Garage electrical problem

The circuit breaker to my detached garage kept tripping. I traced the problem to an improper splice in the underground cable from the house to the garage. I fixed that with an underground approved splice kit. I double checked with a simple test light after the repair, and had power to the ends of the cable. But when I hooked the cable up to the garage wiring, nothing worked. I touched the test light to splices between the cable and garage wiring, and no light. Oddly enough, if I touch one lead of the test light to the common wire, there is a faint glow that goes out when I touch the other to the power wire.

The breaker does not trip, but there is no power when connected to the garage wire.

Apparently, there is a problem in the garage wiring (everything worked fine before the splice shorted out). Do these symptoms ring a bell with anyone. Any suggestions as to what to look for, other than to just disconnect the branch circuits in the garage one by one and track it down that way?