Question about 2003 Chevrolet Suburban 1500

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1. I have a 2003 Cheverolet Suburban 1500 LS. The car stranded my wife, the battery was bad. I replaced it with a new one hooked it all back up, took it to Auto zone so they could test the system( Battery, Alternator, Starter) The Device showed the Battery was bad alternator and start was good. I thought maybe it has been on the shelf for a while and needed to be charged, I gave it a day, went and bought a Volt Meter. I have about 12-12.50 on the battery with the car off, I turned the car on with both front and rear ac on, radio, and also headlights, Alternator showed 13.60 to 13.80 battery was matching pretty close. I noticed on the battery instrument cluster that it is constantley moving up and down from 12 volts to 14 volts regardless if it has a load or not. Funny thing is that the volt meter does not sway as much as what is seen on the instrument panel.. What is that about?? 2.The car will start no problems but sometimes at stop lights whle pushing on the brake the car wants to act like it is going to die? No messages on instrument panel nor info screen?

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It is quite possible that the battery connections , in particular the GROUND to the CHASSIS can be faulty / loose or poor contact.
You must clean BOTH the terminals and the main connection.
Now if there is a drain overnight check for leaks in the electrical system.
If the batttery is poor in the retaining of charge it is possible that the meter will keep going up and down as the battery charge is not settting it to stable state.
A check on the individual cells might shed some light if there is possible failure/weakness of one cells. If the battery is more than four years OLD then it is possible that the battery can be swapped to see if the fault condition changes.
Please check this link below for help:

http://www.fixya.com/cars/r5824824-draining_car_battery_charge

Posted on Nov 02, 2010

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Posted on Jan 02, 2017

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