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How to adjust alternator belt tension 1996 Jaguar 4.0 L

At cold start the voltage might show 14 volts but if headlights or heater are turned on the voltage drops below 12 V ... alternator belt seems a little loose (I can turn the water pump pulley w/o belt moving). There is a threaded rod near alternator that I think is the tensioner with nuts on either side of a bracket. Need directions on how to tension properly.

Posted by Anonymous on


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  • 2 Answers


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Posted on Jan 02, 2017



  • 1 Answer

SOURCE: noisy water pump pulley,alternator pulley..timing belt tensioner

I have a 1995 xj6....same problem. I replaced the belts, water pump, and the alternator. Still does it. As I play with the tension on the belt (belt that drives water pump, alternator) it goes away and comes back. If I remove the belt, the metal to metal screech stops. I then, with just the belt, turned the main pulley on the front of the engine, and there was the sound! The main pulley has 2 belts that run on it. Also, 2 pulley tracks. They SHOULD move simultaneously and be super meshed. But the rear one moves on its own under tension until it warms up and I guess, the bushing maybe expands. do I fix it??????

Posted on Nov 17, 2009


Roberta Smith

  • 5158 Answers

SOURCE: 1984 jaguar xj6 alternator not charging can anyone help?

it's likely fried your battery.... probably a replacement battery would be good too.


Posted on Feb 07, 2009



  • 322 Answers

SOURCE: Serpentine belt

Below the water pump pulley

Posted on Apr 03, 2009


  • 104 Answers

SOURCE: I just replaced the serpentine belt on my 2001


Posted on Dec 05, 2009

AJ Oxley

  • 98 Answers

SOURCE: trying to change serpentine drive belt 2002 jaguar

Please see the video. Thanks

Posted on Sep 07, 2011

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2 Answers

I have an chevy suburban 1994 and the batterry lights going on and sometimes its not and when i start in the morninh the light is not on and when its getting warm teh lights must going on again

Sounds like the alternator may be failing.
The battery light on means the alternator is not charging the battery enough to turn the light off.

Mar 24, 2015 | 1994 Chevrolet Suburban

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How do i replace my alternator in my 2004 nissan maxima?

Basically first check battery voltage under load with headlights, fan etc on and give about 2500 rpm and check battery voltage with digital meter and expect to see about 12 volt range if Alternator faulty. If ok would be 14 volts approx.
Assuming battery voltage low. First remove negative battery terminal and proceed to take of drive belt by taking strain of belt by slackening tensioner on belt then remove and check belt for cracks etc on inside once removed. if damaged replace. Proceed and remove cowls, bolts etc as required to remove alternator. Before removing disconnect wires on Alternator. Assemble in reverse to above. Just a basic outline of how to do it.

Aug 08, 2014 | 2004 Nissan Maxima

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My 2001 5.3 litre shows voltage light on start up and gage shows low voltage it will begin to charge agian after a few minutes of idle i had the battery checked and it showed ggood next thing woould be...

Check the idle rpm (efi around 900 rpm ) carby around 750-800rpm. Very few alternators charge under 750 rpm as it requires 14 volts to charge the battery and at low revs the alternator will be producing around 11.5-12 volts. Check tension and condition of drive belt.

Apr 20, 2013 | 2002 Chevrolet Silverado

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I believe it's my alternator belt that is squealing. It does this when cold and when I tax the alt. ie: turn everything on. like rear defrost,headlights,heater fan. after the squealing stops you can hear a...

Check belt tensioner adjustment. Spray WD 40 on belts and pulleys and start. If no fix .it is most likely the rear bearings on the alt. before you buy a new one shoot some WD in the rear of the alt through the slits to the shaft. No fix take it to your local chain parts store and they will check it for free.


Jun 05, 2017 | 2005 Kia Sorento

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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

1. Alternator - $151.95

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

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

2 Answers

The battery light comes on and off when my heater or ac is on. It also lights on and off when I am driving. It has started to do it much more frequently recently.

First thing to do is check the belts for proper tension. Then check the charging system completely. This includes under a load and when warmed up. It sounds as if you have a worn belt and/or a charging system problem.

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Ok, I just got a new battery and coil ignition bwd.I also had my alternator re-built about 2 weeks ago,but my battery light still pops on when i turn the headlights on!my belts seem to be tight enuf. is it...

if you have a multi meter,
check voltage at battery with car running,should be at least 13-14 volts,
now turn on fan motor to high,flashers on,radio on, and check voltage at battery,regulator should have adjusted voltage to handle the load,should still be 13-14 volts,
now turn all that stuff off,and turn on headlights and recheck battery voltage,if below 13-14 volts replace regulator,if voltage is spiking higher than 14volts replace do not need other belts.

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1993 Grand Prix, 3.1 L Engine, when I start it up voltage regulator shows 12 volts , when I turn on the headlights it goes to 14 volts. I have checked the alternator & starter. Both ok.

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