• If this is your first visit to the iboats.com Boating Forums, be sure to check out the FAQ. To post a question or comment, begin by signing up. To start viewing messages, select the forum that you want to visit from the selection below.


Announcement

Announcement Module
Collapse

Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Below are some additional forum policies in hopes of all iboats members will follow, Thank you.

1. Please do not reply to old topics or hijack existing topics. Old topics of a technical nature are like a library book, Please do not write in them.

2. Old topics should be considered archives and used for reference only. Please do not reply to them.

3. Do not take over someone elseís topic (aka hijack) with your own question, even if it is similar. If you have a question that has not been covered to your satisfaction in the archives, it is always best to start a new topic of your own.

4. If you have a question for the original poster (OP) and the topic is over 30 days old, send the OP a PM, he may not even visit the forums any longer, or may not notice your question in the old topic.

5. By starting your own topic, you will receive the maximum number of views by forum helpers that may not even notice your question when itís posted at the end of someone elseís topic. And those answers will be specific to your particular issue.

6. Please do not post to topics that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any topic that remains inactive for that long should be considered "dead". It is especially confusing when there is an entirely new question posted to an old topic.

7. Posting at the end of any topic is considered to be hijacking the original posters topic which in turn subjects the topic to be closed if it continues to happen thus not making it fair to the original poster in the future had for some reason he/she needed to return for additional information or provide an update of the problem solved which is always welcomed within a reasonable amount of time frame.

8. Please note that you should see a red banner pop up near the bottom of each inactive topic asking you not to reply to old topics. The Red banner will read: Please note this topic has been inactive for 90 days. For the best results, please start a new topic.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
http://forums.iboats.com/forum-rules-guidelines-405/
See more
See less

Risk of not using a 90 amp starter solanoid fuse

Page Title Module
Move Remove Collapse
X
Conversation Detail Module
Collapse
  • Filter
  • Time
  • Show
Clear All
new posts


  • Risk of not using a 90 amp starter solanoid fuse

    Hi all.

    motor is a 2003 mercruiser 350 mag mpi.

    My 90 amp starter solanoid fuse has gone and i was looking at an official replacement part and the cost is around $70-90 in australia for the official fuse which is hefty price tag for a fuse. I was wondering what risk i might be taking if i do not run the boat with this fuse ?

    There is a circuit breaker in the ignition line so was thinking it may not cause too much of an issue if i dont replace the fuse. Plenty of motors do not have this fuse. Otherwise might make up a non official 90amp fuse cause it will only cost about $10

    Thanks


  • #2
    Re: Risk of not using a 90 amp starter solanoid fuse

    it`s nothing special, was being called a "lawer fuse" but most older boats never had one.Plus you already have a 50A CB in that line.
    NO PERSONAL QUESTIONS, THIS IS WHAT THE FORUM IS FOR.

    Comment



    • #3
      Re: Risk of not using a 90 amp starter solanoid fuse

      Ok. I think i will just not bother replacing it. The cost is too expensive for the genuine part.

      Comment



      • #4
        Re: Risk of not using a 90 amp starter solanoid fuse

        Originally posted by Bt Doctur View Post
        it`s nothing special, was being called a "lawer fuse" .
        That's Bond-o's term for it.

        Just remember to disconnect the battery before you work around the starter. No doubt you shorted it out with a wrench when working on the engine, just imagine what would have happened if it wasn't there. That 50A breaker wouldn't have protected anything.
        Don S.

        sigpic

        Please, no PM's (Private Messages) regarding boat/engine problems.
        That is what the forums are for.
        Only forum/moderator issues will be answered in PM's.

        Comment



        • #5
          Re: Risk of not using a 90 amp starter solanoid fuse

          Originally posted by shankos View Post
          Ok. I think i will just not bother replacing it. The cost is too expensive for the genuine part.
          Ayuh,.... It seems that the Lawyer Fuse was added 'bout the time 'puters were added into the engine management systems....
          To All their motors, 'puter efi, or not..

          My motor ain't got a 'puter, 'n I didn't put in the Lawyer Fuse either...
          Any Grease is Better,..... Than No Grease at All.......

          Comment



          • #6
            Re: Risk of not using a 90 amp starter solanoid fuse

            Originally posted by Don S View Post
            No doubt you shorted it out with a wrench when working on the engine, just imagine what would have happened if it wasn't there. That 50A breaker wouldn't have protected anything.
            I was asking what risk i run without the lawyer fuse being in the circuit and a mistake happens ? What exaclty might i imagine could happen ? I had thought the circuit breaker would be sufficient.

            Comment



            • #7
              Re: Risk of not using a 90 amp starter solanoid fuse

              Without the "lawyer fuse" there is no protection for the main battery cable. If you short that out without disconnecting the battery first... sparks will fly and something will melt or burn. That's why you always want to disconnect the battery whenever working around the starter.

              Comment



              • #8
                Re: Risk of not using a 90 amp starter solanoid fuse

                Originally posted by Fishermark View Post
                .. That's why you always want to disconnect the battery whenever working around the starter.
                Nah, it's more fun 'live'....
                The world takes on a whole new perspective when viewed from 100' below...



                1972 Bertram 'Bahia Mar' 20
                2006 Mercruiser 4.3MPI (0W617679) w/Alpha 1 Gen II (0W829301)
                **
                Please don't send service questions in private messages. That's what the forum is for. Messages of thanks, always accepted.
                **
                Member of the month - April 2013. http://www.iboats.com/blog/achris-member-of-the-month/

                Comment



                • #9
                  Re: Risk of not using a 90 amp starter solanoid fuse

                  except it has nothinbg to do with a battery cable. thge 90A connection is what supplies power to the 50A breaker, then thru the harness to the dash.
                  NO PERSONAL QUESTIONS, THIS IS WHAT THE FORUM IS FOR.

                  Comment



                  • #10
                    Re: Risk of not using a 90 amp starter solanoid fuse

                    I actually learned that the hard way - working on my 56 Chevy years ago I was lazy and didn't want to disconnect the battery. I was using a box end wrench on the starter solenoid and touched the other end of the wrench to the metal brake line.... of course then ended up disconnecting the battery AND replacing the metal brake line. At least it wasn't the fuel line.

                    Comment



                    • #11
                      Re: Risk of not using a 90 amp starter solanoid fuse

                      Originally posted by Bt Doctur View Post
                      except it has nothinbg to do with a battery cable. thge 90A connection is what supplies power to the 50A breaker, then thru the harness to the dash.
                      Fair enough... that's true. I guess the point is to always disconnect the battery when working around the starter

                      Comment



                      • #12
                        Re: Risk of not using a 90 amp starter solanoid fuse

                        Originally posted by Fishermark View Post
                        Fair enough... that's true. I guess the point is to always disconnect the battery when working around the starter
                        Ayuh,... The Lawyers have done all they can to save the stupid, from themselves....
                        That's why step-ladders weigh Twice what they should, with All the safety stickers all over 'em....

                        Common Sense, still rules,... disconnect the battery....
                        Any Grease is Better,..... Than No Grease at All.......

                        Comment



                        • #13
                          Re: Risk of not using a 90 amp starter solanoid fuse

                          Originally posted by Bond-o View Post
                          Ayuh,... The Lawyers have done all they can to save the stupid, from themselves........
                          I say "let Darwin take control"...
                          The world takes on a whole new perspective when viewed from 100' below...



                          1972 Bertram 'Bahia Mar' 20
                          2006 Mercruiser 4.3MPI (0W617679) w/Alpha 1 Gen II (0W829301)
                          **
                          Please don't send service questions in private messages. That's what the forum is for. Messages of thanks, always accepted.
                          **
                          Member of the month - April 2013. http://www.iboats.com/blog/achris-member-of-the-month/

                          Comment



                          • #14
                            Re: Risk of not using a 90 amp starter solanoid fuse

                            Does a 90A fuse blow all by itself? No, Therefore, the fuse did it's job. Obviously, the battery was not disconnected and it prevented further damage.
                            Had it not been there, we might be reading a thread of the battery blowing up, or the battery terminals melting off, or whatever. Without that fuse, that wire would have been hooded to the starter directly, and very well could have melted the battery cable. Depending on where it was shorted.
                            That fuse is there for the un-trained backyard DIYer. Not the Mercruiser certified tech.
                            Don S.

                            sigpic

                            Please, no PM's (Private Messages) regarding boat/engine problems.
                            That is what the forums are for.
                            Only forum/moderator issues will be answered in PM's.

                            Comment



                            • #15
                              Re: Risk of not using a 90 amp starter solanoid fuse

                              Always disconnect the GROUND cable first!!!!! Or you'll be sorrrrry!!
                              Terry
                              87, 4WINNS H 190
                              470/Alpha I

                              Comment


                              Working...
                              X