A forum for owners of Yamaha TTR250 trail and enduro bikes!

ttr steve · Super Guru

Battery drain when bike not in use

mossproof · Super Guru

Thread so nice he posted it twice

Plug looks reasonable to me Steve. Not a lot of soot there.
If you have an ammeter function on a multimeter, disconnect one terminal of the battery, put the meter in line and measure the drain, then unplug/remove various components 'till the current drops to 0. You can also do this by putting a bulb in place of the meter. Any current flow will light the bulb, but if it is a tiny drain, the bulb might not glow enough to see.
Of course having a shelf full of spare parts makes your's the easy option

TTRfan · Super Guru

I had battery drain issues on a digital speedo TTR that turned out to be the speedo head drawing power even when the ignition was switched off. I took the easy way out and just added a switch.

It'll be interesting to see if the change of rec/reg fixes it wink In other words, don't chuck the old one quite yet!

JOHNYBOY · Super Guru

put the old one on as simon said do a test by unplugging everthing thats what i do if a very low drain you need mili amps

ttr steve · Super Guru

mossproof wrote:
Thread so nice he posted it twice
Plug looks reasonable to me Steve. Not a lot of soot there.
If you have an ammeter function on a multimeter, disconnect one terminal of the battery, put the meter in line and measure the drain, then unplug/remove various components 'till the current drops to 0. You can also do this by putting a bulb in place of the meter. Any current flow will light the bulb, but if it is a tiny drain, the bulb might not glow enough to see.
Of course having a shelf full of spare parts makes your's the easy option

Good advice will try it smile would be interesting to see if it is the regulator

comeragh · Senior Member

Go shopping on it a bit more.One of the greatest things about having a kicker when inevitably the electrics go funny .The multimeter idea is spot on .Mine has the same problem for a while now but I just can't be bothered to fix it .Let me know if you find the culprit Steve .

ttr steve · Super Guru

Hi Gary

Need to give you a call, hoping me and Mark will get to see you next year!

Still haven't had the time to check Simon's tip cry or ride me flipping bike

ttr steve · Super Guru

Went to have a quick spin on the bike today and flat battery furious furious furious so not a faulty regulator, will need to follow Simons advice, hope he don't say told you so

ttr steve · Super Guru

tested for parasitic drain, nothing reads on my meter, any suggestions?

JOHNYBOY · Super Guru

remove one lead for when bike is stood put back on battery when you want to use it see if it starts if so faulty battery it might be new or a few months old still could be faulty

comeragh · Senior Member

Steve do you have heated grips .Wire on mine was cut so I removed fuse and bike is now not draining battery.

ttr steve · Super Guru

Yes I do, but have a switch to turn them off and the USB, just bought a battery monitor that has an app for my phone, trying it out 12.78v and 85% charged tonight, will try in the morning,. It will also show charging voltage when I start the bike

One of these

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-- Edited by ttr steve on Wednesday 2nd of December 2020 06:40:42 PM

JOHNYBOY · Super Guru

but did you do as i said uncouple the lead to test the battery

ttr steve · Super Guru

Yep and it was fine

ttr steve · Super Guru

Exactly the same this morning, got to be the Stator, as I am only doing short rides, not noticed it going flat. Will start and check running voltage later.

JOHNYBOY · Super Guru

uncouple the battery see if it drops voltage

ttr steve · Super Guru

Nope it doesn't John

Not the stator either, as I charged the battery whilst I stripped the starter motor apart, put it all back together again and it started, (as I thought it may be a load problem) Checked running voltage 14.7, so that was fine. Will see what tomorrow brings.

JOHNYBOY · Super Guru

some component must be draining the battery or a leak to earth if you have uncoupled the battery for a few days & its ok

Herman · Veteran Member

Could actually be the battery even though it is new, unless of course the problem surfaced with the old one. It only takes one cell to be duff, a bit of a lay up and cold weather, bit like me really.

ttr steve · Super Guru

Yep the battery was duff and returned for a replacement.

Phew went through everything to get that sorted