Question about 1996 Isuzu Rodeo

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The car is not holdong a charge. I replaced the Battery about a year ago. Today I replaced the alternator. I used jumper cables it ran for about 20 minutes and then died again. All the wires look good. Any ideas

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FIRST, YOU MAKE SURE THE BATTERY IS FULLY CHARGED.. A GOOD BATTERY WILL GO FOR 12 HOURS EVEN IF THE ALTERNATOR IS NOT WORKING.. SECOND YOU TURN THE CAR ON.. ONCE THE CAR IS ON. YOU DISCONECT THE BATTERY,, IF THE ALTERNATOR IS GOOD , THE CAR SHOULD REMAIN ON WITHOUT A BATTERY.. IF IT SHUTS DOWN , YOU HAVE A BAD ALTERNATOR OR THE WIRING IS WRONG ONE OF THE TWO.. SHORTS ON YOUR WIRING CAN CAUSE THE BATTERY TO LOOSE POWER.. BUT NOT THAT FAST. BECAUSE IF THE SHORT WAS TO SERIOUS.. YOUR WIRING WOULD BE BURNED.. COMPLETELY..
IF THE ALTERNATOR IS OKAY,, REPLACE YOUR BATTERY,, MOST OF THE TIME BATTERIES GO BAD EASY WITH ANY LITTLE PROBLEM THE CELLS BURNOUT AND THEY DONT HOLD A CHARGE EVEN IF FULLY CHARGED THEY WILL LOOSE POWER IMMEDIATELY .. I THINK THAT IS YOUR PROBLEM.. SINCE IT ONLY LASTED LIKE 20 MINUTES.

Posted on Dec 14, 2010

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I will try and answer this. Most responses you will receive will have you looking for a drain in the system. Very well could be that.

But you said when Jumper cables are removed it does not charge. I have not heard of this in your Year of car, but witnessed it myself in a 2004 F150. There is a circuit called a "battery saver". Its job is to disconnect a battery drain to preserve the battery. What can happen is the Alternator uses power to make and generate even more power.

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