Bumababa ang voltage kapag naka-on parking/head light

[gtamp]

mga sir,

ask lang po ako ng expert/experienced opinion regarding sa pregio ko. Bumababa kase yung voltage kapag naka-on na yung parklight at headlight. from 13.8V to around 12.3V sometimes until 12.1V

Anu kaya ang nangyayari kung bakit bumababa? TIA

[raine]

pa check mo alternator, baka ma igsi na ang carbon brush

[CVT]

Your alternator cannot cope up with the amperage(current) requirement of your lights/accessories.

It is either inefficient now, in which case, it needs to be repaired. Or, not the right one, in which case, replace your alternator with the one with a higher amperage rating....

Or, check the wiring and the accessories,- they could be drawing much higher current than they're supposed to,- so the drop in the voltage.

16.1K

[gtamp]

sensya na po hindi ko pala na mention, yung pagbaba ng voltage eh kapag naka-idle and also just recently replaced the alternator from original of 75A to 110A (P6,000). hindi na kase nagkakarga kaya I decided na palitan na. kaya lang hindi ko naman sure kung 110A yung ipinalit basta sabi nila sa akin 110A yun. first time ko lang po kaseng magkaroon ng sasakyan kaya talagang wala akong alam. And then after replacement eh sabi ok na daw magkarga

anyways back sa bumababa na voltage, kapag ang aircon ang naka-on or yung stereo w/ subwoofer or yung fog light w/ separate switch eh hindi naman ganun kalaki yung binababa ng volatge from 13.8 to 13.4 or until 13.2 lang and palagay ko still enough para magkarga..ayon na rin sa mga nababasa ko dito

if wiring ang checheckin, panu po ang pagcheck? panu po ang basic na konenksyon or ng circuit ng parking light at headlight? kase sabi naka parallel lang daw ..tama ba?

salamats po uli..sana madami pang inputs/suggest

[userfriendly]

When your voltage drops to 12V, does it go up to 13.8V again or does it stay at 12V? If it goes up after a few seconds, I think thats normal. If it maintains at 12V then something is wrong.

[t2erns]

check the grounds. check the current (ampere draw, voltage test is not always accurate)

[gtamp]

yes it stay there during idle, then goes up kapag ni-rebolusyon. yes i think na there is something wrong kaya I decided to post it here to get more infos, ideas, inputs and suggestions kung anu/panu/bakit nangyayari yung ganun para bago ko ipagawa eh meron akong idea kung anu/panu dapat gagawin nung gagawa

panu kaya ang basic koneksyon nung parklight at headlight?

[gtamp]

check the grounds. check the ampere draw (voltage test is not always accurate)

sensya na po dami kong tanung, anung ground ang ichecheck? yung grounding ba ng parklight at ng headlight? yung mismo bang bulb socket?

panu po machecheck yung ampere draw? anu po yung common na ampere draw?

salamats po ng madami..

[jhnkvn]

yes it stay there during idle, then goes up kapag ni-rebolusyon. yes i think na there is something wrong kaya I decided to post it here to get more infos, ideas, inputs and suggestions kung anu/panu/bakit nangyayari yung ganun para bago ko ipagawa eh meron akong idea kung anu/panu dapat gagawin nung gagawa

panu kaya ang basic koneksyon nung parklight at headlight?

Well, with this we can rule out that you have a faulty alternator. An alternator does not give out a consistent amperes naman talaga.. it's an upward sloping in most cases. More RPM = more amperes. I would also note that you do not measure your voltage on a cold-start. Kasi talaga mababa yan the first few minutes. Mine stays at 12~V according to my voltmeter before rising to a consistent 13.8V

Unfortunately, I'm experienced about sa headlight amperes so can't help you there.

[t2erns]

first to check is the battery ground, check kung mahigpit at may good contact. kailangan mo ng ammeter para masukat ang ampere draw. at idling and na load lahat electrical mo makikita mo kung ilang ampere (current) ang nagagamit, but you'll need a little advance knowledge sa electricity kung normal ang current draw and you can compare kung kaya ng alternator mo issupply ang load demand.