battery going flat over night

COOPERSDAD · October 27, 2009, 07:24:47 PM

ok i think the rectifier is stuffed,for some reason it started getting hot again so its either that or wiring,either way i dont think its charging.is there meant to be constant power going to the RECT without the ignition on?

ducpainter · October 27, 2009, 07:40:37 PM

Quote from: COOPERSDAD on October 27, 2009, 07:24:47 PM
ok i think the rectifier is stuffed,for some reason it started getting hot again so its either that or wiring,either way i dont think its charging.is there meant to be constant power going to the RECT without the ignition on?

I don't know if it's supposed to be live with the key off, but it seems your R/R has a short to ground based on the fact it gets warm with the bike not running and the fact you can stop that by removing the ground (unbolting it from the frame). Even if it wasn't supposed to have voltage it shouldn't short to ground. Try unplugging the ignition switch and see if it changes.

R/R failures are fairly common on Ducs...I've replaced mine.

Stator failures are much less common.

COOPERSDAD · October 27, 2009, 08:12:02 PM

i was reading that trying to start the bike with a very low battery will stuff ur rectifier.plus i washed the bike plus its a duke plus its my luck ohh well i just hope buying another rect will sort it out :-) fingers crossed

Langanobob · October 28, 2009, 01:38:55 AM

Quote from: COOPERSDAD on October 27, 2009, 08:12:02 PM
i was reading that trying to start the bike with a very low battery will stuff ur rectifier.plus i washed the bike plus its a duke plus its my luck ohh well i just hope buying another rect will sort it out :-) fingers crossed

None of the above should fry anything. It's your money of course, but I'd do more testing to make sure exactly what the problem is before I started buying new parts.

COOPERSDAD · October 28, 2009, 02:08:50 AM

this is where i got the info from

anyway update is second hand rec got here just then,plugged it in and its charging as it should be,will take it for a ride 2morrow and see how we go but looks to be the go :-) i got a second hand one from metro for $150,new was $208 but wouldnt see it for a week.the one from metro is from a 748? NOTE***** DONT WASH UR DUCATI AND DONT TRY AND START IT IF THE BATT IS LOW

will let u fellas know 2morrow when the bikes back together and ive gone for a ride

seevtsaab · October 28, 2009, 12:38:36 PM

Ought to be prett easy to measure current across each fuse location - with fuses removed of course - I would think only whatever circuit the immobilizer is on should draw any current and that should be mighty low.

The meter should look like a short (fuse) when switched to measure current, methinks.

64duc · October 28, 2009, 02:10:33 PM

Make sure your meter is capable of measuring the suspected amount of amperage. Every meter I've ever had (this includes the Fluke 777 i have now) is unfused , and is only rated for 10 amps.

seevtsaab · October 29, 2009, 08:42:23 AM

Quote from: 64duc on October 28, 2009, 02:10:33 PM
Make sure your meter is capable of measuring the suspected amount of amperage. Every meter I've ever had (this includes the Fluke 777 i have now) is unfused , and is only rated for 10 amps.

I should clarify, I'm talking about finding a current draw with the bike OFF - that's seems to be the real dilema here, draining a battery overnite.
For current measurents with the bike ON I would only suggest a clamp on inductive sort but I don't believe that amount of curiosity is warranted here.

COOPERSDAD · October 29, 2009, 04:54:43 PM

ok heres the update,ive change the rectifier and the battery seems to be charging and its not getting hot and its not going flat over night so i would say that the rectifier was buggered

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battery going flat over night