Originally Posted by quanchai
well i just tested the cap and i got a reading of 33 uF on the cap it says 40 uF do you thing this is why there is 3 amp extra current ?
Most likely. There should be a +/- percentage number stated on the cap as well, right next to the 40uf. It would look something like +/- 6%. That number could be different than 6, I'm just using that number as an example.
At 10% (just a max percentage on average run caps but usually much bigger ones) less than 40 which is 36 uf the cap would be at it's weakest to assist the motor in it's normal operating range. You are well below 10% at 33 so your motor is struggling.
6% less then 40 (which is 2.4) would be 37.6 so anything lower than that would cause the motor to struggle to run. You get the idea.