Checked battery and charging system and it was fine
Charging system checked out fine but still cant leave lights on for more than 10 min without resulting in having to jump start the truck,i am just going to replace battery on my 06 larriot 150 5.4 and see if that solves the problem,otherwise truck starts right up even with this 9 degree mornings i just cant leave accy or lights on for more than 10 min.
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Either the battery is a dud, (cant retain a charge) or the alternator is not charging possibly due to a wire not connecting or wires incorrectly connected or both. Check voltage at the alternator (large terminal) without motor running, should be around 12 to 13 volts
Likely you are draining the battery with your system use during the car operating. This drag down of the battery means that your alternator may not be working properly. Check the alternator to see if it is putting out voltage. Otherwise check the battery during operation to see a higher voltage on the terminals if it is getting charge from the alternator.
is the security light still on? a quick test is to remove the negative terminal on the battery for 10 minutes. reconnect and see if car starts without the security light on. if the light remains on turn the key to ON without starting engine and leave it for 10-15 min until light goes out and then start the car, it should then stay running when you open the door. the late 90's into 2000's GMs have issues with their security systems acting up, unfortunately your car is one of the ones it affects.there is no way to disable the system because it is part of the ECM always unlock driver door first when using the key, there is actually a sensor that the computer reads, if the door is unlocked without a key such as using a slim jim or coat hanger the system will trigger a no start and the light will be on.
well...whenever the battery light comes on in a vehicle its almost always a charging problem,i would suggest replacing the alternator and charging the battery before starting it,alternators were meant to keep a battery charged NOT charge a battery, hope this helps
You are describing a situation that would be solved by a replacement alternator. You say yours is fine ... I think I'd be inclined to have it checked by another mechanic.
The battery light comes on when you are using more power than you are making. Your car died because it had no electricity to run the spark plugs, the electric fuel pump, the computer, the lights, the instruments, the cooling fans, the security system, the automatic locks, the heater/AC - ventilation system, and other electrical powered devices required to make a modern car run.
In the good old days, a battery would run a car for weeks, in the day time (no lights) - with the only power requirement was the starter and the ignition. Today - cars are power hungry.
Yes, your car ran out of power last night and this morning it strarted fine and ran for a while. That was because your battery has SOME capability to recover overnight. Don't push your luck. Have an evaluation done by a professional mechanic.
If your battery cables are corroded, I'm talking inside the casing , your battery is running the car and not getting much charge back from the alternator. The least expensive, but time consuming thing to do is replace both battery cables. Try this before any major repairs.
Have the charging system checked out .
Have the battery load tested first.
If you want to do this testing yourself its pretty easy.
a) need a fully charged battery (charge battery 3min charge)
b) you need special equiptment to do a load test so the next best thing is open circuit test. Use a DVM
and hook it up to battery you should have min. of 12 volts. if not charge battery or replace it.
c) Leave DVM on battery start car and measure voltage with all accessories on and off should be between 13.5 and 14.5 volts.
If this is ok you know the alternator is charging that battery .
If you don't get 13.5 to 14.5 turn off vehicle and start looking at battery cables and wires behind the alternator for corrosion.
If cables are good and wires behind alternator are good then replace alternator.
your first three words...battery checks ok....??? See why its difficult to do this from my end? Anyhow, here are a few suggestions to keep new battery OK. If you like to sit in parking lots (or other places) with the radio on, put a small battery charger on your battery every month or so to bring it back to fully charged. If you run the battery down by leaving anything on (key, dome light headlamps, and need a jump to start, charge the battery with charger also, as soon as you can. Reason is, your alternator is not designed to charge a battery. It's purpose is to maintain the state of charge in the battery. Though it may seem OK after a jump and drive, it will never again have a deep charge unless you put it there with a charger. This also overworks the alternator. So aside from keeping it clean on the outside, if you follow this rule it will be happy on the inside and give you even longer than its expected service life in return. Good luck with your car!!