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Where does the tach hook to |
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Geno 
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Joined: September-05-2007 Location: United States Status: Offline Points: 179 |
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 Topic: Where does the tach hook toPosted: October-23-2007 at 6:23pm |
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on a 70 separator? Pete put up a wiring diagram but I can hardly read it and it seems to be gone now. Thanks.
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Posted: October-23-2007 at 7:56pm |
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geno, Like this one?? It would be a gray wire.
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TRDon
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Joined: December-22-2006 Location: United States Status: Offline Points: 65 |
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Posted: October-24-2007 at 1:09am |
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always typical to see the tach signal derived from the ground on the coil.
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85 2001 351 240hp FS
93 sport |
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Geno
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Joined: September-05-2007 Location: United States Status: Offline Points: 179 |
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Posted: October-24-2007 at 1:07pm |
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Thanks so much!
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1969cc
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Joined: February-22-2005 Location: United States Status: Offline Points: 84 |
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Posted: October-24-2007 at 5:05pm |
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Geno
Are you hooking up a new tach or your original 1970 tach? My 1969 Mustang with my original tach hooks to the positive terminal of the coil. Fred |
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TRBenj
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Joined: June-29-2005 Location: NWCT Status: Offline Points: 21125 |
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Posted: October-24-2007 at 5:20pm |
Thats interesting. I thought all coils had +12V (or a little less if using the ballast resistor) on the + terminal. The - terminal connects to the distributor (ign module/points) and will read between 0V and 12V, depending on the position of the dist, creating a pulsed signal to drive the tach. How would a tach get a signal from the + terminal? |
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Geno
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Joined: September-05-2007 Location: United States Status: Offline Points: 179 |
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Posted: October-24-2007 at 5:22pm |
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Hooking my original tach up to see if it works. The coil is a Mallory that my stepdad put in and he may not have hooked the tach back up.
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1969cc
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Joined: February-22-2005 Location: United States Status: Offline Points: 84 |
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Posted: October-24-2007 at 5:38pm |
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TR
My original tach has a yellow send wire. When I hook up my o'scope on the + terminal of the coil the pulse is present. I recently tried to hookup a newer style tach with a gray send wire to the + on the coil and it did not work. I had to hook it up to the - terminal of the coil to get it to work. Fred |
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TRBenj
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Posted: October-24-2007 at 5:48pm |
Interesting! I wonder how the old tach pulls the signal off the + side. |
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1969cc
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Posted: October-24-2007 at 6:08pm |
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TR
http://www.tachman.com/fordhkp.htm Check out the above link for Faria tachs. My hookup is similar to this. The tach is hooked up in series. Fred |
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1969cc wrote: