fluctuating headlights

[kikoteng]

Hello Tsikoteers !

I am encountering a weird problem with my corolla 2000.

With the gearstick at neutral. At idle, my headlight is bright but it gets brighter when i step a bit on the accelerator.

Sometimes, while driving on the road, my car stereo suddenly lose power for about 1 to 2 seconds and comes back on. I've experienced a few times na biglang nag blink to off and then back on yung headlights.

The aircon fan is also weaker at idle. Mas malakas ang hangin when i am stepping on the gas.

Nag start lang ito within the past two weeks or so.

Any idea whats wrong ? Alternator problem ?


Thanks..

[jick.cejoco]

Hello Tsikoteers !

I am encountering a weird problem with my corolla 2000.

With the gearstick at neutral. At idle, my headlight is bright but it gets brighter when i step a bit on the accelerator.

Sometimes, while driving on the road, my car stereo suddenly lose power for about 1 to 2 seconds and comes back on. I've experienced a few times na biglang nag blink to off and then back on yung headlights.

The aircon fan is also weaker at idle. Mas malakas ang hangin when i am stepping on the gas.

Nag start lang ito within the past two weeks or so.

Any idea whats wrong ? Alternator problem ?


Thanks..

kikoteng,
check your power sources: your battery and its terminals, check the alternator output. with engine at idle, vehicle at rest, load up with the headlights on and observe the system voltage at the battery terminal cables. then unload the headlights to verify a change in the system voltage. or check with the last electrical component that had ben disrupted or disturbed. the head lights flicker maybe?
jick

[kikoteng]

kikoteng,
check your power sources: your battery and its terminals, check the alternator output. with engine at idle, vehicle at rest, load up with the headlights on and observe the system voltage at the battery terminal cables. then unload the headlights to verify a change in the system voltage. or check with the last electrical component that had ben disrupted or disturbed. the head lights flicker maybe?
jick

correct ka diyan, the more appropriate title should have been 'flickering headlights' ... hehehe

Thanks for the input.

[speed unlimited]

Check also your Grounding system . Sometimes stock grounding get rust or install a grounding kit for better grounding . It helps in audio system , headlight and other accessory load to be stable.

[bambino]

most common cause is your alternator about to go so you might as well have the charging system checked by the pros.

common alt problems of this scenario are rectifier , stator windings

[n5110]

try niyong dalhin sa mga reputable battery shops, libre naman ang padiagnose dito. madali nila ma chcheck kung battery or alternator ang problema coz they have the proper tools to check this.

[kikoteng]

kikoteng,
check your power sources: your battery and its terminals, check the alternator output. with engine at idle, vehicle at rest, load up with the headlights on and observe the system voltage at the battery terminal cables. then unload the headlights to verify a change in the system voltage. or check with the last electrical component that had ben disrupted or disturbed. the head lights flicker maybe?
jick

jick.cejoco,

Regarding check voltage at the battery terminal cabes, if there is a change in the system voltage, does that mean the alternator is ok ?

Thanks.

[jick.cejoco]

jick.cejoco,

Regarding check voltage at the battery terminal cabes, if there is a change in the system voltage, does that mean the alternator is ok ?

Thanks.

kikoteng,
it depends, what was the voltage with engine at rest? what was the voltage with the engine running? what was the voltage with the engine running and loaded with headlights? publish your numbers please.
jick

[kikoteng]

Hello Jick

First thing in the morning
with engine off
- headlight off 12.4 Volts
- headlight on 12.0 volts

with engine on
- headlight off 14.4 volts
- headlight on 14.4 volts
- headlight on, aircon on 14.4 volts



After 1 hour driving
with engine on
- headlight off 14.0 volts
- headlight on 12.9 volts
- headlight on, aircon on 12.5 volts

with engine off
-headlight off 12.6 volts
- headlight on 12.2 volts


Are the numbers healthy ?

Thanks in advance.

kikoteng,
it depends, what was the voltage with engine at rest? what was the voltage with the engine running? what was the voltage with the engine running and loaded with headlights? publish your numbers please.
jick

[kikoteng]

Hello all !

Can anyone tell me if the voltages I posted above are normal or needing repair ?

Thanks in advance.