• 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

Hooked up battery backwards, F115, F9.9

  • Filter
  • Time
  • Show
Clear All
new posts

  • Hooked up battery backwards, F115, F9.9

    Hey guys, I just did a stupid thing. While getting my boat ready I took off the cranking battery, charged it, cleaned all the terminals and when I re-connected everything I hooked it up backwards. Nothing was turned on at the time but I noticed a funny smell now nothing works, motors won't turn over and no power trim/tilt. Any ideas what happened? Is there a fuse somewhere I should be looking for?


  • #2
    Re: Hooked up battery backwards, F115, F9.9

    Here is a picture. No. 33 and 34 are fuses.
    Attached Files


    • #3
      Re: Hooked up battery backwards, F115, F9.9

      Thanks fin, the fuse was it on both motors. Found them right before I saw your reply, lol. Anything else I need to check such as the charging system? I haven't started either motor yet but have power back to both.

      Thanks again.


      • #4
        Re: Hooked up battery backwards, F115, F9.9

        only thing to check no is rectifier output, simply check the battery voltage, then start the engines, run about 2000 RPM, voltage should increase by about 1 volt over non running battery voltage.
        if its ok, ya got lucky, if not open the ole wallet
        no tech questions by PM, they wont get answered.
        you have to be trusted by the people that you lie to .


        • #5
          Re: Hooked up battery backwards, F115, F9.9

          Thanks Rodbolt, I was hoping you would reply and tell me how to check them I didn't have time this evening to get them running but have everything ready to go for tomorrow. I will check it first thing. Sure hope I got lucky, no idea what a new rectifier costs but I'm sure it's not cheap.

          I feel like an idiot, I know better. I got in a hurry because my kid was sleeping in the house and I just ran out to switch batteries on the charger but thought "I'll just throw this one back in real quick to make some room on the bench" Oh well, I'm sure it won't be my last brain fart. Thanks again guys, I'll post up after I get them running and let you know what happened.

          EDIT: just checked the price of the rectifier/regulator assembly, $62 for the 9.9 and $110 for the 115, ouch.


          • #6
            Re: Hooked up battery backwards, F115, F9.9

            Well call me Lucky, I couldn't sleep last night so I got up early and fired up both motors before work. Battery voltage was 12.7 volts. At around 1000rpms the F115 was showing 14.7 volts and the F9.9 suprised me a little with a reading of 15.1 volts at maybe 2000 rpms (no tach on that one). I am assuming that the little higher voltage than Rodbolt stated won't hurt anything but someone please correct me if I'm wrong.

            Thanks again for the help gentlemen. The time you take to answer posts on this board is greatly appreciated. If anyone wants old Lucky here to rub their lottery ticket just send it over, no charge


            • #7
              Sign up today
              Re: Hooked up battery backwards, F115, F9.9

              your GTG