Tachometer Wiring Question
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Joined: May 2019
Posts: 72
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From: Houston
BTT
spot on. after scouring over the schematics I ended up tying the 2 signal wires at the coil together and sure enough it worked. With one siginal wire tach 1/2 what it needed to be. It seem i wouuld seem i turned the igntion into dual fire (or single). it seems everyone has a different definition. Wether its wasted spark or not etc etc. Guessing coil dwell time isnt impacted as 1 and 2 are now fireing at exactly opposite of each other. Someone please correct me if im wrong w/ reference material if possible.
for siginal : tied grey/blue And blue/red At back of coil together and ran to Tach Green wire
for 12v switched: i tied tach red and tach yellow toghter then tapped into the red/black wire at the ign switch. Got swiched 12v for lights and tach power
Ran the bike at idle. 1100 RPMS. Ran to rev limiter approx 5k-5.2k.
Ground- pretty much any where there is a non painted screw. Meter it first.
Thats pretty much it. The unicorn of that tach harness is NOT there. As mentioned
Thoughts
spot on. after scouring over the schematics I ended up tying the 2 signal wires at the coil together and sure enough it worked. With one siginal wire tach 1/2 what it needed to be. It seem i wouuld seem i turned the igntion into dual fire (or single). it seems everyone has a different definition. Wether its wasted spark or not etc etc. Guessing coil dwell time isnt impacted as 1 and 2 are now fireing at exactly opposite of each other. Someone please correct me if im wrong w/ reference material if possible.
for siginal : tied grey/blue And blue/red At back of coil together and ran to Tach Green wire
for 12v switched: i tied tach red and tach yellow toghter then tapped into the red/black wire at the ign switch. Got swiched 12v for lights and tach power
Ran the bike at idle. 1100 RPMS. Ran to rev limiter approx 5k-5.2k.
Ground- pretty much any where there is a non painted screw. Meter it first.
Thats pretty much it. The unicorn of that tach harness is NOT there. As mentioned
Thoughts
Last edited by dysfunction1; Jun 5, 2019 at 08:15 AM.
Grand HDF Member
Joined: Jun 2013
Posts: 4,998
Likes: 878
From: Iowa
BTT
spot on. after scouring over the schematics I ended up tying the 2 signal wires at the coil together and sure enough it worked. With one siginal wire tach 1/2 what it needed to be. It seem i wouuld seem i turned the igntion into dual fire (or single). it seems everyone has a different definition. Wether its wasted spark or not etc etc. Guessing coil dwell time isnt impacted as 1 and 2 are now fireing at exactly opposite of each other. Someone please correct me if im wrong w/ reference material if possible.
for siginal : tied grey/blue And blue/red At back of coil together and ran to Tach Green wire
for 12v switched: i tied tach red and tach yellow toghter then tapped into the red/black wire at the ign switch. Got swiched 12v for lights and tach power
Ran the bike at idle. 1100 RPMS. Ran to rev limiter approx 5k-5.2k.
Ground- pretty much any where there is a non painted screw. Meter it first.
Thats pretty much it. The unicorn of that tach harness is NOT there. As mentioned
Thoughts
spot on. after scouring over the schematics I ended up tying the 2 signal wires at the coil together and sure enough it worked. With one siginal wire tach 1/2 what it needed to be. It seem i wouuld seem i turned the igntion into dual fire (or single). it seems everyone has a different definition. Wether its wasted spark or not etc etc. Guessing coil dwell time isnt impacted as 1 and 2 are now fireing at exactly opposite of each other. Someone please correct me if im wrong w/ reference material if possible.
for siginal : tied grey/blue And blue/red At back of coil together and ran to Tach Green wire
for 12v switched: i tied tach red and tach yellow toghter then tapped into the red/black wire at the ign switch. Got swiched 12v for lights and tach power
Ran the bike at idle. 1100 RPMS. Ran to rev limiter approx 5k-5.2k.
Ground- pretty much any where there is a non painted screw. Meter it first.
Thats pretty much it. The unicorn of that tach harness is NOT there. As mentioned
Thoughts
Road Captain
Joined: Jun 2007
Posts: 632
Likes: 86
https://www.hdforums.com/forum/touri...s-harleys.html
https://www.hdforums.com/forum/dyna-...er-signal.html
I may have already posted these links to old posts of mine. Not sure it helps here but it may help someone else down the road.
By the way, my FXDC Speedhut tach set-up is still going strong.
.
https://www.hdforums.com/forum/dyna-...er-signal.html
I may have already posted these links to old posts of mine. Not sure it helps here but it may help someone else down the road.
By the way, my FXDC Speedhut tach set-up is still going strong.
.
Last edited by leafman60; Jun 6, 2019 at 06:53 AM.
HDF Community Team
Joined: Aug 2018
Posts: 3,089
Likes: 1,252
From: New Hampsha
I gotta think there's a good reason why there are two wires in the first place. I don't think I would have the guts to just tie them together, and I taught aircraft electrical courses up until retirement. But, then, it ain't an aircraft...
Isn't there a way to tell the tach it's a single cylinder?
Isn't there a way to tell the tach it's a single cylinder?
Last edited by John CC; Jun 6, 2019 at 06:59 AM.
Road Captain
Joined: Jun 2007
Posts: 632
Likes: 86
I gotta think there's a good reason why there are two wires in the first place. I don't think I would have the guts to just tie them together, and I taught aircraft electrical courses up until retirement. But, then, it ain't an aircraft...
Isn't there a way to tell the tach it's a single cylinder?
Isn't there a way to tell the tach it's a single cylinder?
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Joined: May 2019
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From: Houston
Help me on this. What would two diodes in line do for me/bike. Wishing tach saw 2 sinals but tach only read each once
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From: Iowa
They would prevent the signals from being seen on the opposing senders. Anodes toward the coil and cathodes on the line going to the tach. The tach will still see only one signal but it isn't a good idea to push an output to another output by tying them directly together.
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Joined: May 2019
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From: Houston
Diodes
Ok perfect. So I currently am running 2 individual wires under tank up under console to terminate. What dieods 1 or 2 diodes to each signal wire before I tie both to green tach wire?
What exactly would? Prevent othe signal wire from seeing each other? There fore is back to OEM single fire?
Thanks for help know minimal electric
What exactly would? Prevent othe signal wire from seeing each other? There fore is back to OEM single fire?
Thanks for help know minimal electric
Grand HDF Member
Joined: Jun 2013
Posts: 4,998
Likes: 878
From: Iowa
Ok perfect. So I currently am running 2 individual wires under tank up under console to terminate. What dieods 1 or 2 diodes to each signal wire before I tie both to green tach wire?
What exactly would? Prevent othe signal wire from seeing each other? There fore is back to OEM single fire?
Thanks for help know minimal electric
What exactly would? Prevent othe signal wire from seeing each other? There fore is back to OEM single fire?
Thanks for help know minimal electric
Here is a diode that should work for you. https://www.mouser.com/ProductDetail...JnSZSuW1xB0%3D
Solder a diode lead that is opposite the eyelets (opposite the stripe on the black body) one to each lead from the coil and heat shrink up to the eyelets. Solder the eyelets together and solder to the wire or post on the tach.