battery draw

[dragline708]

Noticed my bike would'nt start a few times once I pressed starter button .
It did after 1 or 2 more presses , I sprayed WD 40 on safe pin switch @ clutch
lever handle incase it was sticking ( which it wasn't ).
Figured it was battery getting old ( purchase nov 15 2004 ) 05 rocket III .
Replaced battery had old one tested , 13.2 volts , but only 20 % on amp
draw under load .
It idles a bit better , starts much better , and runs a bit smoother getting
full power to EDU ( with Head Light draw on & runnig lights )

With anything mechanical it could be something else
It's a place to start looking anyway.
Hope it might help , trying to figure out a starting problem

wayne

 

[greenbaron]

yea, i have been anticipating that replacement myself. i have noticed if i haven't ridden in a couple of weeks it starts just a little bit slower than if I have...
good to know, as i've had mine just 3 months longer than you. what did you replace it with, btw?

 

[W. Tripp]

Yep, a good battery makes a lot of difference.

The charging system generally provides around 13.6 volts, but if the battery is low (or old), it will be reduced trying to charge the battery.

Reduced voltage plays havoc with the ECU. The stock ECU does not compensate for reduced voltage, and as a result, the fuel injectors are not opened for the correct time, and the ignition is not providing nearly the same output - very important at start upand higher rpm. If voltage is too low, the fuel pump cannot provide the required volume for high rpm use, and the engine runs lean.

Battery voltage below 12.6 is for all intents, considered dead. Fully charged, a good battery will show 13.15v after it is charged and allowed to stabilize for 20-30 minutes. Older batteries should charge to a minimum of 13.10v. Even then, if it does not hold a load (like starting), it will not work correctly.

I have watched some guys fight tuning a bike on a dyno with a low battery. Hours of work later, and the tune is completely screwy and rich when the battery is fully charged. Unpluggng the light connectors (front and rear) can help a lot.

A good trickle charger can extend the life of a battery by several years, and can help when dyno-tuning. however, most of these devices can cost as much as a battery. If anyone is interested, I can show you how to build a very good trickle charger for little to nothing. A good cell phone charger (for an old phone), a cheap resistor, and a couple of connectors and you are in business. Even a wiring neophite can build this.

-WT

 

[dragline708]

Green baron ,
Replaced it with cross reference battery .
Mutibrand dealer ship BMW, TRIUMPH ,AND HONDA
Honda battery $ 99.99 YTX20 L -BS

good to know , incase your not by a Triumph Dealer
and a Honda Dealers just down the road a bit , and you need
a battery

Ps: you might get them cheaper somewhere else , but not
when you need it now !!
I don't like Pushing

wayne

 

[Bohica]

W. T.
Please post how to make your own trickle charger with diagram, inquiring minds want to know