Author Topic: Rostra cruise issue  (Read 468 times)

Offline seismo

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Rostra cruise issue
« on: November 11, 2020, 09:55:57 pm »
This is driving me nuts.  I installed a Rostra cruise control on my 2009 C-14 following the wiring diagram made by Fred Harmon and available on the Concours Owners Group forum.  I have the Rostra 250-3592 panel-mount switch, with Engaged light.  I installed relays for the Engaged light and for the negative brake sense line.  The unit works, but....    If I leave the unit turned on, it stays on when I start the bike, but will not engage until I turn the unit off and then back on.  This isn't a big deal, but....    When I first engage the unit, it will disengage with the brake, but it won't re-engage unless I turn the unit off and then back on.  This situation lasts for a few minutes, and then the problem disappears and everything works.  I have duplicated this behavior three times.  I have checked the functionality of the control switch following the instructions in the manual, and all of the voltages on the servo side of the 4-pin connector check out.  I cannot get the unit to go into Diagnostic Mode; the LED light remains lit.  I've read that the NSS wire needs to be disconnected for the Diagnostic Mode to work, but I haven't tried that yet because I'd have to cut a wire.   My main ground and brake-sense grounds are solid.  All of my wire taps and splices are hard-wired solder joints covered by electrical tape or heat-shring tubing.  Any suggestions would be greatly appreciated.

Offline connie_rider

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Re: Rostra cruise issue
« Reply #1 on: November 12, 2020, 07:14:41 am »
That's a question that is waaaay above my pay grade.
Being an electrical idiot (and proud of it) I can only guess that it might be a relay that is sticking?
I suggest you contact Fred.

Ride safe, Ted

Offline BruceR

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Re: Rostra cruise issue
« Reply #2 on: November 12, 2020, 09:04:51 am »
Brian Felice would be a good resource as well.  Search BDF on this forum.  Same user name on Concours.org.

Offline maxtog

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Re: Rostra cruise issue
« Reply #3 on: November 12, 2020, 03:24:11 pm »
Yep, Brian will surely respond once he sees the thread.
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Offline seismo

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Re: Rostra cruise issue
« Reply #4 on: November 12, 2020, 05:17:38 pm »
That's a question that is waaaay above my pay grade.
Being an electrical idiot (and proud of it) I can only guess that it might be a relay that is sticking?
I suggest you contact Fred.

Ride safe, Ted
Thanks.  I thought about that myself, and will try swapping out the relay.

Offline seismo

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Re: Rostra cruise issue
« Reply #5 on: November 12, 2020, 05:18:42 pm »
Brian Felice would be a good resource as well.  Search BDF on this forum.  Same user name on Concours.org.
I was hoping he'd see my post and respond.  If he doesn't, I'll send him a PM.

Online B.D.F.

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Re: Rostra cruise issue
« Reply #6 on: November 14, 2020, 02:33:51 pm »
I do not have Fred's schematic but I may be able to help anyway. Shoot me an e-mail, my address is under my avatar, top left of the screen. Be sure to use e-mail as I may not see a PM.


I was hoping he'd see my post and respond.  If he doesn't, I'll send him a PM.
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