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Your battery is definately suspect.Give it a good charge and check it again. If it drops like that when you turn on the lights replace it.A fully charged battery in good condition will read about 14.2V when fully charged. When you turn the key to start it will drop to about 11 and come back up when you turn the key off.
Fully charging a bad battery is a waste of time as the bad cell discharges internally. Best have a load test done on the battery to eliminate it first.
How do you know the battery is good, fully charged may not be the case if the battery has a failed internal post connection. Have the battery load tested at a shop or a parts store.
Hi, Sorry to hear your having trouble, First let's get brake lights to turn off. For now - just remove the bulbs DO NOT DRIVE THE CAR LIKE THIS - -this is just for repair purposes.
Now be sure the battery is fully charged. Install the battery and turn the head lights on. They should be VERY BRIGHT. If the battery is truly charged to it's fullest.
You do not say what kind of car so I will post this and ask you to confirm you are attempting this much - please do this and get back to me:
1- Place the fully charged battery in the automobile. 2- Set the emergency brake at it's fullest 3- With all lights off and the brake light bulbs removed [ for test purpose] 4- Place the transmission in neutral 5-Turn the key and start the vehicle. 6- Get back to me with further comment or question.
The problem is most likely the starter, but you should ensure that the battery is fully charged before proceeding. The battery doesn't need to be fully charged to run just about all the interior lights and the head lights, but attempting to crank the engine is a large current draw, and can drop voltage quickly on a partially discharged battery.
If the battery is fully charged, continue to checking the starter.
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