Super weird Charge light on issue...
 

Hi everyone,
My charge light is on, alone with oil pressure light, coolant light when I press the throttle.(Only when I press the throttle. The lights seems not related with rpm, but will not come on below 3000.) Some time the abs light also on. When I'm off the throttle, all the lights will gone. When the lights are on the pfc shoes the voltage reading is around 14.8. Rebuilt the alternator, new battery 4 months ago.
The car is running perfectly, idle great, nothing is wrong beside the light are on some time. The pfc shows the voltage is always above 14v.
Any idea what may caused that? Thanks.

Take a multimeter and measure the voltage directly from the alternator. That will probably be a better read of the actual voltage you're getting. Make sure the terminal at the alternator is also clean. I've had alternator issues on another car where I was fortunate enough for it to just be a dirty contact like that.

Belt tension could also be an issue. Stock pulley? Under drive?

Matt

I checked the voltage with a multimeter at idle, shows the same reading with pfc, 14.2. The terminal is very clean, stock pulley and belt checked with tension gauge.
The problem doesn't match with loosen belt. Some time the warning light won't at all.
Maybe the warning light is the problem?