GT40 Tach Signal

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   Hi all,

Does the tach signal on a GT40 come from the coil?  Gray wire?  Have an intermittent 'spikey' tach and would like to get to the bottom of it.  More irritating than anything else.

Cheers,

D.

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2001SAN Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: June-26-2012 Location: Ireland Status: Offline Points: 246	Post Options Post Reply Quote 2001SAN Report Post Thanks(0) Quote Reply Topic: GT40 Tach Signal Posted: July-31-2013 at 9:35pm
	Hi all, Does the tach signal on a GT40 come from the coil? Gray wire? Have an intermittent 'spikey' tach and would like to get to the bottom of it. More irritating than anything else. Cheers, D.
	A little knowledge is a dangerous thing... 2001 Super Air Nautique 1989 Fairline Corniche 31 www.bannrivercruises.co.uk

lewy2001 Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234	Post Options Post Reply Quote lewy2001 Report Post Thanks(0) Quote Reply Posted: July-31-2013 at 9:51pm
	The "tach" signal comes from the grey wire on the coil it has a 22K ohm resistor in series that makes the signal compatible with most tach's.
	If you're going through hell, keep going 89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta

2001SAN Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: June-26-2012 Location: Ireland Status: Offline Points: 246	Post Options Post Reply Quote 2001SAN Report Post Thanks(0) Quote Reply Posted: August-01-2013 at 8:53am
	Cheers Lewy. Thanks for confirmation.
	A little knowledge is a dangerous thing... 2001 Super Air Nautique 1989 Fairline Corniche 31 www.bannrivercruises.co.uk

lewy2001 Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234	Post Options Post Reply Quote lewy2001 Report Post Thanks(0) Quote Reply Posted: August-01-2013 at 9:07am
	I would check and clean all connections. Try and confirm that it is not the tach by trying a shop tach or similar. It could also be noise coming from the TFI ignition module. Is yours the original tach or the Faria replacement. Have heard of a few problems with the Faria replacements jumping around and reading low.
	If you're going through hell, keep going 89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta

2001SAN Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: June-26-2012 Location: Ireland Status: Offline Points: 246	Post Options Post Reply Quote 2001SAN Report Post Thanks(0) Quote Reply Posted: August-01-2013 at 4:04pm
	Faria, It def jumps around at times. Maybe reads a little high according to my idle.
	A little knowledge is a dangerous thing... 2001 Super Air Nautique 1989 Fairline Corniche 31 www.bannrivercruises.co.uk

GT40 Tach Signal

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