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Old 13 June 2014, 14:25   #1
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Fuse analysis for Mercury 4 Stroke?

Hi all, I'm having trouble with my Mercury 60 blowing fuse 3 intermittently it's the 15a fuse.

Does anyone know where I can find a wiring diagram? Need to get to the bottom of this rather quickly as when it goes I loose everything including trim. Click image for larger version

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It's a 15a fuse which blew about a month ago and I replaced it with the spare 20a that was in the holder. I forgot all about it until last week where I replaced it with the correct 15a fuse and now it's blown again within a day. I thought I'd established an electrical fault after the first time it blew where I had forgot the ground connection to all the gauges but sadly that's obviously not the fault.


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Old 13 June 2014, 14:57   #2
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Old 13 June 2014, 15:09   #3
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Great thanks I'll have a look.


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Old 13 June 2014, 17:26   #4
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Guys I'm in dire need of some assistance here! I've looked on the boat info website but my serial number doesnt seem to corrospond to anything on there.

My serial number starts with OP563747 - 60PT4S
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Old 13 June 2014, 18:27   #5
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Hi Happy Shopper, before you go too far....have you checked the actual fuse holder itself? Looks the same as the one on the Opti.... We once had a problem with a fuse popping intermittently (drove us round bend) after lots if messing about it turned out to be a dodge connection in the holder itself, where the blade was ever so slightly loose (had checked, but wasn't obvious) not saying it is that, but worth eliminating.... Good luck
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Old 13 June 2014, 18:33   #6
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Thanks mate I'll have a look at that. I'm wondering if it's something in the controls like a wire for the trim shorting to ground intermitantly or something.
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Old 14 June 2014, 15:24   #7
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I've managed to narrow it down a little further, after it popped again today I started looking at the possibility that it was something in the remote throttle control. I'm very confident that it's the wiring for the trim switch on the throttle.

Once I got the boat back to the mooring I gave it death on the throttle forward and reverse (with the engine off) I must have gone through the gears six times hard until suddenly the trim stopped working and I lost everything again. Fuse blown. I'll try and get a berth in the marina in the week and see if I can strip it down and find the issue.


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Old 14 June 2014, 17:18   #8
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I've got exactly the same problem on one of my Mariners.

It blows when I set the engine trim after launching, once replaced it won't blow for the rest of the day.

It's doing my nut in.
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Old 14 June 2014, 17:34   #9
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I'll report back with my findings! May help you mate!


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Old 16 June 2014, 12:54   #10
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Feeling confident!

I have to add that this fault has probably come about due to me mis routing the wiring in the control after I stripped it down to re grease it all.

Lives and learns....but I'm confident I've nailed it. If it ain't broke and all that....

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Don't suppose anyone has a photo of one of these as I can't quite see how this is avoidable!


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