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  1. #1
    Senior Member RipGroove's Avatar
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    How to find a battery drain?

    I'm pretty sure ever since I fitted a Puig tail tidy, genuine Yamaha LED flashers and an eBay flasher relay something is is slowly draining my battery. If I don't use the bike for a week or two it really struggles to start if at all. Currently it's constantly plugged in to a battery tender but I need to get to the bottom of it.

    I'm a bit of a noob when it comes to electrics, I'm pretty sure I installed the tail tidy and indicators correctly though as they are pretty much plug and play. But when it comes to electric fault finding I'm useless.

    Here's what my battery currently looks like with the key out of the ignition, do I even have the meter on the right setting? I think I have it set to DC 50v and that its reading about 11v?




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    Last edited by RipGroove; 04-17-2016 at 08:48 AM.
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  2. #2
    Member stumpy66's Avatar
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    can you not unplug one item at a time, my first bet would be the relay, could be sticking?

  3. #3
    Senior Member RipGroove's Avatar
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    How to find a battery drain?

    Quote Originally Posted by stumpy66 View Post
    can you not unplug one item at a time, my first bet would be the relay, could be sticking?
    Yeah could be, not sure how to test it though TBH? Pretty sure I need to connect the multimeter in between the negative terminal on the battery and the bikes negative lead in order to measure the bikes drain but what setting should the multimeter be on?

    Assuming I can set the multimeter correctly to read the drain, could I then just unplug the relay and see if the reading goes down to confirm if it is actually that? And if not then I'll unplug the indicators and see what happens.
    | 2014 Matte Grey MT-09 | Ti Akrapovic | Ohlins 46DR Rear Shock | Andreani Fork Cartridges | Woolich Racing ECU Flash | G2 Throttle Tube | DNA Air Filter | Yamaha LED Indicators | Yamaha Fly Screen | Puig Tail Tidy | Michelin PR4's |

  4. #4
    Senior Member RipGroove's Avatar
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    How to find a battery drain?

    Got my digital one out, battery measures 12.7v with the ignition off.

    Not sure if I'm doing this next bit right but with the multimeter in series between the negative terminal on the battery and the bikes negative lead it reads 12.3v (does that mean my bike is constantly draining 12.3v?)

    And it does not change when I unplug the flasher relay, tail tidy and the indicators. And those are the only electrical mods I've done to the bike.


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    Last edited by RipGroove; 04-17-2016 at 09:07 AM.
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  5. #5
    Senior Member RipGroove's Avatar
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    How to find a battery drain?

    OK it seems I need to have the multimeter set to Amps in order to check for a battery drain. So I've done this (with my digital meter, not the meter above in the photos as I don't think that one does Amps) and connected it in series between the bike and the negative battery terminal. And got a reading of zero, I then switched the multimeter down to 200mA and still got a reading of zero so surely this means there is no drain? I'm a bit dubious of a reading of zero as surely there should be some small drain for the dash memory?

    So with that in mind I've taken a Volt reading across the terminals of the battery and written it down (12.66v) and I'll check it again every day for a week (without the bike being ridden or charged and without switching anything on to see if I am actually loosing power over time.


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    Last edited by RipGroove; 04-17-2016 at 10:09 AM.
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  6. #6
    Member stumpy66's Avatar
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    That sounds like a plan, might sound daft but is the battery itself ok, even if its a new one could be dodgy?

  7. #7
    Senior Member RipGroove's Avatar
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    Quote Originally Posted by stumpy66 View Post
    That sounds like a plan, might sound daft but is the battery itself ok, even if its a new one could be dodgy?
    TBH I don't know.
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  8. #8
    Super Moderator Triple Trouble's Avatar
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    Sometimes the cca's drop but the bike will start ok when it's warm??? Just a thought.


  9. #9
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    hiya , you are doing the right thing putting the meter between the neg term and the battery, i work on cars and a12 volt system is a 12 volt system. A good reading would be 0.07 amp or less ( 7 hundreath of 1 amp) even better get an amp clamp, then it saves you disconneting the negative lead. Hope this helps

  10. #10
    Senior Member RipGroove's Avatar
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    How to find a battery drain?

    I've been testing and when my multimeter is set to 200mA on the dial it reads 00.4 when connected in series between the negative terminal and the bikes negative wire which I'm guessing is 4mA (as I noticed when going from 20A to 200mA on the dial the decimal point moved so it's now reading milliamps and not Amps).

    So if that's the case then 4mA is an acceptable amount to be drawn from the battery with the ignition off. This small amount is probably to keep the dash memory alive.

    Also with the meter still in series between the negative terminal and the negative wire (still reading 00.4) I systematically unplugged everything I've added to the bike (tail tidy, indicators, indicator relay and USB port) and the reading on the meter stayed the same.

    So taking all that in to account and assuming I'm reading the meter right (4mA) it looks like I don't have a battery drain at all, so now I'm thinking the battery is fucked. So it's currently on a trickle charger ready for when my battery drop tester should arrive (tomorrow I think) so I can see if the battery is actually any good. I'm told the drop tester has a big old resistor in that simulates the battery being under load which will then tell me what I need to know.

    I did a crude load test with my multimeter this morning:

    Battery read 12.64v to start with so I started bike with meter across terminals and the voltage dropped to 9.46v (I'm told anything under 9.5v and the battery is shagged), so I went to do the same test with my second analogue meter just to compare and the bike wouldn't start, not enough juice in the battery.

    So I'm hoping it's just the battery that's fucked as I'm also told that a fucked starter motor can give the same symptoms as a weak battery.




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    | 2014 Matte Grey MT-09 | Ti Akrapovic | Ohlins 46DR Rear Shock | Andreani Fork Cartridges | Woolich Racing ECU Flash | G2 Throttle Tube | DNA Air Filter | Yamaha LED Indicators | Yamaha Fly Screen | Puig Tail Tidy | Michelin PR4's |

 

 

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