A 1527 can pull a lot current which heats the connectors. Several possible causes and fixes.
A loose connection between the male and female connectors will lead to heating and unsoldering of the terminals. Use a pair of needle nose or something like a conical body reamer to gently open the male side fingers up. This will add more spring tension and reduce the self heating of the connectors.
A large gap between the wire diameter and the solder cup on the connector will also lead to increased resistance and self heating which results in solder flow. Try building up the wire diameter by taking solid core copper hook up wire and wrap it around the magnet wire coming from the motor or ESC. This builds up the wire diameter making the solder gap smaller. "Hook up" wire is commonly available from electronics supply houses in a variety of wire diameters. I bought about 8 different sizes to be able to build up motor wires to fit snugly into 8mm bullets.
Tyler Garrard
NAMBA 639/IMPBA 20525
T-Hydro @ 142.94mph former WR
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