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Thread: Fan killing battery, it's still on even with engine off.

  1. #31
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    Default Re: Fan killing battery, it's still on even with engine off.

    I didn't read each and every post, but I reduced the thermostat temperature. I let the fan start cooling at 180F. A lot less heat to remove than 205F and less cooling after the engine has stopped. You paid for it, you might as well get the most from it. Never heard of a fan wearing out, yet.

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  3. #32
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    Default Re: Fan killing battery, it's still on even with engine off.

    Quote Originally Posted by ndrorder View Post
    I didn't read each and every post, but I reduced the thermostat temperature. I let the fan start cooling at 180F. A lot less heat to remove than 205F and less cooling after the engine has stopped. You paid for it, you might as well get the most from it. Never heard of a fan wearing out, yet.
    That is a good idea, once I do the reg/rec mod and know that the fan won't power from the battery.
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  4. #33
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    Default Re: Fan killing battery, it's still on even with engine off.

    Quote Originally Posted by guijs View Post
    That is a good idea, once I do the reg/rec mod and know that the fan won't power from the battery.
    the R/R mod with relay I mentioned you still are running off the battery difference is fan only on with bike running. If you are going to run off the engine while running you don't need a relay but at low engine speed the fan may move very slowly.
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  5. #34
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    Default Re: Fan killing battery, it's still on even with engine off.

    Quote Originally Posted by dirtbikeace View Post
    the R/R mod with relay I mentioned you still are running off the battery difference is fan only on with bike running. If you are going to run off the engine while running you don't need a relay but at low engine speed the fan may move very slowly.
    He's going to run the R/R off the solid yellow, AC wire. That has nothing to do with the battery charging/connection side of the stator on his bike, so he will be isolated from it.
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  6. #35
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    Default Re: Fan killing battery, it's still on even with engine off.

    Quote Originally Posted by jeb View Post
    He's going to run the R/R off the solid yellow, AC wire. That has nothing to do with the battery charging/connection side of the stator on his bike, so he will be isolated from it.
    Like I said my fix so the fan would not be on with bike off was to run a relay with the yellow wire being used after the R/R to trigger the relay so the battery is engaged to run the fan, just wanted him to know that. and running a fan off the stator may result in slow working fan at slow engine speed, I know I can't see my lights at idle but need to rev up to 4k for them to be usable.
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  7. #36
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    Default Re: Fan killing battery, it's still on even with engine off.

    Quote Originally Posted by ndrorder View Post
    I didn't read each and every post, but I reduced the thermostat temperature. I let the fan start cooling at 180F. A lot less heat to remove than 205F and less cooling after the engine has stopped. You paid for it, you might as well get the most from it. Never heard of a fan wearing out, yet.
    Quote Originally Posted by guijs View Post
    That is a good idea, once I do the reg/rec mod and know that the fan won't power from the battery.
    I on the other hand do not think it is a good idea. With the thermo-sensor set at 180 F the fan will likely be running nonstop under slower conditions.
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  8. #37
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    Default Re: Fan killing battery, it's still on even with engine off.

    I did the mod and it worked perfectly. Wired the AC-DC reg/rec on the yellow and brown wire from the stock regulator and I got 12.07v DC on idle, without significant change on higher RPM. I think the fan is not running slower. Well, it should not if the voltage is 12v+.

    I set the fan temp to 85C, lets see how it goes.
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  9. #38
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    Default Re: Fan killing battery, it's still on even with engine off.

    Quote Originally Posted by dirtbikeace View Post
    Like I said my fix so the fan would not be on with bike off was to run a relay with the yellow wire being used after the R/R to trigger the relay so the battery is engaged to run the fan, just wanted him to know that.
    Gotcha'. But the same will happen by running a new rectifier on the yellow wire as far as the fan only running when the bike is running, except it will never be able to run the battery down.

    and running a fan off the stator may result in slow working fan at slow engine speed, I know I can't see my lights at idle but need to rev up to 4k for them to be usable.
    Yeah, that's true at low RPM riding.
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  10. #39
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    Default Re: Fan killing battery, it's still on even with engine off.

    If you can find a power source that shuts off when the motor is off you can use it to trigger a relay that controls the power to the fan. Check and see if there is a plug for a head light or something like that.

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