Question about 1998 Nissan 200SX

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Nissan serena alternator

There is a lead running from my alternator but one of the wires is broken on the inside would that be the cause to my battery not keeping its charge? or do i just need a new alternator?

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  • mike_tartph Apr 27, 2009

    my ic regulator broke..cant get there anyway that it can be fixed?? if you know where to buy and how much will a new one cost??  thanks


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You must test first if your alternator produces output voltage (usually about 13.5V)
A test light is a simple but extrememly useful tool.
If you are trying to diagnose and troubleshoot an electrical problem, sometimes a test light can help you rule out possible causes much more quickly and easily than a DMM (Digital Multi Meter)

Posted on Aug 09, 2008

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Jeep 2005 TJ after battery is charged starts fine but drains within minutes while running .I had my alternate swapped with brand new and still acted same.What is telling Alternator not too produce?

possible faulty regulator or wiring from the alternator
for the battery to be draining noticeably when running one battery lead would be very hot to the touch and it would not start an engine so I suspect that you are forming that opinion from the gauges not showing a charge
that indicates that the alternator is not charging because of broken wires from the alternator or a problem regulator
I would take the vehicle to an accredited auto electrician so that all aspects of the charge system can be checked

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2003 Saturn vue awd 3.0 testing showed alternator putting out about 1/2- we replaced the alternator & the serpentine belt,- red wire?the new alternator in did not solve the problem-battery is new-

How do you know it's only putting out about 1/2 ? an 1/2 what ? Amps or volts ? Did you hook up a volt meter to the battery posts ? red to red an black lead to negative post of the battery ? Does it show 13.1 to 14. 1 volts with the engine running , if so it's charging . The only thing that would cause the alternator not to put out full charge amps would be a bad diode inside the alternator or a power or ground issue. You need to check power an grounds doing a voltage drop test . Voltage Drop Testing the Charging System

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Battery keeps dying, no headlights

Check to make sure the power lead from the alternator to the battery has a good connection. Sometimes the connectors get corroded, or the wire separates inside the insulation. You can check the wire for continuity with an Ohm meter...make sure to disconnect the wire at both ends when you use the Ohm meter.
Make sure the battery has a good clean ground. Make sure the alternator is grounded to the engine and the engine ground strap is intact and has clean grounds on both the engine and frame. Test the alternator with the engine running using a voltmeter across the battery. You should read 13.5 to 14.7 volts. If the alternator is not charging the battery will go dead under normal operation. If you don't get the correct charging voltage either your connections are bad or the alternator is bad.

Jan 20, 2014 | 2004 Nissan Maxima

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Battery light keeps staying on even though we have a fully charged battery and have replaced the alternator

Check to see what the voltage is at on on the large wire on the back side of the alternator. If its more than 14volts (with the car running) than put one test lead on that wire on the back of the alternator and the other test lead on the POSITIVE terminal of the battery. you should see less than .5 volts. If you see 12 volts or more than the wire from the alternator to the battery is open or has a lot of corrosion somewhere.

Nov 29, 2012 | 1998 Chrysler Concorde

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I have a 2003 Suburban. Would not start, so I jumped it off. As long as the cables were hooked up the truck ran. When I took them off, it died. I took the alternator and had it tested and it passed 3...

Yes a bad battery can cause this problem. Pull out the battery and take it to have check also. But, your wiring to the alternator maybe at fault. If your alt. is good but, it is not charging the plug or a wire may not be making contact. Check your battery. Check for any broken, burnt loose wiring. I know you just had it out. But check the wiring at the battery. The smaller wires are whats called "fusible links" meaning they are fuses. Tug on them a bit to see if inside the insulation you can feel the wire separate. Hope this helps Fix Ya up.

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My car keeps going dead, purchase a new battery yesterday the brake light and battery light is on will thuis cause car to go dead

YES! You have described a "NO CHARGING SYSTEM VOLTAGE' condition. You should have at least 14 to 14.5 volts at the battery with the engine running. If you don't, there are several possible causes:

1. Blown alternator fuse
2. Electrical cable between alternator & battery is broken or disconnected.
3. Alternator is not working/charging (voltage regulator inside the alternator).
4. Regulator at the alternator is disconnected or an open circuit exists between the alternator's regulator & underhood fuse box.

One quick way to verify "NO CHARGING SYSTEM VOLTAGE" is to start the engine and while it's running, disconnect the NEGATIVE battery cable. The moment you disconnect the cable, the engine will die. If it doesn't, you have a completely different problem -- the battery is dying over-night because there is an electrical drain on the battery after the key is turned off and removed.

If that's the case, and unless you know a good electrician, take it to an authorized Hyundai Service Center and have it properly diagnosed -- best advice I can give you without looking at the vehicle myhself.

You can gain access to Hyundai shop manuals and wiring diagrams by going to and register using the Vehicle's VIN #.

Hope this helps.

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We have replace the battery and alternator and the battery light is still on. What is going on???


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it is possible that bran new parts are defective if for sure that it doesnt charge check the wires from alternator to battery if not broken or a fuse in between could be burnt causing a no charge as well the plug in on alternator sometimes break inside the connector so check wires carefully but be sure alternator is good

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Red battery light came on and keeps flashing, gradually loosing all power in the battery. is it a bad battery or alternator?

When the battery light comes on, the alternator is not charging the battery.
Cause may be: bad alternator, loose or broken belt, connection problems (loose or broken wires).

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