• 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.



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.
See more
See less

Problems with 2005 Mercury 200 OptiMax

  • Filter
  • Time
  • Show
Clear All
new posts

  • Problems with 2005 Mercury 200 OptiMax

    HELP! I have a OptiMax 200 that has 33 hours. Here's the situation: No issues starting the engine when first putting in at the ramp, and no issues when first running down the lake. I run short distance due to the water I'm fishing. I'll then troll around for 2 to 3 hours fishing and then try and fire up the motor. Turns over and tries to fire, but just doesn't "catch". I've been stuck 3x now and had to troll back to the ramp. I've had it in for service after each time and the engine is checking in with no problems. The time before last, they said my ignition switch was bad and replaced. After the new switch, I was out this past weekend and you guessed it, ran fine when I first put in, then after a few hours of no use, I could not get it started again.

    I run a Lowrance 332c GPS / Fishfinder and really is the only thing I have powered up when fishing.

    Alternator was check and is good.

    I thought about the batteries. I had the cranking battery and trolling batts tested, they show as good batteries. Volts look fine when starting (~13V) and running (~14V).

    When they have it at the shop, they can't duplicate the problem.


  • #2
    Re: Problems with 2005 Mercury 200 OptiMax

    I would suggest first checking for adequate spark when the motor is cranking but does not fire. This will help you narrow down the problem.
    1996 Mercury 150HP V6 carbed outboard motor and Maxum 1900XR bowrider boat


    • #3
      Re: Problems with 2005 Mercury 200 OptiMax

      You might have a scotchlock splice in the kill circuit laying low in the bilge so it gets wet when yer under way. Gets wet and fails, then dries out before the mech looks at it. Is dry when you launch, but 3 hours later.......

      By the way, I don't think there is any place for idc, or even crimp splices anywhere in a boat on on a trailer.

      hope it helps


      • #4
        Re: Problems with 2005 Mercury 200 OptiMax

        Thank you both for your input. I've been waiting to respond to you with hopes that someone else may offer their thoughts.

        My update - I've discussed both your thoughts with the Service center. I've purchased a new starter battery (1000 MCA). The last one was also 1000 MCA, however it was two years old and I'm attempting to figure this out.

        I was out yesterday. Everything ran fine. Started, no issues. Traveled down the lake for about 5 minutes, fished with trolling motor for 90 mintues. Then moving to a new location on the lake, I started the engine, started to idle a bit before getting to speed and the engine died. Restarted and died again. Third time, I was able to get it started - fired right up like there wasn't an issue. Ran fine all the way back to the dock.

        Again - Thanks for your help. My plan is to head out again this Saturday and try and duplicate the issue. If successful, I'll get it on the trailor and head back to the Service Center.


        • #5
          Re: Problems with 2005 Mercury 200 OptiMax

          I'm still betting on scotchlocks in bilge water, or maybe a spider's nest across the ignition switch or kill switch in the shifter.

          Test would be to disconnect the kill wires from the switchboxes when thetrouble is occurring (at the boat ramp, right after recovery) and using a good vom, measure the resistance to ground on either wire with the ignition switch on. It should be infinity. If there's leakage, you'd have flakey ignition.
          Then you dog it till you find the bad part.

          If it's good, you've eliminated that theory and advanced the mystery.

          hope it helps


          • #6
            Sign up today
            Re: Problems with 2005 Mercury 200 OptiMax

            I don't see where you say that you have already confirmed that the spark has failed when the motor dies or does not start. While this may be the case, until you confirm this you may be focused on ignition when you acually have a fuel related problem. Just my thoughts...
            1996 Mercury 150HP V6 carbed outboard motor and Maxum 1900XR bowrider boat