Mercruiser 3.0 blowing ignition fuse??

Joined
Aug 25, 2022
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Hi guys.
I'm having trouble with my 2001 Bayliner 175 capri mercury mercruiser 3.0 engine.

The boat cut out while driving and blew the fuse for the ignition circuit. I replaced the fuse and it blew it again, a mechanic checked all engine components and gave them the clear and said it is a wiring loom issue.
I then found a melted wire (which wasn't original) which connects to RUN/OFF switch below throttle, so I took it out and repaired wires surrounding and left out the switch and connected the two wires directly to each other to bypass switch.
When I changed fuse again the boat started and worked for about 30 minutes and cut out again, this time the fuse blew but the TILT/TRIM switch no longer worked, something that did previously with fuse blown.
This time when I change the fuse it blows it straight away and I can't find anymore wiring faults.

Anyone have any ideas to what could be causing these electrical shorts?

Note, the TILT/TRIM switch (Black switch in photo) was replaced by previous owner and worked when fuse first was blowing and wire replaced and now won't work when fuse is blowing.
 

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alldodge

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There are a lot of 3.0L, what is your serial number?
What wire did you remove?
 

Bondo

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Hi guys.

Anyone have any ideas to what could be causing these electrical shorts?

Note, the TILT/TRIM switch (Black switch in photo) was replaced by previous owner and worked when fuse first was blowing and wire replaced and now won't work when fuse is blowing.
Ayuh,..... Welcome Aboard,..... I'm guessin' the underlined might be the cause of the problems,.....

The trim pump has a fuse in a holder on it, so look there,.....
It might also have the big plastic fuse in it's battery feed,....

Otherwise, there's gotta be something else, that's shorted, in the ignition circuit, so anything "key" powered,....
 
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