Question about 1998 Ford F250 SuperCab

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98 F 250 draing power when off. No problem when running/alternator putting out 14.8 and battery holds chrge when disconnected.

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Still sounds like a alternator issue,maybe grounding out at 1 of the brushes,try hitting the alternator with a hammer ,not really hard to break it,and see if it helps,if it does replace the brushes,which are usually about $25.00-$35.00,if it doesnt charge anymore then the brushes are bad.usually alternators go about 200,000 miles with no problems

Posted on Sep 27, 2009


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How can I check when the alternator is not supplying enough power to the battery,or when alternator drawing power from the battery I remove one terminal while the car idle it did n't die.I suspect

The alternator output must be more than 12 volts, usually +/- 14 volts. Measurements may be made with the engine running connected/unconnected to battery. Once the engine is running, disconnecting the battery will not normally cause the engine to die/stop. However, lights, radio, clock, and other accessories will not have power.

Oct 10, 2015 | Cars & Trucks

1 Answer

How do you figure out the amount of amp your altinator need to put out to run a multi amp car audio system

Your amp will have a peak and steady wattage specification. Then the formula is Amps = Power/14. You can make an estimate of peak and steady amps from that. It is worth noting that at a lowish voltage like 12V, high power produces high currents.

The job of the alternator is to charge up the battery, which you would know. Once the battery is charged up fully the alternator is effectively disconnected by the regulator. So to prevent the battery from running down in use the alternator needs to supply enough current to your audio amps, plus enough to run the car as well.

A typical alternator in a medium size car can produce about 14V and 50-70A, This is regulated to about 10A at 14V. So if your audio amps pull about 5A they would be developing about 5 x 14 = 70 watts steady. Peak power spikes can be buffered by the battery. Most car audio systems are nowhere near this powerful.

Mar 25, 2015 | Cars & Trucks

1 Answer

Said alternator was bad

Bad alternator means no battery charge. Run the battery down without a charging means no power and engine will die. Charge the battery and put a meter on it to see if it goes to 14 volts with engine running. If stays under 13 volts with engine running, replace the alternator.

Sep 25, 2014 | 2001 Mercedes-Benz CLK-Class

1 Answer

Saab 93 1.9 tid warning battery not charging car died whilst driving charged battery at home car now starting lights all out is this battery prob or alternator?

The easiest way to check is with the car running, disconnect the positve side of the battery, if the car dies, then it is the altenator, if the car keeps running then it is the battery. If you have a volt ohm meter, check the chrge going to the battery you should get between 12 and 14 volts if it is lower than 12 you have an altenator issue. the altenator should always produce enough to charge the battery and run the car at the same time, if not then the battery wears down.

Mar 13, 2011 | 2004 Saab 9-3

1 Answer

My battery is fully charged, the alternator is new. if i disconect the battery the truck will shut down....What do i need to check for???

First off, never disconnect battery when vehicle is running. It could stress out the alternator and blow the diodes. Now you need to put a volt meter on the battery while the vehicle is running to see if the alternator is putting out 14 volts. If its putting out 12 or less, you have likely blown the alternator. Remove alternator and have tested free at Orielys or napa. I dont trust autozone.

Oct 09, 2010 | 1995 GMC Suburban

3 Answers

How can i tell if my starter is going bad? I had

It may not be the starter. The battery could have a weak or dead cell in it and not holding a charge.
The alternator could be bad and charging the battery.
If you have a volt meter, or can get one, with the car running, put the leads from the meter to the battery terminals, red positive, black ground.
Put the meter switch to 12 volts. If the meter reads 14 to 15 volts, the alternator is ok, below that it isn't charging. If it does read 14 to 15 volts, replace the battery.
By the way, the starter is ok, or it wouldn't have started with a jump.
It's more a battery/alternator issue. Clean the battery terminals first and see if that makes a difference.

May 11, 2010 | 1999 GMC Jimmy

2 Answers


altenators have to be running a 13.5 volt charge to be good

Mar 12, 2010 | Cadillac Eldorado Cars & Trucks

3 Answers

How do I remove the alternator from a 2002 V6 Hyundai Sonata once I have disconnected the alternator?

  1. Remove or disconnect the following:

    Negative battery cable Radiator mounting bolts, 1.6L only Alternator drive belt Alternator wiring harness connectors Alternator. It may be necessary to raise the radiator


Fig. Exploded view of the alternator-XG 300 and XG 350

Removal & Installation
  1. Remove or disconnect the following:
    Negative battery cable Alternator drive belt Alternator wiring harness connectors Alternator. It may be necessary to raise the radiator 5ead6d5.gif

  2. Fig. Exploded view of the alternator-XG 300 and XG 350

  1. Before servicing the vehicle, refer to the Precautions section.
  2. Remove or disconnect the following:

    Negative battery cable Radiator mounting bolts, 1.6L only Alternator drive belt Alternator wiring harness connectors Alternator. It may be necessary to raise the radiator


    Fig. Exploded view of the alternator-XG 300

    Fig. Exploded view of the alternator-XG 350

  3. Install or connect the following:

    Alternator and reposition the radiator, if raised Alternator wiring harness connectors Alternator drive belt
  4. Adjust the alternator belt and torque the bolts to the following specifications:
    1. Accent: Pivot bolt to 14-18 ft. lbs. (19-25 Nm) and adjustment bolt to 14-20 ft. lbs. (19-28 Nm).
    2. 2.0L and 2.5L Sonata, Elantra and Tiburon: Pivot bolt to 14-18 ft. lbs. (19-25 Nm) and adjustment bolt to 105-132 inch lbs. (12-15 Nm).
    3. 2.4L Sonata: Pivot bolt to 26-41 ft. lbs. (34-54 Nm) and the adjustment bolt to 14-18 ft. lbs. (19-25 Nm).
    4. 3.0L Sonata and XG 300: Pivot bolt to 14-18 ft. lbs. (19-25 Nm) and adjustment bolt to 11-16 ft. lbs. (15-22 Nm).
  5. Install the radiator mounting bolts, if removed.
  6. Connect the negative battery cable.

I hope hrlp you with this. Good luck and remember rated this help-

Aug 25, 2009 | Hyundai Sonata Cars & Trucks

1 Answer

Low voltage

what is the condition of the battery cables you are probably onto something about a ground but i dont think your ground issue is going to be at the batteries you may not have a good ground on the alternator. The next thing I would check is ... the alternator itself do you know that you are getting between 13.6 and 14.2 volts out of the alternator, a under charge or a overcharge condition both are bad for batteries.

I would check alternator output first if it is not within the above range you need to replace it

If the alternator is putting out in the range of 13.6 to 14.2 then you need to look elsewhere... you may have something draing the batteries overtime interior lights, electric brake controller for trailor brakes if equipped sound system if anything is getting power without going through a switched circuit this could also be your cause.

hope this helps

Aug 23, 2009 | 2002 Ford E350

1 Answer

Alternator and electrical problems ive changed alternator twice,now clicking noise under dash bat. light comes on and dash lights flicker

check all battey connections and system grounds. Check that the battery has 12v and holds properly when load tested. To check charging system, don't disconnect any battery leads...put a volt meter across the battery. when running, you should have at least 12.9v and volts should not drop. (usual reading is generally at or near 13) at idle with all accessories on voltage should be close to that as well. voltage should not exceed 14.Also make sure that drive belt is not slipping.

May 12, 2009 | 2003 Ford Focus

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