Welcome Guest - Sign Up today
Welcome Guest - Sign Up today


No announcement yet.

pontoon won't start

  • Filter
  • Time
  • Show
Clear All
new posts

  • pontoon won't start

    So my mother and step-father have a pontoon they bought last year. They have been having trouble a few times this year with a dead battery. I knew they had 2 batteries but did not know they had a Perko switch installed. I thought he just had the 2nd battery and manually switched it. Anyway, we were going to go out on their boat today and it was dead. I went down to look and found that they had a local marina install the Perko switch He had a charger hooked up to what he thought was #1 battery (the newer battery) so I asked him if he tried starting it on #2. We tried it and it fired right up but stalled after about 15-20 seconds. After that nothing. No click, no power trim. But the depth finder and horn worked. We checked the emergency cutoff switch and it was in the Run position. We removed the older of the 2 batteries and put the charger on it and it read 1% charged. The other battery was still in the boat and connected and read about 98% charged but still could not get any click or anything no matter what battery position the switch was on. I'm thinking the old battery is bad but confused as to it not starting after we disconnected the old battery. Checked for breakers and couldn't see anything. It has a Merc on it if that matters. Even tried wiggling the throttle around to see if it might be the safety switch. Told him to take both batteries and get them tested but pretty sure the original one id bad. It came with the boat when they bought it so no idea how old it is. The other one was bought new last year.


  • #2
    I'm thinking this is an outboard (Merc) and if so should be in the Merc outboard section. You have an electrical issue, but the issue is the motor will not start, so its a motor problem. You'll get more folks looking this way.

    If you agree, PM or put a mad in your comment so they will see and move the thread

    If one bat is dead (or close to it) and is connected to a good bat in parallel, the bad one can damage the good one. Have the good bat off the charger for an hour, then load test it
    94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
    95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
    07 Seadoo GTX
    Merc Adults Only VP Adults Only
    G-Dad always said "First Liar doesn't stand a chance"


    • #3
      Yeah. thats what i was thinking. I didn't put it in the Merc section cause its an electrical issue? I told him to get both batteries tested then go from there. It did this a few weeks ago then he charged them and it ran fine last weekend. Now today its dead again. I was thinking the bad one would be pulling down the new one
      Last edited by boatman37; August 11th, 2019, 05:13 PM.


      • #4
        When you removed BAT #1 you likely eliminated the ground connection to the engine from battery #2. Only guessing at that because I don't know how the grounds were connected. Just because there is a cable on bat #2 NEG doesn't mean it is connected at the engine block.


        • #5
          Sign up today
          Shouldn't have. The one I disconnected had the ground jumpered to the other battery so the remaining battery had the main ground connection. He was supposed to take both batteries to get tested today but haven't heard from him yet.