Bumababa ang voltage kapag naka-on parking/head light

**EE100shiro** · July 5th, 2012 04:46 PM

Laspag na battery mo

**gtamp** · July 5th, 2012 05:03 PM

Originally Posted by jhnkvn

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.

ibig ko pong sabihin eh kapag naka-idle po , running for few minutes na eh halos bumaba sya ng 12.1 to 12.3 and kapag ni-rebolusyun umaangat din yung voltage pero hindi naman yung lalagpas 14V

so anu po yung standard/or common na ampere kapag naka idle? TIA

**CVT** · July 5th, 2012 05:26 PM

Originally Posted by 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

Wow! You have a 110A alternator pala e... More than enough iyan, dahil 80A should be more than enough capacity na.... Unless, it is not really a 110A alternator....

If you are reading 13V with your A/C and other accessories on,- then you should be okay.

Now, let's run through the other accessories:

Ano ang voltage reading with your park lights on?

Turn on your foglamps,- ano na ang voltage reading?

Turn on your headlights(low beam) - ano ang voltage reading?

Turn on your headlights(high beam) - ano ang voltage reading?

Put in your measurements and we can probably localize where the problem is....

16.1K:nerves:

**gtamp** · July 5th, 2012 05:29 PM

Originally Posted by 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.

thanks

so far evrytime check ko langis, coolant at fluid eh sabay ko namn nachecheck yung higpit ng mga terminals ng battery at mahigpit namn. wala akong ammeter so hindi ko macheck pero considering na hindi normal ang current draw, it is a cause po ba para bumaba yung voltage ko kapag naka on yung parklight at headlight ko?

from 75A to 110A yung alternator ko, then yung mga nadagdag lang namn eh aux. fan for radiator and main condenser, subwoofer, foglight, power window motor and cabin blower.

just wondering kase everytime lang na naka-on yung parking light at headlight saka halos 1V yung ibinababa ng voltage pero kapag hindi naka-on eh wala pang 0.5V ang ibinababa so kung naka-on lahat from 13.8V - (1V + 0.5V) = 12.3V which parang hindi enough to charge the battery during idle

**gtamp** · July 5th, 2012 05:42 PM

Originally Posted by CVT

Wow! You have a 110A alternator pala e... More than enough iyan, dahil 80A should be more than enough capacity na.... Unless, it is not really a 110A alternator....

If you are reading 13V with your A/C and other accessories on,- then you should be okay.

Now, let's run through the other accessories:

Ano ang voltage reading with your park lights on?

Turn on your foglamps,- ano na ang voltage reading?

Turn on your headlights(low beam) - ano ang voltage reading?

Turn on your headlights(high beam) - ano ang voltage reading?

Put in your measurements and we can probably localize where the problem is....

16.1K:nerves:

from 13.8v~14.1V * idle - running for few minutes
switch on A/C = 13.3~13.5V
switch on fog lamp, stereo with subwoofer 13.0~13.3
switch on parklight 12.6~12.8V
switch on headlight low beam 12.3~12.6
then high beam 12.1~12.3
more or less ganyan ang read out
pero if I able to resolve yung pagbaba ng voltage kapag nakapark light at headlight eh good enough na sa akin para atleast yung minimum voltage requirement eh ma-meet para maganda ang charging eh

maraming salamats uli

**CVT** · July 5th, 2012 05:45 PM

Actually, for as long as the voltage measurement is >12V,- your battery is charging. Anyway, you're not idling all the time, so when you're rolling, the battery is charging correctly.

Please respond on the step by step measurement and hopefully, we can localize where the issue is....

Ano ba ang power rating ng iyong foglamps at headlights(low/high)?

16.1K:nerves:

**gtamp** · July 5th, 2012 05:49 PM

Originally Posted by EE100shiro

Laspag na battery mo

ask ko lang po kung anu basis para masabi na laspag yung battery, like anu simtomas?

yung pagbaba po ba ng voltage is one of the simtomas?

2x ko na kase sya dinala sa battery shop to check and so far ok daw can hold the charge and maintain the voltage

thanks uli

**CVT** · July 5th, 2012 05:50 PM

Originally Posted by gtamp

from 13.8v~14.1V * idle - running for few minutes
switch on A/C = 13.3~13.5V
switch on fog lamp, stereo with subwoofer 13.0~13.3
switch on parklight 12.6~12.8V
switch on headlight low beam 12.3~12.6
then high beam 12.1~12.3
more or less ganyan ang read out
pero if I able to resolve yung pagbaba ng voltage kapag nakapark light at headlight eh good enough na sa akin para atleast yung minimum voltage requirement eh ma-meet para maganda ang charging eh

maraming salamats uli

When you're idling, you can probably just engage your headlights(low beam). No need to turn on your foglights... How's your voltage measurement here?

Also, the compressor cycles on/off,- how is the voltage measurement with the above condition when the compressor disengages?

16.1K:nerves:

**CVT** · July 5th, 2012 05:53 PM

Originally Posted by gtamp

ask ko lang po kung anu basis para masabi na laspag yung battery, like anu simtomas?

yung pagbaba po ba ng voltage is one of the simtomas?

2x ko na kase sya dinala sa battery shop to check and so far ok daw can hold the charge and maintain the voltage

thanks uli

Bro.,- when your engine is running,- it is the alternator that supplies the voltage... The battery is practically out of the circuit.

The battery is mainly there to crank the engine when you start it.....

16.1K:nerves:

**gtamp** · July 5th, 2012 05:55 PM

Originally Posted by CVT

Actually, for as long as the voltage measurement is >12V,- your battery is charging. Anyway, you're not idling all the time, so when you're rolling, the battery is charging correctly.

Please respond on the step by step measurement and hopefully, we can localize where the issue is....

Ano ba ang power rating ng iyong foglamps at headlights(low/high)?

16.1K:nerves:

thanks po uli, sa ngayun hindi ko po masabi as per your sequence ng checking.. foglamps not sure kung anu power rating pati headlight.. ill find out yung sa fog lamp pero yung headlight eh stock pa din 55W