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How to properly hook up batteries and amp?

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How to properly hook up batteries and amp?

Old 02-13-2012, 08:20 PM
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Question How to properly hook up batteries and amp?

I have a very simple set up. Formula Thunderbird 233LS. Single Merc 5.7L I/O with 2 650cca dual purpose batteries hooked up to a standard battery switch off/1/both/2. Really just use the boat for cruising to/from the beach and bars/restaurants.
So I was thinking about getting an amp for my Jensen JMS2212 and some better speakers. I suppose that the 2 batteries are plenty for my setup. I suppose that one should just be used for starting the boat and the other should have all of the accessories attached to it. I was wondering if a battery combiner would make sense or is it only used with a charger as I only have an alternator?
Do I need to get some kind of capacitor to put between the accessory battery and the amp to clean up the power?
I have never hooked up an amp before, so any advice would be helpful.


Last edited by BlenderBoy; 02-13-2012 at 08:31 PM.
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Old 02-14-2012, 04:22 AM
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Shouldn't need capacitor. Just hook the amp to the common on the switch put protection in the line and be done with it.
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Old 02-14-2012, 05:00 AM
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Put all the audio components on the same battery feed.
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Old 02-14-2012, 07:34 AM
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Two batteries, one for starting, gauges, trim, etc., and the other for everything else will be fine.

Installing a battery combiner is a good way to keep both charged and prevent the stereo from draining the batteries and preventing you from starting the engine to get back home.

You shouldn't need a capacitor to install the amplifier, but you do need to follow the installation instructions, make sure the power cables for the amp are large enough for the maximum power consumed by the amplifier, and install proper overcurrent protection in the positive cable that powers the amplifier. It should be within seven inches of the source of power.

Use proper installation proceedures and marine rated cable and connectors.
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