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Under dash alarm?

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jfhj2 View Drop Down
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    Posted: 06/20/2012 at 7:56pm
Hello all. It's been a while since I've been on here. Just life I guess. The wife and I liked boating so much on our pontoon that we both sold our places, got married and bought a place on the lake. Not waterfront, but a right of way to the water with rights to dock a boat and swim. We have 5 acres of fields overlooking the lake. Couldn't ask for much more. Well maybe could ask for the boat not to act up now that we can use it most days.
 
Today was our first ride other than last week when we put in and tied to the dock. After about 10-15 minutes into our ride to the Landing for supper, we started hearing an alarm from under the dash. I am still unable to determine the cause and was hoping someone might point me in the right direction. The alarm itself is a small black piece that says sp-509 ( or close to that) and 5-15 vdc. I will also say that the puppy was under the console shortly before this but didn't notice anything going on with her. This alarm has 2 wires into it, a solid purple and a tan with blue stripe. The purple goes back to the ignition switch. The tan/blue runs through a wiring harness sort of thing then is just hanging there with a bullet type connector on it. There is also a black wire that seems to have the other half of a bullet connector on it in the area and they do go together but makes no change in the alarm. Only way to kill the noise is to shut the key off and the alarm comes back on as soon as key os put back into run position.
 
Any chance anyone out there knows what may have triggered this your help would be appreciated. Not sure it's connected, but the battery charging meter doesn't seem to be moving as much as it used to. Not sure if this is related to the alarm or just because I put in a new deep cycle battery before I put it in the water for the season. It probably says on my page but we are talking about an 18' Playbouy Eagle with a 60 HP Bigfoot. Thanks
 
 
2012 Harris FloteBote Sunliner 200 w/ 75HP Merc FI 4 stroke China, Maine
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 06/20/2012 at 8:18pm
That would be the overheat alarm. Is it possible you may have picked up some trash on the lower unit water intakes? Does the alarm sound even after the engine is cold (Not used for an hour or so)?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jfhj2 Quote  Post ReplyReply Direct Link To This Post Posted: 06/20/2012 at 8:57pm
I have yet to try again. I will let cool overnight and try tomorrow. Thanks. There was planty of water coming out the side as if the water pump is working good. I did shut down and we swam for 1/2 hour and then I tried crawling under to try and figure it out. It was off for about an hour total and would sound just turning the key on while trying to figure it out without the motor running if that helps. I will go down in the morning and see if it sounds just turning the key on or if it needs to run a bit.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jfhj2 Quote  Post ReplyReply Direct Link To This Post Posted: 06/20/2012 at 9:01pm
I should also mention that there was also another alarm looking thing under there but somewhat bigger that wasn't going off. Hopefully that was the overheat oneWink
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 06/20/2012 at 9:23pm
The main thing that says it is the overheat alarm, is where you noted that there is "a solid purple and a tan with blue stripe" wire going to that alarm. That wiring combination is used from the engine temperature switch (On the motor) to the warning horn (Specifically the tan W/Blue stripe comes from the temperature switch). The purple is just 12 volts when the ignition switch is turned on. So it could be one of a few things. Since it appears that the alarm continues to sound, even though the engine has been off for some time (1/2 hr or so), tells me that either the temperature switch is bad, the warning horn is bad or there's a wiring problem (with the Tan W/Blue Stripe wire). It is not uncommon for the warning horn to go bad. One test would be to take the engine cover off and locate the Tan wire with the Blue stripe and disconnect it from the temperature switch. Then turn the key on and see if the horns still sounds. If it does, then it's not the temperature switch. More likely it's the horn. All this assumes the horn will not shut off at all whenever the key is turned.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 06/20/2012 at 9:44pm
Didn't think about that in my reply, but after looking at the other post, it could also be the oil sensor in the oil tank. Try unplugging it and see if it stops. If so, bad sensor..
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 06/20/2012 at 9:47pm
Put the year of your bigfoot in your signature line, thats when having that info tells us what your motor is equipped to do as we can't guess at it. Wink
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jfhj2 Quote  Post ReplyReply Direct Link To This Post Posted: 06/20/2012 at 9:54pm
Thanks all. I have plans to check it out in the morning. The motor is a 98 as well and will try to remember how to add that to my line. Hoping just a sensor but not worth the risk. I was just talking to the wife last week about how much more economical my friends boats are to run with the new four strokes. They seem to run forever on little gas. She thought my idea to upgrade was more comical than economical.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jfhj2 Quote  Post ReplyReply Direct Link To This Post Posted: 06/20/2012 at 10:09pm
If I understand right, turn the key on and if it sounds after sitting all night it is prob not overheating. Unhook the temp sensor wire and see if it still sounds. If it does, try changing the alarm itself. If disconnecting the wire does stop the noise, try finding a sending unit? Worse case, if all is quiet when I turn the key on in the morning but starts to sound after a short ride, head for the boat landing to put on the trailer? Someday I hope to remember all this to help someone in need. Thank you.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 06/20/2012 at 10:31pm
Also like was mentioned above, disconnect the wire(s) at the oil tank reservoir too and see if the warning horn stops.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jfhj2 Quote  Post ReplyReply Direct Link To This Post Posted: 06/21/2012 at 11:35am
So that wasn't too bad other than trying to balance as the boat was in the water. No change in the alarm when unhooking the tan/blue wire but it does stop when unhooking the blue wire to the oil tank so guessing it is prob the oil level sender that has gone bad. The local Merc dealer is booked up past the 4th of July. Is it ok to unhook this wire and still run the boat. I understand it will not let me know if I let the injection oil get too low. I just didn't want to not have the oil being injected and ruin the motor. I am capable of keeping the oil tank topped off. Thanks again. Now to look into getting the part and how big a job.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 06/21/2012 at 1:00pm
Can't say that I would recommend it, but as long as you keep a close eye one the oil level, you'd probably be ok. The thing is, I wonder if the warning wiring is in series with other warning sensors and by disconnecting the oil sensor wires you are bypassing other important alarms. One test I would make before heading out is to again, remove the engine cover and disconnect that Tan wire from the temperature switch. With the key in the ON position, ground the tan wire (The one coming from the engine harness, not from the switch) to the engine block and see if the alarm sounds. If so, you at least know that the overheat alarm will trigger. If not, then there could be other problems that disconnecting the wiring at the oil resevoir are only masking..
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jfhj2 Quote  Post ReplyReply Direct Link To This Post Posted: 06/21/2012 at 1:52pm
Where I have already pulled the boat from the water and it was still in the driveway, after your last post I went back out and tested to see what protections I have left. The alarm still works when grounding out the wire going to the temp sensor so that is a plus. I have also already ordered the new switch for the oil tank as i'm sure it would be nice to have. Thanks again for all your help, It's in the low 90's here today and getting ready to go back out.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CajunDiver Quote  Post ReplyReply Direct Link To This Post Posted: 06/21/2012 at 3:06pm
You could put some oil in the gas as a precaution but then you may wind up double oiling. Not sure what effects would be on your motor so you would want to ask a mechanic but I have run a heavy oil mixture before on some engines short term without an issue. I wouldn't make this a permanent solution unless you disconnected the oil pump all together.
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