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Author Topic:   Johnson warning horn

kaflanigan posted 10-23-2009 06:46 PM ET (US)
Johnson 100GT, J100STLCEM, R08226806.
Warning horn question, When I turn on the ignition I do get one short pulse beep, however, when testing the horn by disconnecting the temperature switch lead and grounding the warning horn lead nothing happens, no horn sound. What am I doing wrong in testing the horn?
Thanks
jimh posted 10-23-2009 10:14 PM ET (US)
Typically with an OMC alarm system if you remove the conductor with TAN insulation from the temperature switch on the uppermost cylinder head, and then you ground the TAN conductor, the warning horn will sound. If you don't get this response, you will have to investigate the horn itself. In older motors the alarm horn is configured in a WIRED-OR arrangement, and any alarm sensor going to ground should operate the horn.
jimh posted 10-23-2009 10:19 PM ET (US)
I think your motor is a 1989 model. It is probably pre-System Check alarm system. Check the continuity of the TAN conductors from the engine to the alarm. Perhaps there is a bad connection in one of the harness connectors.
kaflanigan posted 10-25-2009 11:25 AM ET (US)
Thanks
kaflanigan posted 10-25-2009 11:30 AM ET (US)
Thanks Jim,
Here's what I found so far if it makes any difference. I can disconnect the temp leads and the VRO connection and still get the initial beep when turning on the ignition, but when I disconnect the lead from the oil tank and turn on the ignition I do not get a beep from the horn.
kaflanigan posted 10-25-2009 02:31 PM ET (US)
also, on the alarm horn there are two terminals at the top, does it make a difference which one the purple wire is connected to? The bottom terminal has the TAN wire connected to it.
seahorse posted 10-26-2009 09:11 AM ET (US)

On the warning horn, the purple (violet) wire attaches to the spade connector with the + sign.
One bit of clarification, you ground the engine wiring harness tan wire to test the horn, not the tan wire from the temp switch on the cylinderhead. The keyswitch should be in the ON position for the testing.
To test the horn itself, ground the spade connector at the horn terminal to see if it sounds like it should.
newt posted 10-26-2009 09:37 AM ET (US)

quote:
To test the horn itself, ground the spade connector at the horn terminal to see if it sounds like it should.
Just to clarify, he should ground the spade connector that the tan wire is connected to. Correct?
kaflanigan posted 10-26-2009 11:18 AM ET (US)
Yes, the ignition is on, and I am grounding on the harness side of he connections, again nothing happens. The wierd part is, if I disconnect the oil tank and turn on the ignition, no beep of the horn untill I ground that harness wire, and I get one short beep.
seahorse posted 10-26-2009 09:49 PM ET (US)
There are 2 types of warning horns for the 1995 and earlier motors. The original horn had only 2 spade terminals on it. The later model horn has an additional short black ground wire attached. That horn has the self-test beep that you hear when first turning the key to ON. If you disconnect the black ground wire, then there is no initial beep.
jimh posted 10-27-2009 08:46 PM ET (US)
You cannot get an electrical circuit that is any simpler than this warning horn circuit. The horn is powered from the battery. A wire from the horn is grounded to make the horn sound. There are only three elements in the circuit:
--the power to the horn
--the horn
--the wires to ground
If the horn sounds at start-up, it more or less proves there is power and the horn works. This leaves the wires to ground as the source of the problem.
kaflanigan posted 10-28-2009 11:19 AM ET (US)
Thanks for the help.
By using this diagram (http://www.maxrules.com/graphics/omc_pics/REMCONTBOX.jpg), I did see that the TAN wire was connect to the wrong terminal at the alarm.
I had assumed the alarm was in working condition given the fact I had the intial beep at start up. Glad I teated it!


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Author	Topic: Johnson warning horn
kaflanigan	posted 10-23-2009 06:46 PM ET (US) Johnson 100GT, J100STLCEM, R08226806. Warning horn question, When I turn on the ignition I do get one short pulse beep, however, when testing the horn by disconnecting the temperature switch lead and grounding the warning horn lead nothing happens, no horn sound. What am I doing wrong in testing the horn? Thanks
jimh	posted 10-23-2009 10:14 PM ET (US) Typically with an OMC alarm system if you remove the conductor with TAN insulation from the temperature switch on the uppermost cylinder head, and then you ground the TAN conductor, the warning horn will sound. If you don't get this response, you will have to investigate the horn itself. In older motors the alarm horn is configured in a WIRED-OR arrangement, and any alarm sensor going to ground should operate the horn.
jimh	posted 10-23-2009 10:19 PM ET (US) I think your motor is a 1989 model. It is probably pre-System Check alarm system. Check the continuity of the TAN conductors from the engine to the alarm. Perhaps there is a bad connection in one of the harness connectors.
kaflanigan	posted 10-25-2009 11:25 AM ET (US) Thanks
kaflanigan	posted 10-25-2009 11:30 AM ET (US) Thanks Jim, Here's what I found so far if it makes any difference. I can disconnect the temp leads and the VRO connection and still get the initial beep when turning on the ignition, but when I disconnect the lead from the oil tank and turn on the ignition I do not get a beep from the horn.
kaflanigan	posted 10-25-2009 02:31 PM ET (US) also, on the alarm horn there are two terminals at the top, does it make a difference which one the purple wire is connected to? The bottom terminal has the TAN wire connected to it.
seahorse	posted 10-26-2009 09:11 AM ET (US) On the warning horn, the purple (violet) wire attaches to the spade connector with the + sign. One bit of clarification, you ground the engine wiring harness tan wire to test the horn, not the tan wire from the temp switch on the cylinderhead. The keyswitch should be in the ON position for the testing. To test the horn itself, ground the spade connector at the horn terminal to see if it sounds like it should.
newt	posted 10-26-2009 09:37 AM ET (US) quote: To test the horn itself, ground the spade connector at the horn terminal to see if it sounds like it should. Just to clarify, he should ground the spade connector that the tan wire is connected to. Correct?
kaflanigan	posted 10-26-2009 11:18 AM ET (US) Yes, the ignition is on, and I am grounding on the harness side of he connections, again nothing happens. The wierd part is, if I disconnect the oil tank and turn on the ignition, no beep of the horn untill I ground that harness wire, and I get one short beep.
seahorse	posted 10-26-2009 09:49 PM ET (US) There are 2 types of warning horns for the 1995 and earlier motors. The original horn had only 2 spade terminals on it. The later model horn has an additional short black ground wire attached. That horn has the self-test beep that you hear when first turning the key to ON. If you disconnect the black ground wire, then there is no initial beep.
jimh	posted 10-27-2009 08:46 PM ET (US) You cannot get an electrical circuit that is any simpler than this warning horn circuit. The horn is powered from the battery. A wire from the horn is grounded to make the horn sound. There are only three elements in the circuit: --the power to the horn --the horn --the wires to ground If the horn sounds at start-up, it more or less proves there is power and the horn works. This leaves the wires to ground as the source of the problem.
kaflanigan	posted 10-28-2009 11:19 AM ET (US) Thanks for the help. By using this diagram (http://www.maxrules.com/graphics/omc_pics/REMCONTBOX.jpg), I did see that the TAN wire was connect to the wrong terminal at the alarm. I had assumed the alarm was in working condition given the fact I had the intial beep at start up. Glad I teated it!