Intermittent Battery Light. Voltage is fine.
Ok so I have been wearing my eyeballs out for 2 weeks reading up on this one. I've read Cliff's troubleshooting flow chart and wiring diagrams and ran the checks. ALL is fine. No corroded connections, fuses and links are good. Grounds clean etc. So here is my story, which is different than other examples I have found on the net.
Symptom: Battery light comes on and goes off randomly. Might stay on for 5 minutes, might stay on for 2 hours. NEVER does it from a cold start or during short trips. ONLY happens on long trips.
Car has never stopped running or had problems starting.
I have my GPS hooked up with the Gauges display and the voltage is a solid 14.2 volts or so. NEVER lower than 13.8V and up as high as 14.5 volts. Same voltages when light is on or off. It reads this off the OBDII port via Bluetooth.
Battery 1 year old measures 12.5V static and 14.3 volts with car running.
All connections super clean and tight.
I've followed the flow charts and everything seems good.
What I HAVE NOT done is load tested anything.
I don't trust these big box stores to not short something out and make things worse.
NOW here is the ONE clue that might be the key to the puzzle. When the light does come on, it SEEMS to me that I am accelerating strongly, like getting on the highway AND only with a hot car.
Bumps do not turn the light on BTW.
The gauge nor the voltage read out on the GPS which comes from the OBDII port does not fluctuate when the light comes on.
Like I said, this is a weird one.
So, before I waste $200 on an alternator, anyone have any ideas?
Like I said, strong acceleration seems to aggravate it, but not all the time so I may be providing false information here.