2012 Low power when using a/c

[DoubleD]

Hi, thanks for reading. If I turn on my air conditioning while driving my manual 2012 I seem to lose some power. It's also dimming the lights, as well if I use the power windows. I've had issues going up hills using the a/c too. I've had some issues before with a low beam relay and fuse box terminal that seems to get wet and corroded. Right now the rotted out section has a piece of copper wedged in with lithium grease. Doing this mitigates replacing the fuse box terminal which seems difficult as I don't have much harness slack. I'm wondering if my electrical "bandaid" is effecting my a/c, or power in general. Is it possible to buy a stronger alternator for my car?

 

[scotman]

There are probably more bad circuits in that distribution box. The power is having a tough time squeezing past all the resistance.

 

[DoubleD]

I just ordered a cheap multimeter to test, thanks scotman! I'll report back after I do some homework about testing for bad circuits and doing the work