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Author Topic:   Yamaha 703 Remote Control

Vic633 posted 11-29-2008 04:46 PM ET (US)
I have a c.1994 Yamaha 40 on my 13-foot Boston Whaler boat, and my console is a bit of a rat's nest of wiring. I am trying to work my way through it and clean it up. I have five wires coming out of the control box. Two black, one yellow, one green and one pink. The black are ground, the yellow is power but the pink (oil over heat signal ground) and the green (Tachometer) don’t seem to go anywhere. I am a little concerned about the over heat pink wire. Where should it go? Is it mandatory, and why are there two black (ground) wires? Any help would be appreciated.

jimh posted 11-29-2008 05:31 PM ET (US)
Generally the Yamaha outboard owner's manual will show the electrical wiring in detail, although the diagram is very small and you may need a magnifying glass to read it. If you have the owner's manual for the engine check the back pages for a detailed schematic diagram that shows the wiring harness and how it connects to the remote controls and other electricals.
A tachometer is optional, and if you don't have one there is no place for the tachometer signal to go. You just leave the green-insulated conductor hanging.
Alarm sensor signals typically go to some sort of alarm signal, either an aural alarm alert sounder or an annuciator lamp.

jimh posted 11-29-2008 05:38 PM ET (US)
Wiring color codes are listed in the REFERENCE section and may be useful in interpreting what a wire's function is from the color of its insulation. However, be careful with any wiring added after the boat and motor left the manufacturer, as dealers and previous owners often pay no attention to color codes, and you may find wiring with all sorts of colors used for all sorts of functions.
http://continuouswave.com/whaler/reference/wireColorCode.html
Vic633 posted 11-29-2008 06:01 PM ET (US)
The reference section was instrumental in determining what the colours meant. I do not have the owner’s manual nor can I find one online. The wires I’m referring to are directly from the control unit and have not been spliced or altered in any way. My biggest concern is that the pink wire which is "oil and overheat signal ground" is not connected to anything. Does the remote control unit itself have an audible alarm built in? Could this wire be meant to be connected to a warning light? I don’t like the thought of leaving this wire unconnected.
Slick 50 posted 11-29-2008 08:05 PM ET (US)
According to my 1984-1988 3 cylinder Seloc manual, you have a black, yellow and pink that go to an oil level warning lamp for the dash. You also have a black and green for the tach. I did not use the black, yellow and pink wires.
jimh posted 11-30-2008 12:07 AM ET (US)
I am not certain of this, but it is very likely that the PINK wire goes to ground when there is an alarm condition. You could wire up a lamp or an aural alert (a sounder or buzzer) as follows:
POSITIVE (+) to the YELLOW
NEGATIVE (-) to the PINK
When there is an alarm condition the PINK will go to ground and current will flow through the lamp or the aural alert device. Usually a lamp does not have polarity, but a sounder might.
Maybe someone with an owner's manual can make a Xerox of the schematic or scan it for you. I made an enlargement on my copier so I could read the thing, as the print was very small.
Yamaha sells a nice tachometer with digital read out and it has warning lights for oil level and temperature built into it. It can be expensive if purchased new. Check for a used one on an on-line auction website or at a surplus parts dealer--lots of those in Florida and on-line, too.
Vic633 posted 11-30-2008 10:21 AM ET (US)
I will do some searching on line, that tachometer you were describing sounds perfect. If I cant find one, or the price is to high I am going to follow your first idea and attach the wires to a warning light in the dash... and cross my fingers I never see it on.
Thanks
Slick 50 posted 11-30-2008 10:28 AM ET (US)
I don't think you need to use the black, yellow and pink wires to have low low oil level protection. Under the cowling you have a green/red wire from the oil tank that goes to the thermal switch and from there to the CDI. It appears to me the black, yellow and pink wires are used for level indication/warning only.
The manual I have indicates three different engine identifications for the 90's. The three are very similar. All three have the same green/red wire from oil tank to thermal switch and then to the CDI for low/low oil level protection and then buzzer alert through the main engine harness to the remote control box.
This is how it appears to me but am open to learn.
Slick 50 posted 11-30-2008 10:48 AM ET (US)
I just realized I am a dummy. I am bent on helping you with a 90HP engine and you have a 40HP.
Sorry about that.

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Author	Topic: Yamaha 703 Remote Control
Vic633	posted 11-29-2008 04:46 PM ET (US) I have a c.1994 Yamaha 40 on my 13-foot Boston Whaler boat, and my console is a bit of a rat's nest of wiring. I am trying to work my way through it and clean it up. I have five wires coming out of the control box. Two black, one yellow, one green and one pink. The black are ground, the yellow is power but the pink (oil over heat signal ground) and the green (Tachometer) don’t seem to go anywhere. I am a little concerned about the over heat pink wire. Where should it go? Is it mandatory, and why are there two black (ground) wires? Any help would be appreciated.
jimh	posted 11-29-2008 05:31 PM ET (US) Generally the Yamaha outboard owner's manual will show the electrical wiring in detail, although the diagram is very small and you may need a magnifying glass to read it. If you have the owner's manual for the engine check the back pages for a detailed schematic diagram that shows the wiring harness and how it connects to the remote controls and other electricals. A tachometer is optional, and if you don't have one there is no place for the tachometer signal to go. You just leave the green-insulated conductor hanging. Alarm sensor signals typically go to some sort of alarm signal, either an aural alarm alert sounder or an annuciator lamp.
jimh	posted 11-29-2008 05:38 PM ET (US) Wiring color codes are listed in the REFERENCE section and may be useful in interpreting what a wire's function is from the color of its insulation. However, be careful with any wiring added after the boat and motor left the manufacturer, as dealers and previous owners often pay no attention to color codes, and you may find wiring with all sorts of colors used for all sorts of functions. http://continuouswave.com/whaler/reference/wireColorCode.html
Vic633	posted 11-29-2008 06:01 PM ET (US) The reference section was instrumental in determining what the colours meant. I do not have the owner’s manual nor can I find one online. The wires I’m referring to are directly from the control unit and have not been spliced or altered in any way. My biggest concern is that the pink wire which is "oil and overheat signal ground" is not connected to anything. Does the remote control unit itself have an audible alarm built in? Could this wire be meant to be connected to a warning light? I don’t like the thought of leaving this wire unconnected.
Slick 50	posted 11-29-2008 08:05 PM ET (US) According to my 1984-1988 3 cylinder Seloc manual, you have a black, yellow and pink that go to an oil level warning lamp for the dash. You also have a black and green for the tach. I did not use the black, yellow and pink wires.
jimh	posted 11-30-2008 12:07 AM ET (US) I am not certain of this, but it is very likely that the PINK wire goes to ground when there is an alarm condition. You could wire up a lamp or an aural alert (a sounder or buzzer) as follows: POSITIVE (+) to the YELLOW NEGATIVE (-) to the PINK When there is an alarm condition the PINK will go to ground and current will flow through the lamp or the aural alert device. Usually a lamp does not have polarity, but a sounder might. Maybe someone with an owner's manual can make a Xerox of the schematic or scan it for you. I made an enlargement on my copier so I could read the thing, as the print was very small. Yamaha sells a nice tachometer with digital read out and it has warning lights for oil level and temperature built into it. It can be expensive if purchased new. Check for a used one on an on-line auction website or at a surplus parts dealer--lots of those in Florida and on-line, too.
Vic633	posted 11-30-2008 10:21 AM ET (US) I will do some searching on line, that tachometer you were describing sounds perfect. If I cant find one, or the price is to high I am going to follow your first idea and attach the wires to a warning light in the dash... and cross my fingers I never see it on. Thanks
Slick 50	posted 11-30-2008 10:28 AM ET (US) I don't think you need to use the black, yellow and pink wires to have low low oil level protection. Under the cowling you have a green/red wire from the oil tank that goes to the thermal switch and from there to the CDI. It appears to me the black, yellow and pink wires are used for level indication/warning only. The manual I have indicates three different engine identifications for the 90's. The three are very similar. All three have the same green/red wire from oil tank to thermal switch and then to the CDI for low/low oil level protection and then buzzer alert through the main engine harness to the remote control box. This is how it appears to me but am open to learn.
Slick 50	posted 11-30-2008 10:48 AM ET (US) I just realized I am a dummy. I am bent on helping you with a 90HP engine and you have a 40HP. Sorry about that.