Unless the machine screws for the pump mount and the ground wire are threaded into the metal plate, you should consider they are electrically attached to only the paint. Sheet metal screws don't count as electrical terminations either, must be tapped machine threads, preferably 32 TPI.
Moving the ground wire to the pump mounting ear may not make a difference in the current round of troubleshooting but it will certainly be a much better electrical connection.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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