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ContinuousWave: Small Boat Electrical
Deduce Purpose of Wires From Picture
|Author||Topic: Deduce Purpose of Wires From Picture|
posted 09-14-2011 08:36 PM ET (US)
Hey all--I am trying to connect a new tachometer to a 2006 Mercury 40-HP EFI. When the previous owner re-powered my 13-foot Dauntless he did not do this. I see there is a wiring harness and then about five other wires coming out [from somewhere]. [Do] I need the harness to connect? Or, [do I] just use those other wires to connect a new tachometer? Let me know what you think after looking at this picture.
posted 09-14-2011 09:40 PM ET (US)
I followed your hyperlink but I could not make any inference from the picture.
Most outboard engine manufacturers use a consistent coding of the insulation color of the wire in their harnesses. I have collected and organized information about wire insulation color as an indicator of function in outboard engine wiring. See my results at
posted 09-14-2011 10:00 PM ET (US)
Thanks Jim. Those wires are coming out of the bottom of side-mounted control box. Do I need to plug something into the wire harness? Or, could I install the tachometer to those other wires? I am guessing the harness is for Mercury gauges and the other are for gauges from other manufacturers or something.
posted 09-15-2011 08:39 AM ET (US)
It would be typical that on an engine wiring harness there is a pre-wired connector to which a mating connector can be attached and used to conduct the electrical signals to gauges. The wire colors are not visible and you have not given information on the wire colors. Generally you can deduce the function of the wires in the outboard engine wiring harness by the color of their insulation.
posted 09-15-2011 09:33 AM ET (US)
If your setup is the same as on on my EFI four stroke you can get a harness from Mercury which will connect the existing engine wiring to various analog gauges including a tachometer. I got mine from BassPro Shop for about $40. You can beat the price on-line but as they are about 1/4 mile from my home I try to use them.
Otherwise I believe you can buy a SmartCraft Tachometer for a lot more money, connect it directly to your existing wiring package, and enjoy other useful readouts. Did I say a LOT more money?
I suggest you speak with a Merc Tech before proceeding. If it will help I'll check the packaging and provide the SKU to you.
posted 09-15-2011 10:24 AM ET (US)
Jefecinco, I don't think I will be spending the 700 or so dollars for the Smartcraft stuff for a 13' Duantless but thanks for the info. I am actually going to the Cedar Point in water boat show tonight where the local BW and Mercury dealers have a booth and I hopefully can talk to them.
If you could get me that info it would be great. I really want to get some gauges working again, I hate running without knowing my RPMs.
posted 09-16-2011 10:40 AM ET (US)
Will respond this PM.
posted 09-16-2011 02:11 PM ET (US)
The Quicksilver part number for the harness is: 84 892990T01. The nomenclature is: Harness Asy - Analog Gauge. The price was $35.00.
I hope this works for you.
posted 09-16-2011 02:26 PM ET (US)
Thanks Jefecinco! That appears to be what I am looking for, I am going to check with a local dealer to be sure. Now I just have to plug that in and get the gauges and I will be good to go.
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