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Year/make/model?? Try disconnecting the electrical connector at the master cylinder to see if the light goes out. If it does, suspect a float issue in the reservoir. If light stays on, disconnect plug at park brake to see if it goes out. If it does, suspect park brake switch issue
you need to check a lot of things (1) make sure the battery terminals are clean and tight the battery side and the starter motor side and engine ground must all be cleaned you can use w d-40 do not use a battery brush or sand paper this will make the post on the battery and the cable terminals to small on the post and to big on the terminals resulting in a very loose fit they must be very tight so the electrical current produced by the alternator can go back into the battery to keep it charged (2) check to see if your alternator is charging by using a volt meter on the battery post while the car is running or simply start your car and then disconnect the battery cables if your engine stays running the alternator is working then while still running turn on all accessories ex. a/c heater headlights wipers rear defroster if the engine shuts down your voltage regulator is no good or you have blown diodes inside the alternator and it can not handle the accessory load this happens a lot from jump starting another vehicle that has gone dead but has a good alternator when the other vehicle is started now the other cars alternator voltage is being pushed back to your alternator and of course this is to much power coming in and it blows your diodes (3) another problem could be your alternator belt or tension adjuster you can check this with the engine off keys out of the ignition battery disconnected for safety reasons press down on the alternator belt wear the tension adjuster is this looks like a arm that extends out with a pulley on it that the belt goes around if this moves very easy when you try pressing down on it with hand pressure or by using a ratchet wrench in the square socket on the adjuster itself ? a lot of up /down play in it = its no good/ it should require you to use a lot of force to get it to move which will = a good belt tensioner (4) the belt itself has a fabric on the inside if it is gone the belt will slip and sometimes you will hear high pitched squealing of the rubber slipping on the pulleys (5)check all the pulleys for oil or antifreeze that could be leaking on to them causing the belt to slip a slipping belt will cause the alternator to not turn the proper revolutions to produce the power that is needed to go back into the battery from the alternator so this will drain the battery and cause it to go dead (6) you must check that all components are off if you have anything hard wired to the battery or constant 12volts on the fuse box you must make sure it is off (7) check to see if your brake lights are staying on after you leave the vehicle this will make the battery go dead from a bad brake light switch on the brake pedal under the dash if you look under the dash at the pedal you wo=ill see a switch with spring on it and a electrical plug connected that when you press the pedal the brake lights will come on and go off when you release the pedal (8) if all these things are good and you still have this problem there is a short in the vehicle causing a drain on the battery overnight or while the car is being driven this can happen from jumping wires to other circuits .I tried to give you all the possible problems that could cause this without seeing the vehicle in person so be careful and good luck LATER MAN!
Replace the alternator,and clean the battery cable ends real shiny,no grey,or black film left on the cable ends that connect to the battery.Alternator does not have enough power to run the ignition and all it`s assesories.
you only set base timing to 15 degrees BTDC (before top dead center).
CAUTION: Parking brake control should be applied. Depress the parking brake pedal, and warm the engine to the normal operating temperature.
Turn off all electrical loads.
Rev the engine to 2000-3000 rpm two or three times and allow the engine to return to the idle.
Turn off the engine and disconnect the throttle position sensor electrical connector. (not really necessary)
Start the engine and rev it to 2000-3000 rpm two or three times and allow the engine to return to the idle.
Check the idle speed. The idle speed should be between 700-800 rpm in PARK (P) or NEUTRAL (N) position.
NOTE: Make sure that the timing pointer is pointing to the 15° Before Top Dead Center (BTDC) mark on the crankshaft pulley. Each notch on the crankshaft pulley represents 5 degrees. Check the ignition timing with a timing light.