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Yamaha Kill Switch wires

Old 11-21-2016, 06:57 AM
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clv
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Thanks for the update Sk8Sufr. Will you try the normally open relay as suggested by Dacman or the normally closed relay recommended by Fell?
For myself, my systems are still under warranty and I will look for a Yamaha accepted answer for DEC controlled rigging.
Please keep us updated.
Old 11-21-2016, 07:56 AM
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Originally Posted by clv View Post
Thanks for the update Sk8Sufr. Will you try the normally open relay as suggested by Dacman or the normally closed relay recommended by Fell?
For myself, my systems are still under warranty and I will look for a Yamaha accepted answer for DEC controlled rigging.
Please keep us updated.

Not sure......... kinda hoping Dacman will chime in. I don't have a normally closed relay diagram so I might go with the open one!
Old 11-22-2016, 03:16 PM
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Originally Posted by Sk8Surfr View Post
Not sure......... kinda hoping Dacman will chime in. I don't have a normally closed relay diagram so I might go with the open one!
Do your original kill switch circuits open the circuit or close it when the lanyard is pulled to kill the motors? You stated that you had the new kill switch hooked up on orange which is open to kill and they did kill when open. I'm not fluent with diode applications . A dpdt relay is available for either way.
Old 11-24-2016, 07:16 AM
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Hooked it up like you suggested Dacman and it works perfect! Thank you for all your help!
Old 11-24-2016, 07:25 AM
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Originally Posted by Sk8Surfr View Post
Hooked it up like you suggested Dacman and it works perfect! Thank you for all your help!
Awesome. Yrw.
Old 12-30-2017, 08:18 AM
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I apologize for the revival of an old thread. I too am having issues with the connections of the MOB. My lanyard kill switch has 6 wires. It only has one key and two start stop buttons for the Yamahammer 300's. They appear to be paired. Each pair is a black wire and white wire. I have been searching many sites for the wiring diagrams for this 6 wire lanyard and coming up empty! Anyone have any diagrams or anything to add other than call Fell as I was really wanting to get this done this weekend. Thank you!
Old 12-30-2017, 11:23 AM
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I would think that a 3pst no 12v dc relay would get it done , but finding an encapsulated one seems to elude me.
Old 12-30-2017, 11:57 AM
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Here you are
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Old 12-30-2017, 12:36 PM
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Originally Posted by alloyboy View Post
Here you are
This relay should work , have the MOB supply 12 volts dc to the relay coil for a kill signal.
MOB normally open contacts to close 12v + to one relay coil lead and the other coil lead to -
supply when activated. When the kill switch activates it will close the relay and close all three kill contacts.

https://www.amazon.com/Enclosed-Rela...ices+%28RIB%29

Hope this makes sense.
Old 12-30-2017, 12:55 PM
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I don't know what Yamaha motors you have but my pair works off one key and two start buttons. When I turn the key off both motors go off.
Old 12-30-2017, 01:31 PM
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Originally Posted by alloyboy View Post
Here you are
Thank you! That’s exactly what I needed!
Old 12-30-2017, 01:32 PM
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Originally Posted by THE BARRACUDA View Post
I don't know what Yamaha motors you have but my pair works off one key and two start buttons. When I turn the key off both motors go off.
Yep, that’s what I have. But if you look at the wires on the kill switch it has 6, not 2 or 4 like all the posts I’ve been reading.
Old 12-30-2017, 01:45 PM
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Originally Posted by Vantaredoc View Post
Yep, that’s what I have. But if you look at the wires on the kill switch it has 6, not 2 or 4 like all the posts I’ve been reading.
Take note that in a twin application only four of the wires are used. One pair for each motor.

In a triple application all six wires would be used. One pair for each motor.

Last edited by alloyboy; 12-30-2017 at 02:58 PM.
Old 12-30-2017, 02:05 PM
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They probably use the same kill switch for twins and trips. Only with twins all the wires are not used or run to the plug circled in red. Find out which ones are connected at the plug.

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Old 12-30-2017, 02:51 PM
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So after looking things over I went to my parts shelf and found a couple of these relays and bases. I will put the factory lanyard kill on the “nc” contacts, the black and white wires to engine on the common contacts and have the MOB trigger the relay. I really only need one double pole relay as you can simply parrallel one of the pairs.
Old 12-30-2017, 03:00 PM
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[QUOTE=Dacman;10968085]They probably use the same kill switch for twins and trips.

It is a bit more than "probably".
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Old 01-01-2018, 10:15 AM
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Originally Posted by alloyboy View Post
Here you are
Is there a possibility that you have the motor side of this drawing? What I'm seeing is battery voltage on the white wire and ground to battery on the black wire. When you jump the white and black it appears to be simply grounding the circuit to stop like a lawnmower grounds out the coil or points. If this is the case, I only need to interrupt the white wires with my double pole relay and simply put the factory side to NC and the engine harness side to common. Then simply connect ground to the NO contacts. Use the MOB to give me power to my relay and that should do the same thing. I would just like to verify that the Black wires do indeed originate at the ground of the engine and not being fed by the ecm's of the engines. I ohmed the black wires and they have continuity to ground as well as each other. Thank you.
Old 01-01-2018, 10:51 AM
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All Yamaha's are made to stop running when the white wire is grounded to the black wire.

In a Yamaha, black is black is black. It is a ground to the block.
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Old 01-01-2018, 11:02 AM
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Originally Posted by alloyboy View Post
All Yamaha's are made to stop running when the white wire is grounded to the black wire.

In a Yamaha, black is black is black. It is a ground to the block.
Thank you for the quick reply. I wonder what the reasoning for separating them at the kill switch? At the end of the day, they might be separated at the kill switch, but if I pull the lanyard, they are still all connected together since they go back to the grounds of the batteries which are all connected together. I wonder why you can’t simply connect the MOB in parallel without any separation? If I had two separate keys I might see it. What am I missing?
Old 01-01-2018, 11:04 AM
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Originally Posted by Vantaredoc View Post
Thank you for the quick reply. I wonder what the reasoning for separating them at the kill switch? At the end of the day, they might be separated at the kill switch, but if I pull the lanyard, they are still all connected together since they go back to the grounds of the batteries which are all connected together. I wonder why you can’t simply connect the MOB in parallel without any separation? If I had two separate keys I might see it. What am I missing?
I guess they could have some sort of issue charging if they were both running. I should stick with my relay idea so they will separate when engines actually running...

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