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Author Topic:   Yamaha T8, Remote control 7- or 10-pin Wiring Harness
JOHN W MAYO posted 09-03-2005 01:45 PM ET (US)   Profile for JOHN W MAYO   Send Email to JOHN W MAYO  
I am considering the Yamaha High Thrust T8 on my Revenge 19. I have a new Yamaha 703 remote control that has a 7-pin wiring harness with no trim button. Do any of our members that have the T8 know if the engine uses a 7-pin wiring harness without the hyd lift?

Is the T8 with hyd lift 10-pin?

Or both use the same wiring harness of what number pins?

I have read about all the post on the kicker motors but have not found anything related to my queston on the wiring harness.

Also, I have not found any additional weight factor of the hydraulic system anywhere. Any idea how much extra weight that would add?

kingfish posted 09-05-2005 06:04 PM ET (US)     Profile for kingfish  Send Email to kingfish     

Thr Electric Start T8 uses a 10-pin harness.


JOHN W MAYO posted 09-06-2005 09:31 PM ET (US)     Profile for JOHN W MAYO  Send Email to JOHN W MAYO     
kingfish, thanks

I am trying to figure what to do with the Yamaha 703 remote control if it want work on a motor I am thinking about getting.

I could probably change the wireing harness but that might be $100 or so.

Does your T8 have tilt? What is your set up, and how do you like it, what would you different?

kingfish posted 09-07-2005 10:11 AM ET (US)     Profile for kingfish  Send Email to kingfish     
My motor has electric tilt - JimH has filed an article about my installation here:

I love the set up. With some investigation and ingenuity you could wire a 7-pin adaptor into the 10-wire harness, or you could pay your marina to do it. I used an OMC dual binnacle mount control, and wired the adaptor(s) myself to run the correct wires from the Yamaha 10-wire harness into the OMC control.

I'm not sure I'd do anything differently, with the possible exception of exploring in more depth a less expensive tie bar.

JOHN W MAYO posted 09-08-2005 12:27 PM ET (US)     Profile for JOHN W MAYO  Send Email to JOHN W MAYO     
Very good article. I have read it several times. Nice instalation.

Do you know if that adapter is something you can buy, or it sounds like it might be something you have to make?

How much weight does that hyd lift add to the motor would you guess? I have not been able to find that information anywhere.
The weight on my transom is a concern. Thanks.

kingfish posted 09-09-2005 09:04 AM ET (US)     Profile for kingfish  Send Email to kingfish     
I am of the opinion that my T8 weighs about 110 pounds, though I don't know that for sure. I'm not familiar with what you will need to plug into on the back of your 703, and if the ignition switch is integral to the control or separate (in which case you may need more than one plug). You should be able to take your 703 to a Yamaha mechanic and have him identify what plug or plugs you will need, and then order them making sure there is a short pigtail of coded wires connected. You should then be able to cut the main harness to length if necessary (err to the long side rather than to the long side), and using heat shrink butt connectors, connect similarly coded wires from the harness to the plug(s). If pigtails aren't available, I'd stop right there and have the Yamaha mechanic do the adaption for you.

I believe the T8 only comes with electric tilt, so the 10-pin configuration almost certainly includes the 3 wires necessary for that feature. Since you say the 703 doesn't include a trim control, you'll need to decide if you will only operate the electric tilt from the button on the motor, or if you will want to utilize the wires in the cable harness and create a seperate remote tilt switch near where you locate the 703.

JOHN W MAYO posted 09-09-2005 01:31 PM ET (US)     Profile for JOHN W MAYO  Send Email to JOHN W MAYO     
Thanks kingfish,
I was wondering how much more the electric tilt weighed than manaul tilt. I have not been able to find it in print anywhere. You have a very admireable setup on your Whaler. When I talked to Chuck at B/W, he had a big concern if I added that much weight to my transom. My whaler is only a 19 and yours is a much bigger boat.
LHG posted 09-09-2005 06:19 PM ET (US)     Profile for LHG    
For what it's worth, the Yamaha 2005 catalog shows the 20" T8, without the power trim option, at 102#.

Mercury shows it's 20" electric start 9.9 Pro Kicker at 96# without power trim, and 107# with it, so it seems like the PT unit is about 11#. I would imagine the Yamaha unit would be similar in weight. So John's engine would weigh about 113#? Mercury does not make an 8 HP version of the Pro-Kicker.

JOHN W MAYO posted 09-10-2005 01:34 PM ET (US)     Profile for JOHN W MAYO  Send Email to JOHN W MAYO     
Thanks LHR,

It is apparently much less weigth to contend with than I thought it would be for the electric trim.

That weight would be about:

466 Yamaha F150
113 T8
=579 lbs on the transom of a 1976 Revenge 19.
100 lbs 2 batteries at the aft location
=679 lbs total.

Chuch at Boston Whaler expressed concerns to me that might be to much weight, the early Whalers did not have a transom max weight. It may have a tendency to porpuse some.

With the Revenge having that extra wood and fiberglass up front that I would guess to be maybe 200-250 lbs, and if I moved the batteries forward , rewired with #2 or #4 awg , maybe I would not have a problem.

Thanks for you input.

kingfish posted 09-13-2005 03:17 PM ET (US)     Profile for kingfish  Send Email to kingfish     
OK, here's what I think the weight is accurately for a Yamaha T8PLRD (T=high thrust; 8=8hp; P=power tilt; L=long [20"] shaft; R=remote control [no tiller arm]; D=2005): 107#

This is an electric start model with a 6 amp charging system and is exactly like mine (T8PLRC) except it is a year newer.

JOHN W MAYO posted 09-14-2005 10:39 PM ET (US)     Profile for JOHN W MAYO  Send Email to JOHN W MAYO     
Thanks kingfish for all the information.
acadian posted 04-07-2008 09:03 AM ET (US)     Profile for acadian  Send Email to acadian     
i have just bought a yamaha 30 hp i think it is 1992 it takes a 7 pin harness i need the harness and control box if any one out there wants to sell one please let me know
dino54904 posted 04-08-2008 11:35 AM ET (US)     Profile for dino54904  Send Email to dino54904     
Hi John,

I put a Yamaha T8 w/out tilt but with electric start on my 1972 Outrage 19 last year. The boat did squat a bit in the stern so I added 75# of lead shot in the forward most section of the bow with the weight offset to the port side (the T8 is mounted on the stbd side of the transom. This leveled out the trim of the boat and she rides great. The T8 is wonderful especially for trolling.

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