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Old 04 May 2016, 15:45   #1
Country: UK - England
Town: portsmouth
Boat name: patch
Make: avon sr5.4/4m
Length: 5m +
Engine: mercury 90/honda 30
Join Date: Oct 2008
Posts: 260
Optimax 200hp not charging !!

Just wondered if anyone has had this she starts perfect and runs lovely but after about 45mins she cuts out then realised that she's drained the battery so I've checked it running and she's not charging !! Is there a fuse or diode I can check !!

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Old 04 May 2016, 16:10   #2
neil.mccrirrick's Avatar
Country: UK - England
Town: Oldham
Boat name: Miss Isle
Make: Solent 6.9
Length: 6m +
Engine: 225 optimax
Join Date: Jan 2008
Posts: 884
I've a 225 opti. There are 4 20 amp fuses all together on the right hand side opposite the oil tank next to the relays.

If you take the cover off the flywheel you will find the alternator and the belt that drives it. I'd check that as well.

If you don't like my opinion, I have others.
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Old 05 May 2016, 11:00   #3
Country: UK - England
Town: Chesterfield
Boat name: Sea Quell
Make: Picton Cobra
Length: 5m +
Engine: Mercury 150 4 Stroke
MMSI: 235038298
Join Date: Sep 2003
Posts: 911
Directly from a USA forum:

Alternator Lead: You have something else going on here. The LARGE RED output lead is a FUSIBLE LINK LEAD (with a 100amp fusible link protector IN that lead). It is designed to protect the sensitive electronics on your engine from an overcurrent condition (most commonly from reverse-polarity battery connection).

I would be very wary of making "repairs" to this fusible link lead circuit. If it was damaged in any way- REPLACE the fusible link. It is a separate replacement part.
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Old 06 May 2016, 08:16   #4
Razorbill RIBs's Avatar
Country: UK - Wales
Town: N. Pembrokeshire
Boat name: Various
Make: RIBs & Hovercraft
Length: 9m +
Engine: Outboards
MMSI: Various
Join Date: May 2009
Posts: 1,358
As Jeff says, remove and check your fusable 100mp link from the alternator for continuity.

Its not always an electrical failure either, had one fail when the cable came free of its cable tied position and caught on the wrong side of the throttle linkage which stretched it to breaking as the throttle was opened. Looked visibly okay!

If it is failed I recall the cost of a genuine replacement being a silly price. We ended up making up replacements (keep spare onboard also) using quality soldered spades, copper rivets, 100amp megablade type fuse and a couple of layers of a good, thick adhesive lined heat shrink....
Dan Worth

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Old 07 May 2016, 03:18   #5
RIK's Avatar
Country: UK - England
Town: Hertfordshire
Boat name: Five-o
Make: Tornado 645
Length: 6m +
Engine: mercury Optimax 150
Join Date: Jun 2007
Posts: 92
Have you checked the small earth wire from the alternater to engine block I had a problem of not charging

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