1993 Glasstron SSV 195 with Penta 432A relay #28 buzzing

by Dave J
(Denver)

Boat is generally in good shape, but after de-winterizing, the (new) starter makes a loud clicking sound while it turns the engine over.
When ignition is switched on, the fuel pump reads 12V, but does not pump. Relay #28 makes high-pitched buzzing sound unless the pump is unplugged. The pump tests good out of circuit. Engine starts when gas is squirted into carb-throat, and runs a couple seconds. Kill-switch and ignition switch seem to be working well, as does all other equipment...

-All suggestions and humor is appreciated.

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Jul 20, 2021
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starstarstarstarstar 		Penta 432A relay buzzing SOLVED
by: Anonymous

Tried relay-swap, then traced out all related wiring. The PU16 circuit (run-relay pick) FUSE-8, at the helm instrument panel, was not passing 12V from ignition key. The fuse had developed a bad connection over the winter.
The relay was getting picked intermittently (buzzing) via the D+ on the alternator, as the starter turned the engine over!! I reseated the fuse and all was good. :-]

-Thanks for your additional insight, John.
Jul 13, 2021
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by: John

Good idea, while the relay may test okay out of the circuit, depending on circuit arrangement a set of relay contact also used to hold in the relay and if that auxiliary contact is not making good contact then the relay doesnt hold in or partially energizes
Jul 13, 2021
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starstarstarstarstar 		Much Obliged, John
by: Anonymous

Since it tested out of circuit (no load), I ignored the relay itself. I'll give that a try.
Jul 13, 2021
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by: John

Possible that the relay is faulty, the relay powering the fuel pump might not be closing and therefore pump doesnt work, buzzing often associated with relay coil being on the way out. So first step is change the relay.

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