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| Tach Problems / Wiring Diagram? |
| Author |
Message |
    
Rick Root
Member
Username: rickroot
Post Number: 17
Registered: 05-2008
| | Posted on Wednesday, May 07, 2008 - 08:40 am: | 
|
I removed my tachometer the other day because it didn't work, at all. Unfortunately I failed to label the wires when I took them off. Black, Grey, and Purple wires were attached to it.
The new teleflex tachometer (in a MARPAC branded package) said that it should "go to zero" when the power is turned on.
I connected the black to ground, and I've tried the other two wires both ways (coil and send) and neither causes the tach to "go to zero" when I turn on the ignition.
Now, I haven't actually run the engine yet (doing so this evening) so who knows what'll happen.
But I couldn't find a valid wiring diagram that describes the purple and gray wires.
My boat is a 1985 Glastream Cutlass 172 with a MCM140 Mercruiser engine and an alpha one stern drive. |
Rick Root
Member
Username: rickroot
Post Number: 18
Registered: 05-2008
| | Posted on Wednesday, May 07, 2008 - 08:42 am: |
|
(and yes, I realize failing to label my wires was a mistake).
What happens when I power on - the tach goes down the first time but only to about 700 RPM. If I turn the ignition on and off numerous times, it goes up a little bit each time to as high as 1000 RPM.
It behaves exactly the same way with the gray and purple wires reversed. |
Rick Root
Member
Username: rickroot
Post Number: 19
Registered: 05-2008
| | Posted on Wednesday, May 07, 2008 - 08:54 am: |
|
Heh. Never mind.
http://www.boatfix.com/merc/Servmanl/13/13E4R2.PDF
I found the wiring diagram in Service Manual #13. Purple is "Ignition" and gray is "sender"
My tach is labeled "Coil" and "Sender" but I guess coil is the same as ignition =) |
Rod Stewart
Senior Member
Username: rod_stewart
Post Number: 1252
Registered: 08-2006
| | Posted on Wednesday, May 07, 2008 - 12:18 pm: |
|
Rick;
Good luck.
I think you have it correct.
It's nice when a plan comes together.
Rod |
Rick Root
Member
Username: rickroot
Post Number: 24
Registered: 05-2008
| | Posted on Wednesday, May 07, 2008 - 07:26 pm: |
|
update: tach seems to work now that I've got it connected properly. It goes to zero like it should and read about 500 rpm (ish) at idle. I don't like putting much gas on when I'm not in the water so I didn't really test much beyond that.
Oh, I also had it set to 4 pulse which is why it wasn't working.. changed it to 2 pulse 4 cylinder and it works =) |
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