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  #1  
Old 02-14-2014
Tim876 Tim876 is offline
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Default tachometer inop

My tachometer stopped working on my last trip out '78 FC with 3208. Worked great up until then (it was REALLY cold out). Thoughts? Searched archives and didn't find any direct answers. Thanks as usual for any and all help!
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Tim Kelly
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1978 FC35SB
1969 Trojan SeaVoyager
1955 BMW R50
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Old 02-14-2014
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NH Bill NH Bill is offline
1983 FC 35 "Casa Billisa"
 
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Quote:
Originally Posted by Tim876 View Post
My tachometer stopped working on my last trip out '78 FC with 3208. Worked great up until then (it was REALLY cold out). Thoughts? Searched archives and didn't find any direct answers. Thanks as usual for any and all help!
This could be a lot of things...Mechanical linkage, electrical (ground), the gauge itself, sender, right angle drive. It's been discussed a lot on this Forum.

Your 78 is probably set up like other FCs until about 1986.

Type in a google search at the search window at the top of the home page

" tachometer FC"

You'll have a lot of reading there.


NH bill
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Old 05-28-2014
Tim876 Tim876 is offline
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So after a little more attention I am realizing that the gauge occasionally "jumps" with no real relevance as to the actual rpm. It has made swings completely through the range and my volt gauge seems to do strange things momentarily when the tach gauge is jumping (most of the time it just sits at dead). As mentioned before, it used to work perfectly.

This leads me to believe that it might be a ground issue as NH Bill mentioned...where is this ground? Off the back of the gauge? Haven't pulled it apart yet.
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1978 FC35SB
1969 Trojan SeaVoyager
1955 BMW R50
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Old 05-28-2014
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Mustang88 Mustang88 is offline
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Tim,

The ground is right on the back of the guage joined with most of the other guages (I believe). Probabably, a rats nest of wires - mine is (was). My guage was working properly, until recently - now it reads 600 RPM low. I will try and get some pictures of behind the panel for you in next day or so.

I hope yours is just the ground wire!
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Old 05-28-2014
Tim876 Tim876 is offline
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Thanks Kevin...I will pull the gauge panel and see what is going on in there.
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1978 FC35SB
1969 Trojan SeaVoyager
1955 BMW R50
Old Ford Trucks!
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