Newbiecampers wrote:
I checked the alternator voltage output at the starting battery and it was 15.3 volts right after start. I let it run for 1 hour and 20 minutes, checking around every 10 minutes, and it never went below 15.07-15.1, and that included around a 10 mile drive.
Ductape wrote:
The alternator is overcharging. If its warranted still, I'd ask for replacement of the batteries as well, as consequential damage directly resulting from the faulty alternator.
I concur with Ductape ! Much too high ! Something is the chassis wiring could be "tricking" the alternator, but it need to fixed soon. You have already "hurt" your batteries. Don't expect them to live a long life.
When you see acid stains/fluffy corrosion on battery post or cable end that mean that the battery is "outgassing"
(acid vapor, usually under pressure, is escaping from inside the battery). AGM batteries are not truly "sealed". They have a way of venting these gases if the pressure inside get too high.
At least once a year, all 12V lead acid batteries, including AGM, should be cleaned with a solution of baking soda and water applied with a "chip" paint brush. Continue to apply the solution until the bubbling stops, then rinse with fresh water.
