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Old 31 July 2010, 08:36   #1
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Wiring help needed for Tacho for Mariner 60hp

Hello,

I'm hoping someone can help me wire in a Tacho for my 1994 Mariner 3 cylinder 60hp 2 stroke.

I have purchase a Mercury Tacho which has three connectors on the back; 'SEND', 'GND', and 'IGN' plus cycle and pulse setting. I've taken a photo:

http://www.cuedev.co.uk/P7310491.JPG

Then I have my wiring which come out of the control box:

Light Brown: ?
Light Brown with Blue strip: ?
Pink: Ignition/Live
Grey: ?
Black: Earth
Dark Brown with White Stripe: ?

I've also take a pic:

http://www.cuedev.co.uk/P7310492.JPG

I'm assuming the 'IGN' goes to the Pink wire on the console; 'GND' goes to the Black wire on the console. Now which one does the 'SEND' go to? Also what is the setting for the Cycle/Pulse?

Any help would be greatfully recieved.

Thank you in advance.
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Old 31 July 2010, 09:37   #2
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Ign requires a 12v supply, should be a purple wire from ignition switch

GND - black earth wire

Send - should be a grey wire coming from the engine harness

Tan(light brown) is an accessory feed or goes to temp gauge on some
tan/blue - warning horn
brown/white should go to your trim gauge

just to confuse you even further...
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Old 31 July 2010, 12:50   #3
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I found this quite helpfull recently for getting an old tacho going again




HTH
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Old 31 July 2010, 14:11   #4
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Excellent. Thank you.
What about this pulse setting? Any ideas?
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Old 31 July 2010, 14:18   #5
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Not sure about that, doesn't seem to have a 3 cyl setting. It says "4 cycle engine" on the back, I wonder if it's a four stroke only part?
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Old 31 July 2010, 16:48   #6
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Quote:
Originally Posted by martini View Post
Not sure about that, doesn't seem to have a 3 cyl setting. It says "4 cycle engine" on the back, I wonder if it's a four stroke only part?
could be where you take the signal wire for the tacho from, when i built my westfield the tacho was connected to the coil
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Old 02 August 2010, 07:05   #7
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The tacho counts the pulses from the alternator. Number of cylinders and 2/4 stroke should be irrelevant. Different engines use different numbers of magnets in the alternator, so you could get 2, 4, 6 or in some obscure cases 10 pulses per rev.

Set it to the lowest one, with the engine idling. If you get something like an indicated 1500 RPM, switch off, and set it to the next one. The setting is the one that gives you somewhere around 7-800 rpm at idle. (maybe someone with a book of words could tell the actuial idle speed) then go for a spin & check where it tops out. If it goes off the scale, you're still too low!
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