Battery or alternator

**kinyo** · July 10th, 2012 02:09 PM

try checking the belt too ... a loose or slippery belt may also cause above symptoms

**Bin Diesel** · July 10th, 2012 02:23 PM

How about your RPM while idling? Does it drop significantly as well when you turn on all accessories?

**Retz** · July 10th, 2012 02:27 PM

Replaced your battery with a new one. If this happens again, then either your alternator or a connection/grounding issue that is draining your battery.

**mcbry** · July 10th, 2012 02:44 PM

have your battery and alternator check.
even at full load your battery must be at around 13.5v - 13.8v

**willvill2** · July 10th, 2012 10:28 PM

Originally Posted by CVT

The headlights are a big drain, bro.(delta of 1.3V).... From the normal 55/60W,- did you upgrade to 100W or higher? But then again, you said you upgraded it a year ago.

It looks like you need to have your alternator checked...

16.2K:bat:

I will start with my battery. I'll have it tested black and blue. I upgraded to 100w.

**willvill2** · July 10th, 2012 10:31 PM

Originally Posted by kinyo

try checking the belt too ... a loose or slippery belt may also cause above symptoms

Right. Sometimes I hear slipping belt but only sometimes.

**willvill2** · July 10th, 2012 10:32 PM

Originally Posted by mcbry

have your battery and alternator check.
even at full load your battery must be at around 13.5v - 13.8v

Correct. It really points to the alternator.

**willvill2** · July 10th, 2012 10:35 PM

Originally Posted by Bin Diesel

How about your RPM while idling? Does it drop significantly as well when you turn on all accessories?

I could not sense any significant drop, bro.

**willvill2** · July 23rd, 2012 07:22 PM

And so I went to my favorite electrical shop (dyan sa may kanto kanto). After the alternator was disassembled, we noticed that there was nothing wrong. The stator was sanded bright and clean and the alternator was returned to my crosswind. The repairman even disconnected the battery while the headlight and aircon were running to show that the alternator was working.

In the final analysis, there was significant improvement but I'm not yet 100 per cent sure.

**willvill2** · July 25th, 2012 09:25 AM

For further tests, I attached my multimeter to the cigarette lighter port so I can monitor the alternator's charging. With the aircon and headlights on at idle, the alternator could not go higher than 12.5 volts, it keeps going down. But when I keep my crosswind travelling, the voltage goes to 13.5 volts and stays there. My test also showed that if the rpm stays at 1k, the alternator can handle all the power requirements adequately. So I consider the alternator's problem solved. I spent just 200 php for the cleaning of the stators contact with the carbon brush. Cleaning came exactly 10 years from the time the car was first bought.