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Old 27 February 2013, 12:15   #1
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How many poles?

I have an old yam built mariner forty, one of the two cylinder variety and I can't seem to find out how many poles it has?

The reason that I ask is that I am starting to put the boat back together now, so I hooked up all my new wiring and my tachometer and started her up.

With the help that I received on a previous thread the kill switch and choke worked and the tachometer seemed to work, but when I reved the engine (in neutral and on muffs) so not much the tachometer would advance and then drop back?

Hence I thought maybe I had it set on wrong number if poles?
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Old 27 February 2013, 12:21   #2
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If you're holding the revs steady and the revcounter is dropping, there's a problem with your revcounter. If you get the number of poles wrong it'll still work,but it'll read either slow or fast.


It is connected up to the right place in the outboard isn't it?
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Old 27 February 2013, 17:32   #3
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I think so, it is connected to the green wire.

I think i might need to test it on the water and see what it does when I can open the throttle

I just thought it didn't look quite right? Could it be the timing? I am sure someone told me when you first apply revs, the timing advances. Could it be this that I am seeing on the counter?
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Old 27 February 2013, 17:37   #4
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Could it be the timing? I am sure someone told me when you first apply revs, the timing advances. Could it be this that I am seeing on the counter?
The timing does advance, but no, that's not what you're seeing.Your revcounter reading isn't linked to your timing.
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Old 27 February 2013, 17:45   #5
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Hmmmm

I have just found this on the net: "Some Mariner/Mercury 30 & 40 HP (2 cylinder) non-USA built engines may require a Module (Mercury P/N 17461A2) when using any of these tachs"

That part number isn't yeilding anything on the net though....
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Old 27 February 2013, 17:51   #6
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I've never come across one of them-but the tach system is fairly simple-all it does is count the number of pulses from the alternator.

Have you got an electric start or a battery charging system and what make is the tach?
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Old 27 February 2013, 18:13   #7
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Well the engine is pretty old but it does have electric start so I think it must have an alternator, the tach is a quiksilver one.
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Old 28 February 2013, 18:25   #8
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I think my engine my have a magneto ignition and maybe a lighting coil the more research i do, is this substantially different from an alternator?
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Old 28 February 2013, 19:22   #9
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I think my engine my have a magneto ignition and maybe a lighting coil the more research i do, is this substantially different from an alternator?
There's usually 1 coil for each cylinder plus a lighting or generator coil for charging a battery .
So if its a 2 cylinder there will be 3 in total .

An alternator will produce much more power output than a simple lighting coil .
One advantage with a lighting coil though is it will charge up a completely flat battery unlike most Alternators that need a bit of power or a certain amount in the battery before it will start to charge up proper .

Usually if the engine has an electric starter & its powered by a lighting coil there will be a rectifier to change it from Ac into Dc for charging a battery .
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Old 28 February 2013, 19:29   #10
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Sorry, meant to reply earlier.

Turbodiesel would be your man here-he'll remember/know what it's got under the flywheel. Got a serial number and model number?

I strongly suspect it's an alternator though- a lighting coil isnt enough to recharge a battery with an electric start. You should have 2 wires coming out from under the flywheel that are connected to a rectifier. One of those should also be connected to the revcounter.
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