Question about 1995 Buick Park Avenue

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My alternator is not charging properly and was just replaced all battery connections were replaced also. I noticed that the harness only has one wire connected to the alternator is there supposed to be more?

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You should Have a ground wire connected and then either one large wire that runs to the battery and to the sparkplugs which this one should have or one ground and two smaller wires with one running to the battery and one to the sparkplugs.

Have you gotten the alternator tested otherwise? Once in a long shot they are bad, an auto parts store will generally do it for free but check first before having them do it since places vary.


Benjamin

Posted on Jul 16, 2009

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Why alternator don't charge on a 1979 ford thunderbird?


If you can use a new wire and they charge the battery then most likely you have a broken wire in the harness that runs between the alternator and the regulator.

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2003 bmw x5 4.4 battery light stays on


Brother Mark, changing the battery with a new one being done won't make the light go out, as you noticed. Light is still on so you changed the alternator. Good, but the battery light is STILL on. This only means that the charging circuit from the alternator is not working in the voltage regulator or the wiring is not connected properly to the alternator/regulator. A new battery will show over 13 to 13.5 volts not connected. An old battery will still show 12 volts and still be weak or bad. After connected and engine running, the system will show at least 14 volts because alternator/regulator is working properly, using a voltmeter/load tester connected to the battery. If after replacing the battery and alternator it is still reading 12 to 13.5 volts, it is not working and the light will stay lit on the dash. You may have purchased a faulty alternator if the system tests out this way. Have your system checked with a volt meter or load tester bit be sure all the connections are proper and clean.

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Engine electrical alternator


1. Disconnect positive cable from battery (or sparks may fly when you are disconnecting alternator wires).
2. Loosen and remove alternator belt (use the appropriate wrench, socket and/or ratchet to push/pull the drive belt tensioner to take spring tension off the belt)

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3. Disconnect wiring harness from alternator
4. Unbolt alternator from bracket
5. Do steps in reverse order to install new alternator (inspect belt carefully for cracks, replace if necessary)
NOTE: If you want to test your charging system, buy or borrow a simple VOM (Volt-Ohm meter), and check the voltage across the battery terminals with the car running. Voltage should be between 13.5 and 14.5 volts if alternator is working properly. Make sure battery terminals and cables are clean and connected tight. Charging system may not function properly if cables are corroded or loose.

Jan 28, 2014 | 2000 Ford Taurus

1 Answer

Rf-ys4e-6090-ag


I was having the same issue, and noticed that the wiring harness on the alternator was shorting out. Once I replaced the harness, the alternator was charging just fine and the battery light turned off.

Nov 19, 2013 | 2002 Mazda Tribute

1 Answer

How to replace alternator on 2000 3.0 mitisbishi eclipse


  1. Disconnect the negative battery cable.
  2. Remove the headlamp washer reservoir tank.
  3. Remove the condenser fan and upper radiator insulator.
  4. Loosen the tensioner pulley and remove the alternator drive belt.
  5. Remove the alternator upper and lower mounting bolts.
  6. Remove the alternator support bracket mounting bolts.
  7. Remove the alternator support bracket from the vehicle.
  8. Disconnect the alternator wiring harness.
  9. Remove the alternator from the vehicle.

To install:
  1. Install the alternator to the vehicle and connect the wiring harness.
  2. Install the alternator support bracket to the vehicle and tighten the bracket mounting bolts to specifications.
  3. Position the alternator on the mounting bracket. Install and tighten the mounting bolt and nut to 17 ft. lbs. (24 Nm).
  4. Reinstall the drive belt and adjust the tensioner until the proper belt tension is achieved.
  5. Install the upper radiator insulator and condenser fan.
  6. Install the headlamp washer reservoir tank.
  7. Connect the negative battery cable and check the charging system for proper operation.

Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.

Sep 05, 2010 | 2000 Mitsubishi Eclipse

1 Answer

How many labor hours will it take to install a new alternator in my jeep grand cherokee?


How to Replace an Alternator (DIY Time: 2.5 hours)
Complexity: Moderate

Parts:
1. Alternator - $151.95

Tools:
1. Combination Wrench Set
2. Screwdriver
3. Multimeter
4. Serpentine Belt Tool
5. 3/8 in. Drive Ratchet
6. Socket Set

Steps:
Step 1 Open the hood and locate your vehicle’s alternator.
o Tip: Safety Tip:Always wear safety glasses when working on your vehicle. Wear other personal protective equipment (PPE) when necessary, for example latex gloves or safety shoes.
o Tip: Always make sure the struts on the hood can fully support the weight of the hood so that it does not close on you while working. The use of a hood prop can securely hold it in place.

Step 2 Using your digital multi-meter, check the battery voltage. A dead battery will usually have less than 9 volts. This would not be enough power to start most vehicles.

Step 3 To verify that your alternator is bad, make sure your battery is fully charged and can pass a load test.

Step 4 With the good battery installed, connect your digital multi-meter across the battery terminals with the engine turned off. A good battery should read between 12-13 volts.

Step 5 Start your engine and read the digital multi-meter’s output. The voltage should rise near 13.5-14.5 volts.

Step 6 Using an open end wrench, disconnect the battery’s negative cable.
o Tip: When disconnecting battery cables, be sure to always disconnect the negative cable first and do not allow it to come in contact with the negative terminal post while working on the vehicle.
o Tip: Wrap the battery cable with a shop towel and pull it away from the battery terminal.

Step 7 Disconnect the power and ground wires on the back of the alternator paying close attention to where each wire connects. Disconnect the wiring harness connector.
o Tip: Check for a loose wiring harness connector, cracked wire insulation, and corroded terminals. Replacing the wiring harness may be necessary.

Step 8 Loosen the alternator bracket bolts, and alternator adjusting bolts or alternator belt tensioner so that you can remove the alternator drive belt.

Step 9 Using the proper size socket and ratchet, remove the alternator mounting bolts, spacer (if equipped), adjusting bolt, lower pivot bolt (if equipped), and the alternator.

Step 10 Install new alternator.

Step 11 Using the proper size socket and ratchet, loosely install the alternator mounting bolts, spacer (if equipped), adjusting bolt and lower pivot bolt (if equipped).

Step 12 Install the alternator belt.
o Tip: When installing the alternator belt, make sure the alternator belt is fully seated in the groove of the pulleys.

Step 13 Pull the alternator until the alternator belt is tight.

Step 14 Tighten the alternator mounting bolts while gently moving the alternator unit to achieve proper alternator belt tension.

Step 15 Reinstall the power and ground wires to alternator. Install the wiring harness connector.

Step 16 Push down in the middle of the alternator belt to check belt tension. If the alternator belt moves more than a half an inch, it is too loose, adjust the alternator belt to proper tension before proceeding to next step.

Step 17 Now that the alternator belt has been installed and adjusted, reconnect the negative battery cable. Start the engine and check the battery voltage to verify proper alternator charging.

Step 18 Turn off the engine and recheck the alternator belt tension. Readjust the alternator belt tension if needed.


Good luck (remember comment and rated this).

Apr 19, 2010 | 2000 Jeep Grand Cherokee

1 Answer

Replaced alternator on 1985 Ford Bonco 4X4 302 engine, made sure the new one was tested at the store before bringing it home. Will not produce charge to battery. There are 5 posts on the back of the...


turn your vehicle on, disconnect the battery, both terminals(while truck is still on) if it dies on you, then either the alternator is bad or wiring is wrong. if it stays on, then you may have a bad battery or voltage regulator. Check the voltage on the battery before you turn it on(should be from 11.5v-12v), when you turn it on if the alternator if working properly you should have around 13v-14v.

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use a volt meter while the car is running to check the main wire or large red wire coming off the back of the alternator it should read a steady 14 volts, the volt meter must be set at dc 10 amp settings, ground the black wire to ground or a metal surface some where on the car and touch the red probe wire on the volt meter to the main terminal of the alternator as i said it should read a constant 14 volts if it doesn't the alternator is bad.

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When that light comes on, it is indicating charging system problem which could mean alternator not charging for one reason or another like loose belt, faulty alternator, or yes, bad battery or connection at battery, for example. First & easiest thing to do is check all your connections to battery, which you've probably done, and make sure they're tight & clean. Make sure belt driving alternator is good & tight, and in good shape. Now boost the vehicle to get it going & test voltage at battery, after you take cables off. My guess is in your case, the voltage will begin to go down, indicating a bad alternator, that will need to be replaced.

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Hi before you go changing the alternator check the alternator belt is tensioned properly if this is slipping it will cause the same thing, Hope this helps

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