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Question:

auto electricians and mechanicscant hold a charge!?

ok so recently my car will not hold a charge. i have to jump start it every morning before work. they tested it at auto zone and said the battery tested ok and the alternator was over charging (140 i think amps?) but after completely replacing the alternator its still doing it. its fine if im driving but when i hit my brakes or turn on my turn signal it drains the battery really fast and i have to floor it to charge back up. my bright light completely kill the car as soon as i hit the switch. and my dome lights keep staying oni cant get them offalso when i hit my turn signal all the lights in the car flash with them. today we found a slice in the battery cable. it was pretty bad but we fixed it as best as we could and taped it tightly. any suggestions as to what this could be? i deliver pizzas and need a decent running car. its a 1996 pontiac bonneville seit has the 3800 if that matters. i wasted money on the alternator so i dont want to buy a new bat unless i know thats it

Answer:

Just from the first few lines you have a Battery Alternator Problem! 1; Battery: if it's 3 1/2 to 4 1/2 Years Old or looks Swollen (Shorted) on the Sides Replace It. If it seems to be Good Remove and have it Fully charged then Load Tested for 15 Seconds at 50% of CCA not dropping below 9.6 Volts during the Test showing if the Battery will Take and Hold a Charge. 2; Sounds like the Alternator is Shorted and needs to be Replaced (Excessively High Volts and Low Amp Output!) 3; Excessive Output from the Alternator my have Damaged the Red Wire w/Fuseable Link between the Alternator and Battery, also Check the Battery Cable Condition and Secure Connections.
Chasing electrical problems can be a nightmare. You do have a short in your electrical system. First start by replacing the bad wire you found. Now look for other problems with the wiring from the battery positive (red) to the starter and negative (black) to the engine ground point. Replace any bad wire you find. Now on the electric draw with engine shut off. First get a good Volt Ohm Meter that will read amps. Remove the negative battery lead and using an algator clip hook the meter in between the negative cable and the negative post on the battery set the meter to DC amps. You will get a reading now pull one fuse at a time to see when the reading goes towards 0 amps, it wont go directly to 0 amps but you want the draw to below 60 milliamp. What ever fuse drops the load is the culprit now search that circuit to find the draw. Pulling the radio and PCM fuse will stop the drain but these are designed to use a very minuet amount of power. Your dome light may be the dimmer switch is turned to the dome light on position, try turning the switch and see if that turns the light off. If not then there is a short in the ground line from the dome light to the door switches. Be patient and don't rush or skip on repairs.
The boys on Car Talk have the old saying, It's the cheap man who pays the most for auto repairs. My suggestion would be to take it to a reputable shop and have the entire charging system checked. By the way, you might want to toss the batt. cable. The damage you observed was just the tip of the iceberg. Corrosion is always worse inside the cable. How old is this batt? If older than 4-5 yrs, you probably need to replace that also. And lastly, make sure they check the voltage regulator. Good luck
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