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Old 09-02-2014, 06:02 PM   #1
Dooga OP
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Reviving my run down K1100LT batt

I covered my bike with a wet beach towel aster drying her off after a ride après rain and missed the key in the ignition and the bike basically on and draining. Came out 6 hours later and Pōni was still there but she was juiced out.

Left the keys in and the lights on on my K1100LT all day (not proud). Tried to bump her down the hill but she wouldn't turn over. Hazards lights dim, gear indicator on, no headlight. Pretty low. Next steps? Jumping off of a car battery in the morning? Do's and don't's?

Thanks guys!
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Old 09-02-2014, 10:52 PM   #2
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Is the battery buggered? Will it never take a charge again? The battery was almost new. Will I need to end up bailing on it and need to get a new one?
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Old 09-03-2014, 08:45 AM   #3
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Just get it on a charger and recharge it FFS.
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Old 09-03-2014, 09:20 AM   #4
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Just get it on a charger and recharge it FFS.
Hey now! Battery chargers are pretty exotic and hard-to-find pieces of kit and he may not have one.
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Old 09-03-2014, 09:23 AM   #5
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Hey now! Battery chargers are pretty exotic and hard-to-find pieces of kit and he may not have one.
Autozone sells cheapo trickle chargers for $15 FFS go get a charger.
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Old 09-03-2014, 09:33 AM   #6
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If you jump it from a car battery make sure that the car is not running.
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Old 09-03-2014, 09:58 AM   #7
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If you jump it from a car battery make sure that the car is not running.
+1

Since a car at idle is carrying about three times the amperage of a motorcycle's charging system at full tilt, yeah, don't do that. Current is common on a parallel circuit.
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Old 09-03-2014, 10:47 AM   #8
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You won't know if the battery is or isn't buggered for good till you recharge it and see if it holds a charge.
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Old 09-03-2014, 11:01 AM   #9
AZbiker
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Autozone sells cheapo trickle chargers for $15 FFS go get a charger.
Does Autozone sell sarcasm detectors too?

http://www.sarcasmdetector.com/product.html
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Old 09-03-2014, 11:06 AM   #10
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Old 09-03-2014, 09:17 PM   #11
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Old 09-04-2014, 02:01 AM   #12
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Quote:
Originally Posted by Tripped1 View Post
+1

Since a car at idle is carrying about three times the amperage of a motorcycle's charging system at full tilt, yeah, don't do that. Current is common on a parallel circuit.
The amount of electrical ignorance demonstrated by posts such as yours on The Internet is stunning.

"Current is common on a parallel circuit?" WRONG! Voltage is common on a parallel circuit.

Alternators' outputs are limited by the VOLTAGE REGULATOR. An alternator will only put out enough current to maintain the upper voltage limit of its voltage regulator.

Jumping a bike from a running car is just fine.
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Old 09-04-2014, 02:16 AM   #13
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A single deep discharge is not fatal to most batteries.
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Old 09-04-2014, 02:20 AM   #14
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Originally Posted by MauiCowie View Post
The amount of electrical ignorance demonstrated by posts such as yours on The Internet is stunning.

"Current is common on a parallel circuit?" WRONG! Voltage is common on a parallel circuit.

Alternators' outputs are limited by the VOLTAGE REGULATOR. An alternator will only put out enough current to maintain the upper voltage limit of its voltage regulator.

Jumping a bike from a running car is just fine.
Quote:
4. "You can find TOTAL RESISTANCE in a Parallel circuit with the following formula: 1/Rt = 1/R1 + 1/R2 + 1/R3 + ... "

Before we get into the calculations, remember what we said at the start of this section: "The total resistance of a parallel circuit is NOT equal to the sum of the resistors (like in a series circuit).

We will use a parallel circuit with 3 paths as an example (it could be 2, 4 or a 1000 resistors in parallel). The power source is providing 12 volts and the value of the resistors are 5 Ohms, 5 Ohms and 2 Ohms.
What do you think the 1/R for motorcycle with just lights and ECU to run is next to an automobile. Since you are going to get the entire current for the entire system across that line, feel free to charge you bike off of a running car, its your shit.
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Old 09-04-2014, 02:34 AM   #15
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Originally Posted by Tripped1 View Post
What do you think the 1/R for motorcycle with just lights and ECU to run is next to an automobile. Since you are going to get the entire current for the entire system across that line, feel free to charge you bike off of a running car, its your shit.
Feel free to continue to demonstrate your ignorance (I find it amusing) but the FACT is that the output of an alternator is limited by its voltage regulator. The notion that a car's alternator can somehow "push" excessive current through a motorcycle's electrical system is, in a word, idiotic and not grounded (pun intended) in reality.

You could hook up a 5,000,000 watt alternator to a motorcycle but as long as it's voltage regulator limits the VOLTAGE POTENTIAL to say, 14V or less, then the motorcycle will be fine.
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