Big Q Auto Repair at 2501 Pacific Coast Highway, Signal Hill, California.

These guys are great. When my alternator died on a Sunday, they were the only folks open. They fixed it same day and did some other stuff. When the alternator failed again, they honored the warranty, tested my battery, escorted me to AutoZone to collect on the battery warranty because it died too...they did the work free of charge...they answered all of my questions, informed of things I didn't even ask, and the entire staff was very courteous and approachable. They are not close to my house and kind of close to my work, and I will preferentially return to this shop for future work. I have no complaints, these folks are great.