Question about 2002 Jeep Grand Cherokee
About 1 week ago my car would not start randomly after running fine for years. It would not even start with jumper cables. I thought it was my battery so I took my battery out and I connected a battery from my friends Toyota Avalon. When I attached the cables It immediately sounded off the horn and something started smoking from beneath the battery. I disconnected the battery right away. I took my original battery in to get tested and it checked out fine. My problem was that my ignition cylinder was loose and it wasn't getting a good connection when I put in my key. I replaced that and connected my battery and the car starts right up. The thing is now my battery meter reads just above the red at around 10 volts which I know is low. I'm pretty sure something happened when I tried connecting my buddys battery. And NO, I did not connect the Positive to the Negative and visa versa. The alternator in the jeep is only about a year old I cannot see that being the problem. What caused that smoke when I connected the other battery and what in the world do I need to do to get this fixed. It seems like there is something wrong with the connections. PLEASE HELP. THANKS!
Regardless of what caused the smoke it is apparent that your alternator is not charging the battery.
Check the alternator is properly grounded, and that the B+ terminal is connected to the battery supply.
Check the exciter terminal (usually labeled "IND") is connected to the "BAT" indicator dashboard lamp - check the indicator lamp lights when the ignition is on without the motor running.
Battery terminal voltage should be approx 14.5V when the motor is running, with a load such as headlights on.
Check the fusible link ( or in line Maxi fuse) and their electrical connections is in good order.
The alternator/regulator may have been 'spiked' as a result of a poor electrical connection while changing batteries. The fact that the horn sounded indicates that a voltage spike had likely occurred.
I suggest you fix the battery charging problem first, then pursue whatever other problems that may still exist.
Posted on Oct 08, 2009
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Posted on Jan 02, 2017
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