1976 tach filter
Thread Starter
Cruising
Joined: Jul 2016
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1976 tach filter
When i took the tach wire from fire wall out of plug (No Filter) and put it into The Dist cap,The tach works got a new tach filter wired up then put into filter nothing ,Put wire back into cap works but when you shut car off tach does not go to zero but if you turn key on no start goes to zero confused Do i need Filter thanks Help
Le Mans Master
Joined: Dec 2007
Posts: 6,422
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From: McHenry Illinois
When the key is off, the tach needle can settle anywhere, but goes to zero with key on. Seems like there is something wrong with the new filter, you should see no difference when it's inline but it protects the tach from hi voltage spikes.
Former Vendor
Joined: Aug 2006
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From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Original tachometer boards and our reproduction are made to hold the last signal received. So if you are idling at 700 when you turn off the key the tach should hold it pretty close. (aprox.. they still will drop depending on the condition of the analog movement). China made boards won't do this nor will the reproduction china tachometers.
Thread Starter
Cruising
Joined: Jul 2016
Posts: 10
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Original tachometer boards and our reproduction are made to hold the last signal received. So if you are idling at 700 when you turn off the key the tach should hold it pretty close. (aprox.. they still will drop depending on the condition of the analog movement). China made boards won't do this nor will the reproduction china tachometers.
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,852
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Thread Starter
Cruising
Joined: Jul 2016
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The tach did not work with the filter only without and the tach is steady when working what else could it be looked at what is intailed to take tach out ,not looking forward to that the new filter read 15.5 ohms old filter 16.5 ohms thanks for your wisdom and help al
Melting Slicks
Joined: Jan 2014
Posts: 2,478
Likes: 254
From: Downers Grove Illinois
Do you mean Kohms? 15.5 or 16.5 ohms sounds way too low. I assume you measured that from input to output, is that correct?
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Melting Slicks
Joined: Jan 2014
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From: Downers Grove Illinois
Thread Starter
Cruising
Joined: Jul 2016
Posts: 10
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tach filter
Based on the schematic in this thread it should reaod around 15.6 Kohms.
Melting Slicks
Joined: Jan 2014
Posts: 2,478
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From: Downers Grove Illinois