Have fully charged battery but car will not start. It will start if I get a jump start from another car battery.

battery could be fully charged but it depends on the amps from the battery. try jump starting using another vehicle or a jump starter, if you try these and it runs faster and starts change the battery also make sure the battery is the compatible battery for your vehicle some time the wrong battery is fitted to the vehicle, check these out before checking anything else

The jump start may have blown you alternator or voltage regulator. If so, you have an inactive charging system. You must have a good battery for this to work, Disconnect the positive cable to the battery. Use a battery charger to slow charge your battery. When the battery is fully charged, reattach the positive cable and try to start your engine. If it starts take the truck to a shop or auto zone to have the charging system checked. Fix what is needed.
Any time a vehicle is jump started, do so with the hot battery car not running and its ignition off. If it is running and your car starts one or both charging systems are usually damaged. There may not be damage if it is GM to GM or Ford to Ford, etc., but to be safe, do not let both cars run at the same time when connected.

Start with the basics, here. Check that battery cables are not loose and are CLEAN, on the battery AND the starter. Beyond that, check the battery charge with a volt meter. Fully charged should be 12.5 volts or higher, you will lose starter spin at 10 volts. If the battery is low, hook it up to a charger and charge it up completely. If you don\'t have a voltmeter, go to the store and buy one. If you\'re going to try and fix things like this, you have to have one. If you can\'t do that, remove the battery and take it to someplace like AutoZone. They will charge and test the battery for free. If you can\'t take the battery out, or don\'t have a friend that can, have the car towed to your mechanic.



Here\'s the thing- I can\'t tell you exactly why, but some cars you just can\'t jump start. Happens more on side mount post type batteries. Because you can\'t jump your car doesn\'t mean it won\'t start with a fully charged battery. Now there are other things that could be wrong with you car, that it won\'t crank over and start for you.....but we begin the diagnosis with the battery.

Sounds like you need to get your battery fully charged on a battery charger and then tested at a garage. Driving will put some charge in your battery but not fully charge it. After your battery has been flat it is less likely to fully recharge and the alternator is designed to keep the battery topped up rather than fully charge it. Jon

Check cables,. SOund like you have a wire shortage, Somethng is drainin down battery. Have battery checked.

your starter is bad.

clean and tighten all your battery connections and fully charge it,, when you get it charged , have it LOAD tested, you may have a dead cell in it, once you know you have a good , fully charged battery ,, test the battery posts with a meter,, you should get a reading of 13.5 to 14.5 volts, if not, your alternator isn't charging correctly,, ( note,, use extreme care when jumping another car, a single back feed into your car could fry the computer,,

Sounds like a bad alternator. Drained your battery and when you turned on the lights it took all the power left in your battery. When you drain a battery down that far, they are real hard to jump, and coupled with the alternator, the car is not producing enough current to start and stay running.

I would take the alternator off and take it to oyur local auto parts store to be tested. If bad, replace it and charge the battery fully before starting. Then check voltage at battery with motor running. Should be 13.2 -14 Volts DC. If not, you may have a bad battery cable or blown fusible link. (especially that if the alternator tests good).....Mike

The click you are hearing is a relay. The cause can be that the battery is not fully charged allowing the car not to start. Try getting a jump start and the car should be fine. After the jump start if the battery does not hold charge replace it. After replacing the battery if it still does not charge then replace the alternator.

Good Luck

Belt turns alternator, alternator charges battery.(no belt, no charging) Charge battery with a charger. Though it may start with a jump, the alt is designed to maintain the state of charge in the battery, not to fully charge it . Therefore jumping puts too much demand on alt and can damage it. or will shorten battery life considerably.