the battery isolator which is somewhere on the vehicle (most likely under the hood). Follow the alternator output and it will go to the battery isolator. At the battery isolator the lead coming from the alternator should read at least 13.5-14.5 volts and if it does, then check the other two leads coming off of the isolator and they should also read the same. The two leads coming off of the isolator should each go to a different battery and they both should read the same but if not then the isolator is bad. If the two leads coming off the isolator do read 13.5-14.5 volts, then there is a problem between the isolator wiring and the battery somewhere. Check the battery to engine ground, engine to chassis grounds and make sure that they are good. The chassis battery is more than likely a chassis ground so make sure that is has a clean connection. Coming off of the starter solenoid are several fusible links and they could be open(blown). There could also be other fusible links on the vehicle so check around the starter and along the wiring harness. Check the harness for frayed/broken/corroded/ or discolored wires as they can cause problems. If the charging system is working the batteries do not need to be new in order to read the correct charging voltage.

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1993 cadillac. I'm having trouble with the charge light coming on, only at night causing the headlights to go off and on. been pulled over 3 times now. The battery is new, had alternator tested and te


Could one WHAT be overcharging the other WHAT???

To understand the problem you must first understand that the car runs off of the BATTERY. The job of the alternator is to replace the power that the car uses back to the battery. The car DOES NOT operate off of the alternator (many people do not get this). The charge light comes on when the charging voltage from the alternator is lower than the voltage that is available at the battery posts (that is why the charge light is ALWAYS on when the ignition switch is on but the engine is not running.

If the CHARGING SYSTEM had been PROPERLY tested, you would have seen this in the tests. If you removed your alternator to have it tested, this does not test the charging system in the car.

This can be caused by a failure or high resistance in ANY PART of the charging system. This includes not only the battery and the alternator, but also all of the connecting cables, wires and the ignition switch.

If the battery and alternator are both good, then the problem is most likely a loose or badly corroded battery cable. However, high resistance in the ignition switch circuit to the alternator can also cause this type of problem. The charging system in your car needs to be PROPERLY tested to pinpoint the location of the fault.

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How to connect a new era alternator voltage regulator wiring diagram.Or a schematic diagram of the charging system.


knowing the color codes can be a great help..usually in 12v reg system,from the regulator there are 6 white wire having a stripe codes,blue means neutral,green means field,black means ground to body,white means hot wired to +12v,yellow means to bat charging indicator going to instrument panel and finally red means to ignition....and always secure the regulators case to ground.

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I need wiring schematics for the charging system on a 96 pathfinder the alternator is still good it's just not charging the battery it's getting power but not putting any out


test the leads at the alternator to be sure its not putting out,if it is than your cable to the battery is bad if not then alternator is bad.

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If the red charging light is on, it generally means one of two things: either your alternator is not charging or your battery is too weak and is not charging properly. It also could be a wiring problem in the charging system. The method of testing the charging system is to use an inexpensive alternator tester that clips over the battery cable and indicates positive current. Some of the major auto parts stores have testers available for free loan and may help you with it if you desire to try to fix it yourself. The problem is that the alternator is expensive, so you will want to be sure what the exact problem is before spending money. Inexpensive current/charging testers are available to determine if your alternator's output is sufficient. This should be your first thing to do, which is to determine where the problem is and if its not the alternator, its probably a wiring problem and/or poor battery or corroded battery terminals. It's also possible that your system is charging but there is a current drain somewhere. An in-line current tester connected to the battery will determine if that is the case.

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