Author Topic: Battery draining insanely fast  (Read 2536 times)

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Offline calj737

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Re: Battery draining insanely fast
« Reply #25 on: May 04, 2016, 12:31:32 pm »
And using a meter, what voltage do you have at the battery while running and rpms at 4,000?

And what voltage do you get on Red from R/R with bike running? Then please tell me what voltage on R/R Black with motor running. Use the loose Green as your ground for the R/R tests please.
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Offline terrorshark

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Re: Battery draining insanely fast
« Reply #26 on: May 05, 2016, 03:06:36 pm »
At the battery I have 12.4 without lights. 11.9 with headlight.

Red wire. 12.4 volts
Black wire. 12.4 volts
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'72 Yamaha LS2
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Offline calj737

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Re: Battery draining insanely fast
« Reply #27 on: May 05, 2016, 03:14:48 pm »
With those reported voltages, you are charging. Your battery is showing the exact voltage as the R/R.

And the voltages listed for Red and Black are with bike running and at 4,000 RPMs?
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Offline terrorshark

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Re: Battery draining insanely fast
« Reply #28 on: May 05, 2016, 03:38:34 pm »
Yes. Bike running at 4K and higher. No change in voltage
'68 MV Agusta Tevere Motocarro
'72 Yamaha LS2
'74 MV Agusta 350b
'74 Honda CB550
'77 MV Agusta 350 Ipotesi
'00 MV Agusta F4

Offline calj737

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Re: Battery draining insanely fast
« Reply #29 on: May 05, 2016, 03:57:12 pm »
Willing to test something? If so, move the RED from the R/R directly to the battery POS terminal. The way you have it absolutely should not matter (from ymy r description) but as a point of confirmation, I'd rule out an issue with it.

And you have good, clean metal grounds for the R/R GREEN and battery ground? Pinching the motor and frame for battery ground like stock?
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Offline The Lone Builder

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Re: Battery draining insanely fast
« Reply #30 on: October 07, 2018, 04:11:50 am »
Keep control over the battery voltage level and charging with this little gadget. I installed it and have full control. I see when the charging level is too low. Driving low speed and headlight on will indicate orange. Twist the throttle over 4500 rpms and LED turns to green. I'll see when I can switch off headlight daytime and use parking light only. It blinks every 2 sec when ignition is off which look like an alarm. Battery fine as long as it blink green. Easy too see when it need to be fed during the long rest winter time.
http://www.ebay.com/itm/LED-Motorcycle-Battery-Alternator-Charge-monitor-level-indicator-warning-bike-G-/200826330214
Old photo below. Bike look better now with black pilot lamp dash board, upper tripple and drag bar

PeWe,
I'm bringing this up cos I followed the link you gave. The proce of this ting on Ebay is £1,117.99!!! That surely can't be correct?
CB750 K2 - A work in progress
CB750 K1 - The less, said the better!
CB450 K1 - It's black.
CB400F Supersport - It's rusty!

Offline Little_Phil

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Re: Battery draining insanely fast
« Reply #31 on: October 07, 2018, 07:09:32 am »
Last sales were £17.99. Dodgy keyboard?

Offline PeWe

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Battery draining insanely fast
« Reply #32 on: October 07, 2018, 10:30:08 am »
Keep control over the battery voltage level and charging with this little gadget. I installed it and have full control. I see when the charging level is too low. Driving low speed and headlight on will indicate orange. Twist the throttle over 4500 rpms and LED turns to green. I'll see when I can switch off headlight daytime and use parking light only. It blinks every 2 sec when ignition is off which look like an alarm. Battery fine as long as it blink green. Easy too see when it need to be fed during the long rest winter time.
http://www.ebay.com/itm/LED-Motorcycle-Battery-Alternator-Charge-monitor-level-indicator-warning-bike-G-/200826330214
Old photo below. Bike look better now with black pilot lamp dash board, upper tripple and drag bar

PeWe,
I'm bringing this up cos I followed the link you gave. The proce of this ting on Ebay is £1,117.99!!! That surely can't be correct?
Yes, thats a lot- It must be something wrong with that one.
I paid around £20.. Can be 17.99 + shipping as little Little_Phil seen. The seller will probably fix that when back Oct 14.
This gadget is really useful. recommended buy when price is correct again.
« Last Edit: October 08, 2018, 04:29:24 am by PeWe »
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CB750 K2-75 stock looking project started 2017

Offline The Lone Builder

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Re: Battery draining insanely fast
« Reply #33 on: October 07, 2018, 11:17:32 pm »
The same guy does have others available at a more affordable price.

https://www.ebay.com/itm/Motorcycle-12v-Battery-Voltage-monitor-alternator-Charge-warning-lamp-LED/201810446914?hash=item2efcd70a42:g:oUUAAMXQydtTOs8s

However this one needs a hole drilled it seems.
CB750 K2 - A work in progress
CB750 K1 - The less, said the better!
CB450 K1 - It's black.
CB400F Supersport - It's rusty!

Offline Bodi

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Re: Battery draining insanely fast
« Reply #34 on: October 08, 2018, 04:16:18 am »
"continuity between yellow wires" means what? Ther should be NO continuity between the yellow wires. Each yellw should have continuity (or low resistance, or roughly 0.5v on diode test) to either the big green  or the red wire with the meter leads one way around (no connection or diode junction to the other output wire) and opposite with leads swapped.

Offline Duke McDukiedook

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Re: Battery draining insanely fast
« Reply #35 on: October 08, 2018, 12:52:09 pm »
One of your coils could be bad even though it ohms out ok on the bench when cold. Had one that went south and was draining a battery. Telltale sign is it heats up very quickly when you turn the ignition on without firing it up.
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