Tach Board & Filter
Thread Starter
Intermediate
Joined: Oct 2010
Posts: 42
Likes: 0
From: Blind Bay British Columbia
Tach Board & Filter
Hey Guys...I replaced my burned out tach circuit boardand filter. Nice to have the tach working. At first the tach worked when
I started her up, then within a minute or two, it quit. I thought GREAT!!!
I fried my new board. I checked connections.....everything was OK.
Started the car... no tach movement. I then by-passed the filter, and the tach worked. I tried several other things, but it boiled down to the tach filter again. I took the filter right out, and the tach has worked ever since. What do you guys think? Deny.
Le Mans Master
Joined: Sep 2002
Posts: 5,236
Likes: 898
From: Myrtle Beach SC
Of course, you could have a bad, new tach filter. Try another filter or your old one and see what happens.
Former Vendor
Joined: Aug 2006
Posts: 76,656
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From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Hey Guys...I replaced my burned out tach circuit boardand filter. Nice to have the tach working. At first the tach worked when
I started her up, then within a minute or two, it quit. I thought GREAT!!!
I fried my new board. I checked connections.....everything was OK.
Started the car... no tach movement. I then by-passed the filter, and the tach worked. I tried several other things, but it boiled down to the tach filter again. I took the filter right out, and the tach has worked ever since. What do you guys think? Deny.
1) The first tach filter was not good.
2) The first tach board was cooked.
3) another filter bad.
I'm not saying that is the case... but it surely would be something to check out.
Original boards and filters go bad all the time, so it may just be a case of a defective filter too... but well worth keeping an eye on.
Willcox
Thread Starter
Intermediate
Joined: Oct 2010
Posts: 42
Likes: 0
From: Blind Bay British Columbia
Faulty Filter
Hi , The tach has been working great without a 
filter for days. I am running a new Mallory HEI Distributer as well. Must be a bad filter. The tach is reading smooth and steady. I will go filterless for now. Thanks for the input, Deny.
filter for days. I am running a new Mallory HEI Distributer as well. Must be a bad filter. The tach is reading smooth and steady. I will go filterless for now. Thanks for the input, Deny.
