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DOUBLE CHECK that you have connected the battery the right way and haven't put the positive on the negative. This is sometimes a warning that you have the terminals the wrong way round. If the battery is fitted correctly check the fuses.
CHECK THE MARKINGS ON THE BATTERY + & - ARE GOING TO THE CORRECT TERMINALS
Make sure the battery posts and terminals are shiny clean and tight, and the battery is fully charged, Leaving the light on will not harm anything only discharge the battery, sometimes a junction box is attached to the neg battery terminal for other cables make sure they are clean and tight .
Hello Kelving, my name is Andres and i will more than happy tohelp you with your problem the terminals are corroded? if soo clean them really good with water and wire brush make sure you clean them really good specially in the inside part of the terminal if necessary replace terminals and also if you bought a brand new battery sometimes they come with a covers on the terminals and believe it or not you connect the cables on top causing false contact last step to follow may be somebody or even you connect the battery wrong way and damage main fuse not a big deal just find it and replace it
It sounds like you have a major electrical issue or bad (shorting) battery. When you say it loses all power, you mean radio, lights, horn etc? Clean Battery terminals & look for ground wires that need to be cleaned & reattached. Check the black ground cable that goes to engine block. The more I type the more I think its a bad ground somewhere or the battery is shorting out inside the case. Good luck and I hope this helps you.
check the fuse if the fuse is good use a test light on the wire going to the horn if it lights up when you press the horn button then the horn itself is bad if it does not light up it means no power to the horn ,check fuses first ,and make sure the horn is grounded to metal, if you run a wire from the positive terminal of the batt. and touch it to the wire going into the horn the horn should work if not bad horn
Changing out the old battery, you may somehow shorted something out in the car. You can check this by seeing if you have any power going to the lights on the car and what ever else that uses the power when you turn on the key. Newer cars like yours usually cant short out, but if the lights and other stuff dont work when your check them, disconnect the battery and look for the fuse panel. Check ALL your fuses and make sure none of them have been blown. You can check that by seeing if the filament in them looks to be burnt or broken as if it popped.
You can also check and make sure that the negative battery terminal is on tight enough. Sometimes a bad ground can mess everything up. As your doing this, before your reconnect your battery, go under the hood of your car and disconnect the horn. This will allow you to work without the horn blaring. To disconnect the horn, its just a wire with an end that simply slides over a metal tab, just give it a pull and it should come right off. You may have two horns so check both sides of the radiator. Hope this helps!