GT40 Tach Signal
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=31021
Printed Date: September-27-2024 at 5:22pm
Topic: GT40 Tach Signal
Posted By: 2001SAN
Subject: GT40 Tach Signal
Date 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.
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A little knowledge is a dangerous thing...
2001 Super Air Nautique
1989 Fairline Corniche 31
www.bannrivercruises.co.uk
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Replies:
Posted By: lewy2001
Date 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.
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http://www.correctcraftfan.com/diaries/details.asp?ID=2999" rel="nofollow - 89 Ski
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Posted By: 2001SAN
Date Posted: August-01-2013 at 8:53am
Cheers Lewy. Thanks for confirmation.
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A little knowledge is a dangerous thing...
2001 Super Air Nautique
1989 Fairline Corniche 31
www.bannrivercruises.co.uk
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Posted By: lewy2001
Date 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.
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If you're going through hell, keep going
http://www.correctcraftfan.com/diaries/details.asp?ID=2999" rel="nofollow - 89 Ski
<a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta
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Posted By: 2001SAN
Date Posted: August-01-2013 at 4:04pm
Faria,
It def jumps around at times. Maybe reads a little high according to my idle.
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A little knowledge is a dangerous thing...
2001 Super Air Nautique
1989 Fairline Corniche 31
www.bannrivercruises.co.uk
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