2.8a draw on battery

[Draxsonimy]

I have disconnected a lot of things and still have a draw. When I unplug the grey connector to the ecm my draw is zero. this connector has the
SERIAL DATA TRANSMIT
SERIAL DATA RECEIVE
AIR TEMP INPUT
ENGINE TEMP INPUT
VEHICLE SPEED SENSOR
SENSOR GROUND
FAN CONTROL
KEEP ALIVE
OXYGEN SENSOR
CAMSHAFT POS SENSOR
THROTTLE POS SENSOR
5V SENSOR POWER

any of these ever seem to be suspect to a draw?

thanks for the help!

[Theycallmecrash]

Hmm, first things first your detailed process for testing the draw. 2.8amp is a lot! That a small light on kinda draw. And what lead you to test for a draw?

[Draxsonimy]

Pull + cable off battery put volt meter on 10a and put cables between battery and + cable

key off and have no add on electrical parts.

Battery dies after couple days or less now.

checked stator and VR and both were fine, new battery.

so I checked for parasitic draw. it was 1.5a now after two days of riding is 2.7a

no electrical mods except exhaust valve actuator removal and headlight high beam mod.

just been unplugging and watching the meter. no changes though

[Theycallmecrash]

Are you pulling connectors? Or fuses? You cant miss it with fuses, that will drastically reduce the possibilities. If so what fuse exactly.

[EricZ]

Since your draw exists with the key off, it could be an issue internal to the ECM. The ECM supplies the 5V sensor power to those components listed so it would be unlikely that one of them is responsible for the draw. Still, you could verify by disconnecting each of those components and checking the current draw as each one is reconnected.

[XRorXB]

Draxsonimy, as you are going through the process of elimination, you might try putting your bike in a very very quiet area and just listening. With the key off in a quiet room, you may actually be able to hear a high-pitch whine, crackling noise or other indication of high current draw.

Assuming your hearing is ok for high frequencies. Just a different approach...

[Draxsonimy]

If I pull the ecm fuse my draw drops to zero.

I have EVERY connector disconnected.

When I unplugged the engine temp sensor it went down to about 2.5a

[EricZ]

Sounds like you have an internal ground fault in your ECM. Replacing the ecm is the way to go. You could verify it by unplugging the ecm and see no current draw. You could also borrow another ecm from any Buell XB with the same engine management(DDFI-II or DDFI-III) and just plug it in with the key off to verify there is no current draw with a different ECM.

[Draxsonimy]

Been thinking about that eric... Not to many buells in my area.

[EricZ]

Darn! May be a forum member would be nice enough to lend you theirs? I'd offer you mine but I'm busy working on the electrical on my own XB and she is about to come to life.

[ReconLdr]

Pull + cable off battery put volt meter on 10a and put cables between battery and + cable

key off and have no add on electrical parts.

Battery dies after couple days or less now.

checked stator and VR and both were fine, new battery.

so I checked for parasitic draw. it was 1.5a now after two days of riding is 2.7a

no electrical mods except exhaust valve actuator removal and headlight high beam mod.

just been unplugging and watching the meter. no changes though

Parasitic load should be tested from the (-) side of the battery. I don't remember WHY it matters though.

[Draxsonimy]

Pretty sure it doesnt matter. I get same exact readings from both sides. I have always done + on cars. Service manual does say to use - but I have done both with same readings.

[ReconLdr]

Pretty sure it doesnt matter. I get same exact readings from both sides. I have always done + on cars. Service manual does say to use - but I have done both with same readings.

Ok.... I've always used the (-) cable but if you get the same reading.... guess it doesn't matter.

[Draxsonimy]

Just thought I would pull up this thread to put some closure to it.

My 2.8amp draw that had me confused for a good while ended up being a bad diode in the voltage regulator that was allowing power to goto ground.

new voltage regulator and the bike is good as new!