Baron's 2" Mini-bullet tach

[Sylvester]

I purchased the Baron's mini-bullet tach (BA-7573-00) with brake resivoir mount kit a couple weeks ago. This model has white LED backlighting only. The instructions were universal and pretty much pertained to HD intall. After e-mailing John and getting pertinant instructions (not found in the supplied paper work) I was on my way. There is a tech article here in VR on the installation, BUT there are a couple changes! The blue wire from the sigle fire ignition adaptor runs all the way to the rear coil's (either one) negative side. The black wire from the tach cannot be grounded to the coil bolt but another frame ground.

After installation, the LED back light flickered randomly and the tach needle would fluctuate randomly. There seemed no correlation between the two. I regrounded the tach wire but no improvement. My next step will be to remove the red (tach power) and yellow (LED power) tach wires from the positive terminal of the front coil and connect to a switched 12V source.

John's only other suggestion, if this failed, is to install a resistor.

Any of you weekend mechanics or better yet a seasoned mechanic have any ideas?

Within the last month I had a complete tune-up including carb sync.
:farmer:

[V7Goose]

I have no personal experience with that specific tach, but what you describe does not sound right to me.

First, no single-fire adaptor is needed on this bike - any tach that works correctly on a stock HD with dual-fire ignition will work fine on the RSV connected to one coil.

As far as a ground goes, one ground bolt is the same as another. :080402gudl_prv:
Goose

[Sylvester]

I have no personal experience with that specific tach, but what you describe does not sound right to me.

First, no single-fire adaptor is needed on this bike - any tach that works correctly on a stock HD with dual-fire ignition will work fine on the RSV connected to one coil.

As far as a ground goes, one ground bolt is the same as another. :080402gudl_prv:
Goose

So that would explain the problem. No single fire adaptor needed. I will take it out of the loop and see if that solves my problem. I guess Baron's is out of touch.
:farmer:

[Sylvester]

Thanks V7Goose, all is well now. I took the adaptor out of the system and the tach works perfect. I did ground to the coil bolt. The LED back light still does some flickering but I will live with that. If it is a problem for night riding, I will switch it so I can shut it off.

Thanks again. No telling how many e-mails with Baron it would have taken.

:farmer:

[Sleeperhawk]

Well, since this tack is supposed to be mounted to a HD, then the flickering LED is there to allow for the normal HD vibration, which the Venture does not have. :stirthepot::whistling:

[RandyR]

I have this tach but with handlebar mounts, which was installed with V7Goose's help at maintenance day. my background led does not flicker. Are you sure its connected to plain 12v dc and not a timing circuit?

[juggler]

Where are the photos?

[Sylvester]

I just completed wiring the tach and LED to a switched source. Everything appears OK except a minor amount of flicker from the LED back lighting. This deed is done on my part.

Now on to rebuilding the forks.

:farmer: