I was swapping a standard outlet in my kitchen out for one with USB ports in it. When I cracked it open, I noticed the existing outlet had 4 hot wires on it (2 black connected to the upper hot terminal and 2 red conncect to the lower hot terminal), with one white and a ground (See Photo) I opened the other outlets around my kitchen and it appeared they were all wired this way in series.
The new USB outlet only has one hot terminal. Initially I pigtailed all four of the hot wires together and attached to the new hot terminal. I flipped the breaker on and it overloaded.
Next I removed the two red wires from the pigtail and twisted them off together without connecting them to the new outlet. Then I connected only the two black in pigtail to the hot and everything seems to work fine now.
Does this seem OK? Any advice? Thanks for the help]1