Sounds to me like you fried your electrical system your best bet is to take it to an automotive electrical specialist and let them know what happened and see if they are able to fix it for you
Sounds like you blew the voltage regulator in the alternator so test for volt output while engine is running with a simple Walmart multimeter $10, the output should be 13-14.5 volts with heater fan on high and all lights on and engine running at idle, if not change alternator
Check fuses & realays sounds lik you have shorted one or 2 out & if none check wire from alternator to battery
Check all your fuses. you blew some. Some fuses are necessary to turn things OFF as well as on, so if you are lucky, replace all blown fuses (including the really big ones and fusible links near the battery) and it will be fine. If you are unlucky, components like the alternator or radio or lcd displays can be permanently damaged by a reverse short. start with fuse checks and see whats blown. when all fuses are good and all items have proper power, then see what still is bad.
You may have blown a fuse. If you can start the car, and you have a volt meter, check the battery voltage before you start the car and after it’s started. Should be 12v roughly before starting and around 13.8-14.4 while started. If the voltage goes below 12v your alternator isn’t charging the battery
SOURCE: 98 cadillac deville battery wont hold a charge
sounds like a 12V drain on the system, like a trunk or glove box light that won't shut off.> Could be many. many other reasons why. The way I would find the draining circuit would be to remove the neg cable of the battery. I then would connect a 12V test light between the neg battery TERMINAL and the neg battery CABLE. With a 12V drain the light will shine. I would install into the light a 9V battery powered recepticle to hold computer and radio station memory. Then I remove fuses 1 at a time, then reinstall, at the same time looking for the 12V light to go out. Hope this helps.
SOURCE: new battery and alternator. Battery still won't hold charge
Check all your fuses if you had a system failure it could have blown a fuse. I am not sure on your vehicle where the fuse is in the car or under the hood it could also have a relay. You can check your alternator by checking the voltage at the back of the alternator where the big wire bolts on. You should have 14+ volts at the alternator.
SOURCE: battery wont hold charge
HI. you may have a battery drain issue that is sapping your battery overnight.
Here is the procedure I use to isolate a battery drain. Remove negative battery cable from the battery. Using a 12-volt test light, hook one end to the negative battery post the other end to the negative battery cable you just disconnected. The test light will glow or "light" if there is a drain. If the "light or glow" is faint, that is probably normal draw for the clock or computer. If the "light or glow" is bright, then there is a large drain. That should be corrected. Now start removing and replacing the fuses one by one until the light goes out; that one will be the circuit with the drain. Remember to hold in the button in the door jam for the interior lights.
SOURCE: new battery, new alternator still won`t hold a
You must have a bad gound somewhere or faulty wiring. Your not able to get current from your new alternator over to your new battery properly.
Source could be poor or dirty conections, a corroded ground wire or a bad conector at the alternator itself.
SOURCE: Alternator wont stay charged.
Replace the large wire on the back of the alternator,with a new one,it comes off the back to the positive side of the battery,leave the old one on the alternator.
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Change battery you aborted out plates inside it
You shorted out plates inside battery
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