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you need to check the alternator charge rate as this is the sort of problems associated with a low charge rate , unfourtunately you will need the engine running to do this so get a voltmeter ready for when you jump start the engine and read across battery terminals if reads below 13 volts the alternator needs replacing ,check that the drive belt is tensioned correctly as this would make alternator give low charge,also will need the OBD codes reading after all this going on , the engine doesnt need to be running for this just ignition on ,will give codes for sensor/switch which might be out because of the starting/running problems
the alternator gets power on big wire battery voltage the wire runs to starter, fuse box .alternator fuse goes to automatic shut down relay to relay control in ecm/pcm the field wire comes from ecm /pcm to alt.other field goes back to automatic shut down relay back to charge battery . if not charging at alt. try new alt. and retest.
Sounds like you have a toasted battery or alternator. Have you performed a load test on the battery? Have you tried to charge the battery? First remove the battery and charge it externally from the vehicle. If the battery won't hold a charge, or won't hold a charge of 12 volts, replace it. Once you have the vehicle started, test the operation of the alternator. It should be putting out at least 13 volts back to the battery to keep it charged - if it is putting less than 13 volts or more than 16 volts, replace the alternator.
hello, if the vehicle ran with cable off one would ASUME alternator is ok! however, i bad diode in the aletnator would allow it to charge yet have a massive voltage draw as well, almost all of todays parts stores will do a free starting and charging test for you! ......ps a large voltage drop would rob your ignition of voltage causing your miss!.good luck, marty