Engine Fuse / 20 A blowing

[Kanadakid]

Gents,<br /><br />I'm trying to determine what wires could be shorting and blowing the 20 A fuse in my 2003 F90.<br /><br />When it blows, the engine won't do anything. Turn over, click, nothing. The trim /tilt won't go one either.<br /><br />It is the weekend and wanted to try and determine what wires I should re-run or look for a short in.<br /><br /><br />Thanks for the help,<br /><br /><br />Kid

 

[Kanadakid]

Re: Engine Fuse / 20 A blowing

no ?

 

[bigbrownbuku]

Re: Engine Fuse / 20 A blowing

disconnect the main plug and jump the starter solenoid brown wire to power to start the engine. this will narrow it down to motor or boat.

 

[rodbolt]

Re: Engine Fuse / 20 A blowing

ok<br /> I looked a bit at that today.<br /> the 20 amp fuse supplies the main relay. the key on yellow activates the relay and the ECU controls deactivation at shutdown.<br /> almost any red/y wire that is chafed under the hood can do it.<br />can ya redescribe the problem and tell me the exact location of the fuse again ?

 

[Kanadakid]

Re: Engine Fuse / 20 A blowing

Thanks for looking this up as knowing what wires might be the culprit may be my only chance at a fix. 70 % of the wires are inaccessible because they are under the back deck.<br /><br />The engine will run for a while and then sometimes after shut down it won't turn back on and the tilt trim motor won't work.<br /><br />I did disconnect all the accessories from the battery and it still blew a fuse so that (I think tells me that it eliminates some of those wires that are shorting.<br /><br />Sometime the engine will start running rough and them when I shut down it won't turn over again unless I replace the fuse.<br /><br />On a couple of occasions the 20 A fuse blew as soon as I put it in.<br /><br />On the upper side of the engine the is a black plastic clip in the clip is a fuse holder. If you remove the fuse-holder cap the is 2 fuses in the - top is a 20 A mini fuse and the bottom is a 30 a mini fuse. <br /><br />The 30 has never blown.<br /><br />2003 F 90

 

[rodbolt]

Re: Engine Fuse / 20 A blowing

your motor is carbed so it should not have a main relay. the 30 amp is for the start circuit I believe.<br /> if the fues blew when you installed it then we need to look at circuits downstream of the fuse that have 12V when the key is off.<br /> any red wire will have 12V with the key off, this includes the red wire to the key switch, the yellow wire or any red/y wires will only have 12V when the key is on.<br /> power for the trim switch comes from the fuse to the key switch then to the trim switch, look carefully for any chafed red wires if it will blow a fuse with the key off.<br /> its also possible the keyswitch is shorting to the black wire internally. the guages are supposed to be fuse seperatly but as I did not rig it I dont know.<br />nothing attached to the battery should affect that fuse unless an engine red or yellow wire was connected through an instrument wire to the negative battery terminal.<br /> remember electricity acts just like water in a pipe. if you spring a leak it flows to much and a fuse blows.<br /> but ill work a bit harder to find an 03 diagram.

 

[Kanadakid]

Re: Engine Fuse / 20 A blowing

Rod,<br /><br />Thank you very much. That gives me a realistics place to start looking. <br /><br />It is great having you on this board. <br /><br />Kid

 

[rodbolt]

Re: Engine Fuse / 20 A blowing

do you have a service manual on that motor ?

 

[Kanadakid]

Re: Engine Fuse / 20 A blowing

Yes ,but its terrible as it is an aftermarket manual (clymers) and don't reccomend. They don't even show where the fuses are.<br /><br />I found the short. It seems on the bottom of the throttle control are some wires that run up to the trim button.<br /><br />Either the manufacturer (Triton) or my Dealer (Halls marine) cut the whole in the aluminum and<br />did a rough cut for the wires. They left it very sharp and exposed aluminum which after a couple years wore away the outer sheathing. <br /><br />Thus the short.<br /><br />I have taped the wires, put a protective grommet<br />around the hole......which fixed and should prevent from happening again.<br /><br />Upon seeing how this was rigged, was very dissaponting. Zero quality or care was taken. Wonder what else I'll have to deal with down the road ?<br /><br />Thank you for the help.

 

[rodbolt]

Re: Engine Fuse / 20 A blowing

wish i could say yours was an isolated incident,at least 80% of the claims i do involve poor/shoddy rigging.<br /> glad ya found it, the aid was when it blew with the key off, limits the 12v circuits