First of all, did you give the battery a full charge after you boosted it? You car alternator is not meant to charge a battery. It is meant to maintain the fully charged system that's already there. If the battery is dead and you are relying on the alternator to recharge it for you, it really puts a strain on the alternator causing early failure of that component and it never really fully recharges. Put you battery on a nice deep cycle low amp charge over night. When that's done take the battery to a NAPA or some other auto store and have them load test it to be sure it's not bad. Even if the battery is new it can have bad cells, I just went through this with mine also. As for the horn fuse, what else is tied into that fuse?other than the horn? If nothing then I would suspect that you have a shorted wire and something else in the car is crossed over to the horn fuse and pulling the battery down overnight. Was any recent work done on the car like stereo equipment installed or any device installed?
If the battery if not holding a charge, it might be time for a new battery (is it over 5 years old?).
SOURCE: My 99 oldsmobile alero started honking on its own
ok its one of 2 things
1- behind the steering wheel between the column,there is a part called the sir coil,it allows the steering to turn with out getting the wires inside tangled,,this SIR COIL could be bad and making contact when it should not and causing the horn to sound,,,,you would have to remove the steering wheel to remove this part and its easy to mess this up,i would rec a repair shop to fix this,
2-inside the steering wheel is the air bad,which also contains the horn buttons inside,sometimes the air bag swells up and gets hard and applies pressure on the horn buttons inside and cause it to soulnd the horn,,if thats the case you will need a new air bag,,,i would also rc a repair shop for this as messing with the air bag system you can set the air bags off just with static electricity,,,,
but one of those should be your issue i think,,,there is really not way to test those parts unless your a dealer,so i cant tell you horn to test it,you need the special load tools and stuff,,,
Take care
SOURCE: '99 Alero - Overheating, cooling fans do not come
Possibly a coolant temperature sensor problem.Try unplugging it an see if the fans will come on.
SOURCE: Horn went off when no
The horn contact is embedded in the outer horn pad
The change in the climate eventually shrinks the pad and the horn will go off by itself
Replace the horn pad is all that can be done
SOURCE: 2001 oldsmobile alero battery drain over night
Just pulling the fuses obviously isn't enough. There are many circuit breakers supplying power to various systems. You would have to have everything removed to completely remove any drain. Knowing the amount of the drain (connect an ammeter inline with one of the battery lines) would be helpful.
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