Bilge pump switch trips breaker

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Splendid Isolation
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Joined: 9/13/20
Posts: 37
Bilge pump switch trips breaker

Hi all, 

On my 1994 Mk 1.5, the bilge pump switch on the panel is labeled with an Auto and Manual position. There is not an off position. When it's on auto, and I lift up the float switch in the bilge, it comes on as it should. 

However, if I put the switch in the manual position, it trips the 15A breaker on the panel. My solution thus far has been to not put the switch in the manual position, but I would like to fix whatever is causing it to trip.

Any suggestions on what/how I should test this?

Joe Bousquin
Sylbo
Hull 1337
1994 Mk 1.5, M35 AC
SF Bay

Joe Bousquin, San Francisco Bay
Sausalito Yacht Harbor
SV "Sylbo"
1994 Catalina 36 Mk 1.5, hull number 1337
M35A(C)

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Haro
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Joined: 11/7/14
Posts: 442

This is the wiring diagram fir the bilge pump.
Use a voltmeter to find the short that causes the breaker to trip.

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Splendid Isolation
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Joined: 9/13/20
Posts: 37

Hi Haro, I don't see any attachment or link. Thanks.

Joe Bousquin, San Francisco Bay
Sausalito Yacht Harbor
SV "Sylbo"
1994 Catalina 36 Mk 1.5, hull number 1337
M35A(C)

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Haro
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Joined: 11/7/14
Posts: 442

Oops, I goofed. I uploaded the wiring diagram.
Or visit here
https://www.google.com/search?q=how+to+wire+a+bilge+pump+in+a+boat+wirin...
 

Splendid Isolation
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Joined: 9/13/20
Posts: 37

Haro, Thank you! You've given me just enough to start my search, and test out my recently purchased multimeter! 

Joe Bousquin, San Francisco Bay
Sausalito Yacht Harbor
SV "Sylbo"
1994 Catalina 36 Mk 1.5, hull number 1337
M35A(C)

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