Did it again..system voltage error

[800screws]

I read a lot of the posts about this but mine happens when I really get on the throttle fast and hard. The bike shuts off. Engine locks up! And I get a system voltage error. This time when i started pulling off the road I put it in neutral and the normal screen came back up and it started. Last time it didn't and the battery died. (Supposedly a new battery)
The at temp on the cluster after this happens ends up really high like in the 100's when it's 70-80 out

Is it still the rectifier? And/or relay?

[800screws]

Also this is a 08 bike

[800screws]

Is this a good replacement?
http://roadstercycle.com

[Cosworth]

That one has been used on a 1125 before.
http://www.buellxb.com/Buell-XB-Forum/Do-It-Yourself-Buell-Mods/1125r-Voltage-regulator-upgradereplacment

[Cosworth]

There is this one too, ive had really good luck with ricksmotorsport stuff on other bikes. But never used this before but its a mosfett regulator too.
http://ricksmotorsportelectrics.com/part/10-017H/MDlCdWUxMTI1Q1I=

[Sirius815]

The roadstercycle is the one that's on my 09 CR and it works great!

I will say though, I had to remove/drill out one of the factory studs so that I could mount the new VR - the holes don't line up. In addition, the PO had the wires for the VR facing forward towards the front of the bike, which is a mistake as there is very high potential for the wires to rub the seat latch release mechanism. (Mine caught fire...) I now have the wires facing towards the back.

[800screws]

Cool. Thanks guys


The regulator sounds like the problem though?

[Cosworth]

I believe there are instructions on how to test it in the service manual. I'd test it first but sounds probable.

[800screws]

The ricks one is a direct plug in. Gonna go that route if it's bad. They have it listed for a 09 1125cr. That's the same as the 08 1125r, right?

[Cosworth]

Twin cycles sells one that is similar (if not the exact same) that says it is direct plug in, and works on all models 08-10
http://www.twinmotorcycles.nl/webshop/artikel.asp?guid=YXHFSC&aid=10902&cid=0&s=regulator&a=&aname=Buell__1125_regulator_with_mosfet

[Cooter]

You may be getting the "system voltage error" just because the bike shut off.
What is the voltage reading when it dies? 12.5+ volts? Then you're ok. 9-10 volts can kill the bike when you try and throttle up and you are currently (PUN!) on the right track.

Before you start trowing expensive parts at it just guessing, I would look into why the hell the bike dies when you are riding it first!

Bad ignition wiring? Bad coil wiring? (Of course the check the grounds and battery thing everyone loves to say for every problem ever)

The AT sounds right at 100* on a 70*-80* day. It's reading from inside the air box.

[800screws]

I will. It only has done it two times and it's when I crack the throttle hard and the revs quickly accelerate. Like in 3 or 4 gear. Doing that kills the bike

[800screws]

The previous owner added a du a module with a shift light. Could it be possible that it's programmed to kill it before the rev limiter? It's not like I'm holing it open at 11k Rpms and crusing like that.

[800screws]

Dyna module

[Cooter]

A rev limiter shouldn't "kill" the bike though.
What do you mean:

This time when i started pulling off the road I put it in neutral and the normal screen came back up and it started.
The screen turned off? then back on?

It's pretty hard to get a motor to totally shut off on a high load situation like yours. Are you able to duplicate the problem every time?

Perhaps the Dyna module is losing power?

[800screws]

When it happens the bike turns off Screen stays on and says system voltage. The bike is like turning the bike on with the key before u start it. Only I'm going 100! I put it neutral. And while I'm coasting the screen clears up to its normal screen and I restart it. It's only when I rev the hell out of it.

[Cosworth]

Any idea of the voltage before or after this happens?

[800screws]

No I don't. Happened on the road

[Cooter]

That would be very important to know to diagnose it properly.


I drive with the volt/temp on the display. I wish you could set it to do that automatically instead of having to hit the toggle button.

[Cosworth]

You can cycle the 1125 display to show voltage like cooter said hit the toggle and it will show up.

I think all revisions of the cluster will. Early clusters did not have gear display does yours?

[Cooter]

Mine has a gear display, are you saying I can get it to display Volt/temp automatically? That would be sweet.

[Sirius815]

I constantly have to toggle mine to the volt display...It's always been fine, but I'm paranoid.

[800screws]

ok....I tried it in the garage....the volts on the battery were 13.87 running....after the bike was warmed up, I revved it and the first 2 times I revved it hard past 9k it turned off...no voltage error....after the first 2 times it was fine...I didn't have the display on volts....didn't realize it could display that....Ill switch it to that when its running and report back.

[Cooter]

It sure sounds like the 'voltage error" message is causes by the bike shutting off, and not an actual issue with the voltage regulator.

With it just idling, try and wiggle the wiring and connectors by the steering neck, and especially by the Dyna Module. I have no reason to suspect it per se, just that it's aftermarket and would cause it to die. I'm thinking it's more of a vibration problem, and would like to minimize the "re-testing phase". I can't say I recommend 9K rpm blasts in neutral (or on the street when it's expected to die[sad]

edit: wiggle the kill switch and tap the housing as well, maybe yanking on the bars is causing it to momentarily open or ground the circuit.

I'm trying to think of all the stuff that happens when you're really gassin' it

[Sirius815]

^^ Agreed. The circumstances don't point to a VR or stator.

[Shawns]

See if you can get specs on that dyna module. It may very well be your issue. It may have a rev limiter that for some reason is set to kill one of your ignition leads. Your best bet is to start with a clean slate and have the bike set up stock with no electrical add-ons. Not saying that it's not installed properly, but you have no idea what the PO did to your bike prior to you.

[800screws]

Yeah. Voltage on screen is 14 al the time

[Sirius815]

[up] - are all the connections tight for the battery and the associated cables? I'm sure you double checked, but I thought I'd ask.

[800screws]

Yeah. I thought that was the problem when it happened the first time

[Cosworth]

In my opinion I would detach the add on system for now, Id also test the charging system parts per the manual just to be sure and go from there.