Best Answer dklawson , 26 June 2015 - 11:17 PM
The wiring diagram will not load for me. However, the tach you have should use the common aftermarket wiring scheme of green to coil (-), black to earth, red to switched 12V.
The green sense wire is looking for voltage swings between 12V and 0V. Hooked to coil (+), the tach will see no voltage change on cars with a standard ignition and swings between 0V and 6V on ballast ignitions. Move your green wire to coil (-) and see if the tach doesn't begin working properly.
Go to the full post
Speeding Along Now
Posted 26 June 2015 - 08:02 PM
Hi,
My rev counter never worked, but I noticed recently that the black wire was disconnected. Earth perhaps? So I attached it to earth but still didn't work with the car running. I noticed as I turned the ignition off, that the counter bounced up to revs for a moment.
Do I have a wire crossed somewhere that would cause that behavior?
thanks!
Moved Into The Garage
Posted 26 June 2015 - 08:28 PM
Is this a factory tachometer or an aftermarket gauge?
The gauge problem could be an intermittent connection or something that is wired wrong. Once we know which type of tach you have we can provide more assistance.
Speeding Along Now
Posted 26 June 2015 - 09:19 PM
It's an aftermarket "pro tach", looks just like that, minus the red marker...
http://www.fordf150....icles/tach2.jpg
http://www.theranger...tach_wiring.JPG
Light works, and AFAIK, it all looks to be hooked up the way it says.... Green goes to my coil + side...
Edited by crackfoo, 26 June 2015 - 09:20 PM.
Moved Into The Garage
Posted 26 June 2015 - 11:17 PM Best Answer
The wiring diagram will not load for me. However, the tach you have should use the common aftermarket wiring scheme of green to coil (-), black to earth, red to switched 12V.
The green sense wire is looking for voltage swings between 12V and 0V. Hooked to coil (+), the tach will see no voltage change on cars with a standard ignition and swings between 0V and 6V on ballast ignitions. Move your green wire to coil (-) and see if the tach doesn't begin working properly.
Speeding Along Now
Posted 27 June 2015 - 01:25 AM
Speeding Along Now
Posted 27 June 2015 - 01:45 PM
That did the trick!
Thanks.
Now I s'pose when I get around to switching to electric ignition, this won't work anymore eh?
Moved Into The Garage
Posted 27 June 2015 - 02:04 PM
Now I s'pose when I get around to switching to electric ignition, this won't work anymore eh?
Not at all. Your tach is of a modern design and measures/counts voltage pulses. If you stick with a traditional, distributor based electronic ignition your new tach should work fine. If you change to something like a MegaJolt or other mapped ignition system, the function of the tach will be determined by what form of tach output the system has.
I'm glad you got it working. Enjoy your new gauge.
0 members, 1 guests, 0 anonymous users
