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The answer to this may be so obvious that I'm almost too embarrassed to ask; however, here goes:

I have a high-end battery charger for my car which charges through the cigarette lighter receptacle. I want to use the charger on my motorcycle which has two (2) ports - one in a rear case and one on the front fairing. As a preliminary test, I plugged my phone charger into each port. The charger has a red light. With the motorcycle's ignition "off", the red light does not light; it only lights when the bike is running.

Am I correct in assuming that, since no power is outputted when the bike is shut off, no recharging will occur either?

migrated from electronics.stackexchange.com Nov 6 '14 at 18:52

This question came from our site for electronics and electrical engineering professionals, students, and enthusiasts.

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    Yes. Most vehicles disconnect the battery when the ignition is off to prevent the battery from discharging itself overnight. No one wants to wake up to a dead car battery. – ACD Nov 6 '14 at 18:44
  • Pat, I must say that EE.SE is a wrong place for this question. EE.SE is about design of electronics, and questions about use of electronics are off-topic. There is a similar stack Mechanics.SE (motor vehicle maintenance stack), where this question might be a better fit. So, I'm migrating it over there. – Nick Alexeev Nov 6 '14 at 18:51
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    Ha ha ha, so typical. Can't have a question that is even a shade out of the bounds of this exact, specific, little thing that I've defined for my StackExchange(SE). No wonder people are being turned off by this site. – Jerome Wiley Segovia Dec 2 '16 at 20:07
  • Can you tell me where you got your charger? – Mawg Dec 16 '16 at 9:45
  • I'm not sure I'm doing this correctly, but Mawg asks where I got the charger. Since the charger was specifically a BMW product, and because I was [dubiously] persuaded that this was the only charger that would work with the CANBUS system, I recall that I bought the charger directly from BMW Motorcycles. – Pat Dec 19 '16 at 15:04
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Depends on make and model. Some cars come with cigarette/accessory power outlets that are keyed, some come with outlets that are always on, and some have both.

Keyed outlets switch on and off with the ignition switch position. That switch powers a relay that turns on power for most accessories.

An always on outlet is a straight (fused) connection to the battery. You can get a kit for a few bucks at any auto store.

To find out the exact wiring for your motorcycle, find the wiring guide or schematic in the factory service manual.

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Since there isn't a connection when the key is off, the battery isn't going to charge.

Most of the float chargers I've seen, has several different attachment methods. With the one I had, it included a direct connect to the battery which had a quick disconnect. If the one you have doesn't have something like this, you can always pick up a separate one for about $20. Just plug it in when you're not riding the bike.

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