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Tom VanGundy

Uninteruptable 12v For A Motorcycle

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I am going to once again ask the most knowledgeable people I know to help me fix a problem with my motorcycle.

Problem:

When I start my motorcycle, more than half the time the memory in my stereo is reset.

Details:

I have a very cheap stereo. The power feed for the memory comes straight from the battery. When starting apparently the voltage drops below what is needed to keep the memory of radio station presets.

Possible solution:

Have a rechargeable 9v & 2 AA batteries with a diode to keep the 12v to the stereo.

Problems:

Not sure if this will work. Not sure where to put the diode. Not sure if it will overcharge the batteries and cause a possible fire sometime when riding.

Correct solution:

I have nothing to put in this area. That's why I'm posting here.

I would like to thank you in advance for any help you can give me on this problem.

Tom

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Cheapest and most foolproof solution would be to try and locate a new battery with higher cranking amps.

Problem with car stereos is the power for the memory can source up to .5amps depending on who made it (truck stop specials are the worst). Had a Jensen that would kill a car battery if not started once a week.

The expensive alternative would be to place a 1 Farad capacitor between the + and - leads on the stereo, and add a 1A diode between the + contact on the cap and battery. Big drawback to this is, the cap would run around $150.

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Cheapest and most foolproof solution would be to try and locate a new battery with higher cranking amps.

Problem with car stereos is the power for the memory can source up to .5amps depending on who made it (truck stop specials are the worst). Had a Jensen that would kill a car battery if not started once a week.

The expensive alternative would be to place a 1 Farad capacitor between the + and - leads on the stereo, and add a 1A diode between the + contact on the cap and battery. Big drawback to this is, the cap would run around $150.

I replaced the battery this year with the highest CCA I could find. I have a lot of electrical items on the bike and wanted a good reserve.

Any possibility of the rechargeable batteries working?

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Your logic is good. They do that all the time with motor homes. Although, they use bigger batteries. The 9v & 2 AAs are not designed for that kind of a charging cycle. Not sure how they would hold up. On the other hand, it is not a very expensive experiment. You can always swap out for a heavier battery later.

An old trick when replacing your battery is to connect a 9v batter to a cigarette lighter adapter. It is usually enough to keep the radio from loosing its settings.

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If you go the rechargeable battery route (preferably NiCads), there needs to be some kind of "smart" regulation, and a means of alternating them between charging and discharging (using them); otherwise the batteries will eventually blow.

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Put a meter on the radio wire to see how low voltage is actually dropping during the start.

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