Reply
 
Thread Tools Search this Thread
 
Old 27 April 2011, 14:39   #1
Member
 
andreworiordan's Avatar
 
Country: Ireland
Boat name: Ocean Escapes
Make: Excalibur
Length: 9m +
Engine: 150Yamaha&300Verado
Join Date: Jan 2007
Posts: 223
I'm gonna blow a Fuse!!!

Hi all, I have a 90hp 4 stroke Mercury engine, the year is 2004. over the last two weeks It has been blowing the 20amp fuse in my engine, I would be driving away and and it will blow, I have checked the cables in the engine looking for a short circuit but cant find anything obvious, it sometimes blows when i'm tilting the engine and today I noticed that it just blew, didn't even touch the tilt which makes me think its not a problem with the tilt switch, it goes at random time, She might run all day then blow when i'm tilting the engine up, then the next day it might blow 3 fuses and then be fine, any ideas?

When it does blow I loose my trim, my Rev gauge freezes and if i try start the engine it obviously has no power so it does nothing

Any help would be great, I was hoping to be up and running doing tours this weekend but this is making me very nervous bringing paying passengers out on my boat.

Thanks Guys
__________________

__________________
Andrew O'Riordan
andreworiordan is offline   Reply With Quote
Old 27 April 2011, 14:45   #2
Member
 
andreworiordan's Avatar
 
Country: Ireland
Boat name: Ocean Escapes
Make: Excalibur
Length: 9m +
Engine: 150Yamaha&300Verado
Join Date: Jan 2007
Posts: 223
The Engine in Question
Attached Thumbnails
Click image for larger version

Name:	SG1L0117.jpg
Views:	159
Size:	51.2 KB
ID:	58803  
__________________

__________________
Andrew O'Riordan
andreworiordan is offline   Reply With Quote
Old 27 April 2011, 15:03   #3
Member
 
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: 859
Worth checking the wiring from the throttle box up into the handle - often chafe around the pivot
__________________
Jeff is offline   Reply With Quote
Old 27 April 2011, 15:11   #4
Member
 
Country: UK - England
Town: Gloucestershire
Boat name: Osprey
Make: Osprey Vipermax
Length: 5m +
Engine: E-tec 300 G2
MMSI: TBC
Join Date: Dec 2006
Posts: 4,013
its going to be chafed wires somewhere, water in something start at the control box and work you way back.

you can disconnect things and run it for a while to see it the problem stops. e.g. the trim. Try disconnecting at the control box and run without it for a while. Then try disconecting at the engine harness.
__________________
---------------------------------------------------
Chris Stevens

Born fiddler
Chris is offline   Reply With Quote
Old 27 April 2011, 15:12   #5
Member
 
andreworiordan's Avatar
 
Country: Ireland
Boat name: Ocean Escapes
Make: Excalibur
Length: 9m +
Engine: 150Yamaha&300Verado
Join Date: Jan 2007
Posts: 223
will have a look at that tomorrow, whats strange is how random it blows, i'm gonna make a full list of what might be causing a short circuit and go through everything i can, i was thinking of disconnecting the wiring loom and tilt up/down and see if it blows, if it does i can rule out the controls, next maybe disconnect the tilt switch on the engine, I was talking to a few people and they mentioned maybe a damaged magneto?
__________________
Andrew O'Riordan
andreworiordan is offline   Reply With Quote
Old 27 April 2011, 15:20   #6
Member
 
Country: UK - England
Town: Plymouth
Length: 6m +
Join Date: Mar 2011
Posts: 2,693
Quote:
Originally Posted by andreworiordan
will have a look at that tomorrow, whats strange is how random it blows, i'm gonna make a full list of what might be causing a short circuit and go through everything i can, i was thinking of disconnecting the wiring loom and tilt up/down and see if it blows, if it does i can rule out the controls, next maybe disconnect the tilt switch on the engine, I was talking to a few people and they mentioned maybe a damaged magneto?
They wernt engineers by any chance.....pardon my scepticism

Start with the wiring, it's got to be something silly to be so random

Peter ~ askboatsandoutboards4sale@sky.com ~ 07930 421007
__________________
Boats&Outboards is offline   Reply With Quote
Old 27 April 2011, 15:47   #7
Member
 
andreworiordan's Avatar
 
Country: Ireland
Boat name: Ocean Escapes
Make: Excalibur
Length: 9m +
Engine: 150Yamaha&300Verado
Join Date: Jan 2007
Posts: 223
is it happens I was talking to a marine engineer, he is a pure legend of a man!

So i guess its a case of looking at every bit of wiring on the engine, could it be anything to do with the motor in the tilt unit itself, There is a bit of rust on the motor case itself and makes a louder noise when tilting the engine down.

also will need to have a look at switches to see if there is any water getting in there
__________________
Andrew O'Riordan
andreworiordan is offline   Reply With Quote
Old 27 April 2011, 16:18   #8
Member
 
Justribing's Avatar
 
Country: UK - England
Town: Devon
Boat name: Sweet Chariot
Make: Ribcraft 5.85m
Length: 5m +
Engine: Suzuki DF140
MMSI: 235065385
Join Date: Jun 2008
Posts: 45
It may be worth getting someone to megger the motor for you if it has water in or a short it could cause this.

Is there anything thats tight, in other words is something drawing to much current or is something maybe shorting. Same result blown fuse different causes.
__________________
Justribing is offline   Reply With Quote
Old 28 April 2011, 03:52   #9
Member
 
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: 1,357
RIBase
Quote:
Originally Posted by Jeff View Post
Worth checking the wiring from the throttle box up into the handle - often chafe around the pivot
As others have said, could be lots of places, but I have had this when we had a dodgy ignition barrel......intermittent problems Good luck tracking it down.....
__________________
Dan Worth
www.razorbillribs.co.uk

Follow us on Facebook http://www.facebook.com/#!/group.php...17306504953480
Razorbill RIBs is offline   Reply With Quote
Old 28 April 2011, 03:58   #10
Member
 
biffer's Avatar
 
Country: UK - England
Town: swanwick/hamble
Boat name: stormchaser
Make: custom rib
Length: 8m +
Engine: inboard/diesel
Join Date: Aug 2007
Posts: 3,848
start it up and wiggle as many wires as you can lay your hands on, might throw up a fault
__________________

__________________
biffer is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 00:01.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.