I have seen many inoperable bilge pumps have corroded crimp connectors mainly on the ground side, why? I have no idea but I have repaired many at our marina and for some reason the ground or -12VDC is usually the culprit. Also many times the wrong style of butt splice connector is used. Most failures seem to be the non sealing blue style. The heat shrink type butt connectors should be used along with heat shrink tubing. When making the repair make sure you cut the wire back beyond where the silver center conductor has changed colors from overheating.
Bill
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