back to my tach delema
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Cruiser
Joined: Jun 2007
Posts: 208
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From: Az
back to my tach delema
I posted not too long ago about adding a handlebar tach to my 2007 Low Rider. The first tach had too many wires, so, I got another one with 4 wires. The instructions for the colored wires are:
Green to neg term of coil or CDI..of course on my bike there is no neg wire on the coil
Black to ground
Blue to lamp on..this one I tapped into the original tach harness using the O/W accessory wire
Red to ignition on...this one I tapped into " " " using the O ignition wire.
The above green wire is the wire that needs the tach signal. The only wire avail on the original tach harness is the LGN/V datalink wire. Turned the ign on..lites on the tach came on. Then started her up while touching the Green tach wire to the LGN/V wire. The needle moved between 1K and 2 K on the tach. It wasn't steady. As I reved her up a bit, the needle did not move above 2K; kept on moving between 1K and 2K.
I had a handlebar tach for 2 yrs hooked up as above (I think) and it worked fine before it went bad.
ANY IDEAS out there? I do had the schematics for my bike.
Thanks
Green to neg term of coil or CDI..of course on my bike there is no neg wire on the coil
Black to ground
Blue to lamp on..this one I tapped into the original tach harness using the O/W accessory wire
Red to ignition on...this one I tapped into " " " using the O ignition wire.
The above green wire is the wire that needs the tach signal. The only wire avail on the original tach harness is the LGN/V datalink wire. Turned the ign on..lites on the tach came on. Then started her up while touching the Green tach wire to the LGN/V wire. The needle moved between 1K and 2 K on the tach. It wasn't steady. As I reved her up a bit, the needle did not move above 2K; kept on moving between 1K and 2K.
I had a handlebar tach for 2 yrs hooked up as above (I think) and it worked fine before it went bad.
ANY IDEAS out there? I do had the schematics for my bike.
Thanks
Thread Starter
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Cruiser
Joined: Jun 2007
Posts: 208
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From: Az
Actually, I did google dilemma, and it didn't come up with the correct spelling. Anyways, to make a long story short, the data link wire lgn/v gave a signal but it made the tach needle 'pulse' and didn't increase as I turned the throttle. So, I tapped into the be/o wire down by the ign coil. The tach needle was steady, even tho the reading was in 1/2. eg...idling at 500 rpm, instead of 1000. I read in a previous post, that that happened to someone else also, and they mentally multiplied by X2. That's just fine with me..bottom line is that I finally have a working tach again on my handlebars!
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Cruiser
Joined: Jun 2007
Posts: 208
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From: Az
mini tach problem revisited
So, my mini tach won't work on my 07 low rider. The tach is looking for a analog signal; from what I've read on my previous answers to my post, HD only puts out a digital sig. So....I'm just going to take it off. BUT my check engine lite stays on. The diag code is"low tach sig". I cleared it, but it comes back on. The bike originally had a tach, but I took it off, sold it and bought a mini one. I hope I'm not stuck with that annoying lite on for the rest of my life! I'm a little worried that if something goes wrong and the 'check engine' icon is supposed to light up, I won't know that something is wrong because it's on all the time. Any ideas out there
Tourer
Joined: Nov 2008
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From: BAY AREA CA USA WESTCOAST
Harley davidson bff
This is your best friend I found mine now it's your turn. This will take out all the guessing answer a lot of the questions.
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Cruiser
Joined: Jun 2007
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From: Az
got a manual....not a lot of help, I do know to read the elect schematics. Went to MMI in 74.WRKD, the original tach was off my bike 07low rider. No 'manual' with the after-market tach.Archer...I never plugged anything into the ECM. the #3 input/output was empty a plug on both sides.
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Road Warrior
Joined: May 2010
Posts: 1,718
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From: Bay area, CA
The serial data wire is not the wire you need for this tach, it was probably the one you needed for the last tach you had with too many wires. Do some searching there's been plenty of people that have made those tachs work. I believe there's an unused port on the main ecm plug that you can tap into or a pink wire you can splice into. I'm not sure but I've seen plenty of those threads here