1986 Johnson 150GT

[hopeless]

I have a random problem with my warning horn. It will sometimes go off as soon as I turn the key on (before engaging the starter) It will stay on anywhere from a few seconds to 5 or more minutes. Other times it will come on when running down the lake and do the same thing.SLOW does not engage as I can run as fast as I want to durning these times. Any suggestions???

 

[Will Bark]

Re: 1986 Johnson 150GT

Sounds like you have a tan wire that is grounding to the block somewhere probabley close to the sensors on the head,maybe. You do not have SLOW on a 1986 engine didn't start until 1989-90.

 

[j_k_bisson]

Re: 1986 Johnson 150GT

Well sorry to tell you, but that horn is not there to annoy you. It's ment to let you know that you have something wrong with your motor.

Also is you look in the factory operators manual, it states to shut down motor imediately when this starts going off. And then proceed to get it looked at by a qualified service tech. Or your self with a factory service manual. LOL

I would recommend you run the motor until you figure out what is going on with the horn.....

It could be, overheat condition, lack of fuel pressure, or a number of other things. You need to figure out what is going on with horn before running again, or it could possibly be not running for very much longer.

To figure out what is wrong, you will need the factory service manual (aka wiring diagram) and a test light. The system is prettry simple to test. It is basically a bunch of sensors that ground out if there is a problem. When it is going of, start disconnecting each sensor until the horn goes off. If it does not go off after all of them are disconnected, then you have a wire that is grounded out somewhere in the harness. If the horn stops when the sensors are being disconnected, then there is your problem. Pretty simple..... Check back in when you start getting into it. We'll help you along as best we can....

 

[hopeless]

Re: 1986 Johnson 150GT

Thanks, First thing I will check is for the grounded wire. It can not be overheating as the buzzer goes off before I ever start the boat. This is very random, as I may take the boat out 2 or 3 times and it won't happen at all.

 

[j_k_bisson]

Re: 1986 Johnson 150GT

Um, it is supposed to buzz when you first turn on the ignition. It to let you know the system is working...

 

[hopeless]

Re: 1986 Johnson 150GT

I know it is supposed to buzz for a second to let you know it is working, but it stays on for random amounts of time when is acting up. Anywhere from 5-10 seconds up to 2 to 3 minutes or more. As soon as it quits raining I am going to check out what I can

 

[j_k_bisson]

Re: 1986 Johnson 150GT

Ok, if it is buxxing, start by disconnecting the two heat sensors in the heads, then the fuel pressure sensor. Those are the common ones..... Then it's anyones guess.....

 

[emdsapmgr]

Re: 1986 Johnson 150GT

If the horn buzzes for a second or two when you first start your engine-that's normal. It is also possible on that model that the horn itself is defective.

 

[hopeless]

Re: 1986 Johnson 150GT

I went out side and started the boat. When I turned the key on the horn started buzzing. Before I could get to any wires it quit. Probably sounded for 30 seconds. I turned the key off and back on and the horn was quiet. I started the boat and ran it with a water boot. Tachometer worked fine. Ammeter showed engine was charging. I could hold my hands to both heads for as long as I wanted. They were maybe 125 to 150 degrees? There was plenty of smoke so I know it was getting oil. In other words, every thing worked as it was supposed to. NO HORN I can't figure this one out.

 

[hopeless]

Re: 1986 Johnson 150GT

I have a water pressure gauge, and it read about 10lbs at idle and 15 t0 20 at 3500rpm

 

[clanton]

Re: 1986 Johnson 150GT

Horn defective. Like poster # 8 said.

 

[hopeless]

Re: 1986 Johnson 150GT

I have felt it may be a defective horn for awhile. Does anyone know how to disable the horn. I do all my maintenance and am willing to take the chance that the horn will save me. I ran outboards before any warning systems and seemed to survive. I know that s---t can happen, but I can't listen to that horn anymore. Thanks to everyone that replied to my post.

 

[Joe Reeves]

Re: 1986 Johnson 150GT

The three (3) wire warning horn, which is what you have can be tested as follows for the problem you're encountering.

Have the horn where you can get at it to begin with.

The wiring of the horn should be that the TAN wire is attached to the slide on terminal closest to the built in black ground wire, with the purple wire attached to the other slide on terminal. If reversed, weird things will happen!

If the wiring is as it should be. Turn the key to the ON position. Hopefully the horn starts to and stays beeeeeeeeeping. If so, remove the TAN wire from the horn. If the horn continues to beeeeeeeeeep, the horn is faulty. If the horn stops beeeeeeeping immediately, the horn is okay and a problem would exist with one of the sensors.

If a faulty sensor, start disconnecting the sensors at the engine, one at a time (oil tank, 2 heat sensors, VRO electrical plug, vaccum switch) . When the beeeeeeping stops, you've found the offending sensor.

 

[tnduc]

Re: 1986 Johnson 150GT

The three (3) wire warning horn, which is what you have can be tested as follows for the problem you're encountering.

Have the horn where you can get at it to begin with.

The wiring of the horn should be that the TAN wire is attached to the slide on terminal closest to the built in black ground wire, with the purple wire attached to the other slide on terminal. If reversed, weird things will happen!

If the wiring is as it should be. Turn the key to the ON position. Hopefully the horn starts to and stays beeeeeeeeeping. If so, remove the TAN wire from the horn. If the horn continues to beeeeeeeeeep, the horn is faulty. If the horn stops beeeeeeeping immediately, the horn is okay and a problem would exist with one of the sensors.

If a faulty sensor, start disconnecting the sensors at the engine, one at a time (oil tank, 2 heat sensors, VRO electrical plug, vaccum switch) . When the beeeeeeping stops, you've found the offending sensor.

First off I will apologize for reviving an old post but when I searched this is the closest to my issue. I have a 1991 90 hp Evinrude and the horn comes on and stays on as soon as I turn the key. The horn is new as I I replaced the old one when the problem started. The problem has continued. I unplugged the tan wire and the buzzing stops. Now, I am not sure which VRO wire to unplug or the heat sensor wires to check if those are the problems. Can I get a good description of what I am looking for?

 

[Joe Reeves]

The VRO only has one plug... just unplug it.....

The oil tank only uses 2 wires. looks like old black lamp cord. The plug in is usually laying on the port side of the powerhead....

The heat sensor leading out of the starboard cyl head has but one wire....

Whatever color that wire is, the sensor in the 2 wire port heat sensor would be the same coloration.

Keep in mind that if all the sensors check out okay... the problem then would be that the Tan wire leading from the horn must be shorted out somewhere.

 

[GA_Boater]

First off I will apologize for reviving an old post but when I searched this is the closest to my issue. I have a 1991 90 hp Evinrude and the horn comes on and stays on as soon as I turn the key. The horn is new as I I replaced the old one when the problem started. The problem has continued. I unplugged the tan wire and the buzzing stops. Now, I am not sure which VRO wire to unplug or the heat sensor wires to check if those are the problems. Can I get a good description of what I am looking for?

Too hard to start new thread? And it's only close to your issue.

Closed.