Could be a number of things. Is your car attempting to turn over (whur-whur-whur sound) or do you not get any response at all when you turn the key. Things to check:
1. Battery partially drained(it takes alot more juice to start a car then to just power your accessories).
2. Ignition coil (provides electricity to your spark plug wires).
3. Distributor cap/rotor (sends this electricity to your spark plugs).
4. Fuel pump.
5. Electrical continuity, espcially grounds. Check to see if all your ground wires are fastened AND tightened.
Maybe the starter, had a problem with mine, got underneath and wiggled the connnection to the starter and would start, eventually I replaced the starter, no problems since.
You could also check the Neutral Safety Switch. This limits the vehicle to only start in Park or Neutral.
Headlights, since they require more power than the inside lights of a car.
Check headlights and dashboard lights first. If no/minimal power for the lights then replace battery.
to run your lights and accessories and maintain your battery between starts.
A broken wire, a dead battery.
check the ground to the engine block
Sounds like you need a new battery.
if you have no headlights the battery is dead or one of therminals is very corroded.
Headlights, interior lights, parking lights,Headlights, interior lights, parking lights,
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The battery stores just so much electricity. The lights use this electricity. Sooner or later the supply is depleted.
If you have no battery then you have no power.
Check your battery voltage with a voltmeter. Also check your battery grounds / battery connections for acid corrosion.