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My alternator will spin when you first try to start the car. The car will not start and when the crankshaft goes faster than the initial first rotation, the alternator stops spinning. why is this?

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There could a fault in the alternator

Posted on Sep 02, 2010


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Wont star put new battery in

If it ISN'T cranking over ok ... and has a discharged battery..
Disconnect the leads from the rear of the alternator. A faulty alternator can discharge a battery within minutes. Charge the battery and leave the alternator disconnected. Try and start the car.

If - with a charged battery and alternator disconnected - the engine seems very slow to crank or makes a 'clicking' noise ... try cleaning the battery terminals - particularly where the black lead connects to the engine block/bodywork.

Check the leads -and terminals - for breakage/corrosion. A 'bad earth' or corroded/loose battery terminal can cause non-starting problems.

If all is ok and the car spins the engine but won't start, suspect a sensor fault.

Don't waste money on replacing part after part in the hope that the care will fire up. The best - and cheapest - option is to have an OBD - a hand held diagnostic check done. This will identify any error codes and tell you the cause .. i.e 'crankshaft sensor fault'.

May 04, 2016 | Cars & Trucks

1 Answer

When idling my crankshaft pulley starts squeaking loudly and than the car dies out. But it will restart

I would suggest taking off your serpentine belt and by hand spinning the alternator , ac , water pump and any other pulleys to check for bearings going out . If they all spin freely start your car and see if problem persists . Do not run for too long since your water pump will not be circulating water this way .

Oct 19, 2014 | 2003 Ford Mustang

1 Answer

Loud rattling sound top of engine near or below the alternator when idling, goes away if accelerator is pressed

Hello: Remove the serpentine belt, see if the waterpump pulley wobbles/makes noise when you spin it. If thats not it then start the engine, belt still off see if noise is there also while engine is running see if vthe crankshaft pulley wobbles. Also check the A/C compressor pulley (engine off, belt off) spin it by hand and check for noise and wobble. If all the previous is ok then it could be the balance shaft front bearing and or the timing chain.

Oct 18, 2011 | 1998 Buick LeSabre

1 Answer

My radiator hose exploded just before the thermostat. The serpantine belt has a single groove on the smooth side. of course the car overheated. when i 1st started there was loud screaching sounds coming...

Sounds more like the water pump has locked up...try to spin the pump pulley...the thermostat could have been stuck closed initially causing the over heating, and hose explosion...The serpentine belt will usually immediatelt become contaminated and wear out as anti freeze drenches the pump pulley, and belt...Hope this helps your diagnosis.

Feb 11, 2011 | Ford Thunderbird Cars & Trucks

1 Answer

Where is the crankshaft on a 99 jeep cheeokee 4.0

The crankshaft is the main shaft that all the pistons are connected to by connecting rods. It is an internal part with both ends sticking out. In the front, the crankshaft pulley is bolted to it and it rotates when the engine is running, making the belt run around the pulleys for your power steering, and alternator to charge the battery. At the back is where the flywheel is attached. Your starter engages this to start the whole thing in motion. Your transmission is attached to the flywheel by a "torque convertor". the convertor converts the spinning motion of the engine(crankshaft) into usable power through the gears to make your wheels spin and down the road you go!

Dec 31, 2010 | 1999 Jeep Grand Cherokee

1 Answer

Replace alternator

Remove or disconnect the following:
  • Negative battery cable
  • Right front wheel
  • Right fender splash shield
  • Accessory drive belt
NOTE The crankshaft pulley retainer has left-hand threads.

  • Crankshaft pulley
  • Alternator harness connectors
  • Alternator


Remove the crankshaft pulley to provide clearance—2002–04 3.0L

To install:
  1. Install or connect the following:
    • Alternator and tighten the fasteners to 18 ft. lbs. (25 Nm)
    • Alternator harness connectors
    NOTE The crankshaft pulley retainer has left-hand threads.

    • Crankshaft pulley and tighten to 74 ft. lbs. (100 Nm)
    • Accessory drive belt
    • Right fender splash shield
    • Right front wheel
    • Negative battery cable
  2. Start the engine and check for proper operation

May 12, 2010 | 2003 Ford Taurus

1 Answer

Need diagrams of 4 belt system 1987 chevy 350

back belt nearest the engine goes around the crankshaft pulley and the power steering pump
next belt out goes around crankshaft, power steering pump water pump and ac compressor
next belt goes around crankshaft water pump and alternator
last belt goes from water pump to smog pump

Feb 21, 2010 | 1987 Chevrolet R10

2 Answers

All belts came off , 1986 740 gle 4 cly. with air nedd to know diagram

On the 92, the belt closest to the engine goes around the power steering pump, water pump, and crankshaft pulley.

The second belt goes around the alternator and the crankshaft pulley.

The third belt goes around the a/c and crankshaft pulley.

Jun 26, 2008 | 1991 Volvo 740

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