You hooked up the batteries in Series whch pumped allot of current thur the circuit..which probably fried the voltage regulator and probably blew the diodes on your alternator. you can have the alternator tested at an auto parts store.. but I'd replace the voltage regulator ( if its not part of the alternator ) along wth the alternator.. gpawlak1@rochester.rr.com
It got replaced by good morning america!
This may be a sign that your battery needs to be replaced. However, there may be other causes as well.
Make sure the battery cables are making good contact with the battery and are clean and tight.
check your battery connectins. you could have a bad ground
well if you do nothing the battery will stay full a long time . and if you leave the light`s on it will be empty the next morning[i speak whit experience] it has happend to me. but the car battery of my car has not been replaced for 190.000 km[117.800miles]
Solved... Only happened in the mornings with heavy dew. Cleaned and tighened battery terminals.
Have you had the alternator tested? Often a bad internal diode can drain the alternator overnight.
The battery that powers the CMOS and clock (PRAM and clock on a Mac) has died and must be replaced. On a PC this is usually a nonrechargeable coin cell (on a Mac this is usually a rechargeable battery connected with a short cable). Once this battery has been replaced the clock will function normally again.
check your battery connections
Morning's Wrath happened in 2005.
Same way you got undressed the night before, only backwards.
Something is causing a drain on the battery even with the vehicle off and nothing turned on. A good mechanic can do a drain test on the battery to see what may be draining the charge. A dead cell in the battery itself will also cause the battery to go dead. Disconnect the negative battery cable overnight and if the battery is dead the next morning it has a dead cell and must be replaced. If not look for a light that is on or a relay that is stuck.