Battery Tender....

brandonB1 · Jan 16, 2012

I plugged my '09 570 into a battery tender for the first time a few minutes ago. It was a Battery Tender Junior. About 30 seconds after I plugged it in, the lights came on and it sounded like the fuel pump cycled. Then everything turned off in about 2 or 3 seconds. It does this about every 30 seconds while plugged into the tender...?

My questions is: Is this normal? Has anyone else had the same, or different thing happen?

Thanks for the help!

Brandon

ned37 · Jan 16, 2012

yes. do a search

Ruger · Jan 16, 2012

My 2011 FE570S doesn't behave like that on the very same type of charger.

ninayu61 · Jan 16, 2012

Brandon,

The EFI system is triggered by a change in voltage (engine starting or running). The EFI system runs the fuel pump to establish pressure (that is the sound you are hearing).

To charge the battery you need to isolate the voltage change. You can:
1. remove the battery to charge (pain)
2. remove the lower fuse above the negative battery terminal (not too bad)
3. disconnect the wire connector between the two fuses above the negative terminal (easy)

Good luck,
Todd

PS, consider the lithium battery and never charge again

Electrified · Jan 16, 2012

My 2011 570S is always on a Sears battery maintainer. I have not had any issues whatsoever. My bike is 4 months old but by habit, I keep everything I own on a battery maintainer and seldom have to replace batteries.

Sheeter · Jan 19, 2012

The same thing just happened to me this weekend on my 2011 FE390. Called the dealer and he told me that it occurs when the batter is fully charged. I've used the tender in the past without this issue. Not sure why it's happpening.

pegscraper · Jan 19, 2012

ninayu61 said:
Brandon,

The EFI system is triggered by a change in voltage (engine starting or running). The EFI system runs the fuel pump to establish pressure (that is the sound you are hearing).

To charge the battery you need to isolate the voltage change. You can:
1. remove the battery to charge (pain)
2. remove the lower fuse above the negative battery terminal (not too bad)
3. disconnect the wire connector between the two fuses above the negative terminal (easy)

Good luck,
Todd

PS, consider the lithium battery and never charge again

I have never had this happen on my '10 570.
The EFI is not triggered by a change in voltage. It is triggered when the power relay operates and supplies power to fuse 1. The ECU then energises the ignition circuit and cycles the fuel pump. If the engine is not started the power relay switches off after a few seconds and everything is dead once again.The only way the power relay can operate is by output from the alternator, ie., when the engine is turned over. Even a quick stab on the starter button is enough for the relay to kick in. Looking at the diagram no amount of battery charging should operate the power relay but I'm thinking, somehow, when the battery voltage goes high enough is it feeding back through the reg/rectifier and doing just that...............on some bikes?

brandonB1 · Jan 19, 2012

Thanks everyone!

I did finally wade through "search" purgatory and found a previous topic.... Sounds like some minor disconnecting or fuse pulling is the way to go.

I appreciate all the help.

Thanks.

ninayu61 · Jan 21, 2012

brandonB1 said:
Sounds like some minor disconnecting or fuse pulling is the way to go.

Glad to help, I am still looking into the LI batteries for doubling my CCA and never needing a battery tender. Just waiting for my current battery to die and will replace with the LI.

Todd

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Battery Tender....

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Electrified

Sheeter

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