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Dual battery wiring question

Old 08-15-2013, 07:32 AM
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Default Dual battery wiring question

Hey guys I'm not new to boating but new to the forum. I have a stingray 220sx that I just installed a kicker amp and Polk speakers that sounds amazing. I'm now concerned that the one starter battery I have may go dead if the radio is playing for a while. So I'm gona install a second battery and a switch to power the radio. The wiring in my boat isnt the greatest so right now I have about 5 positives and 5 negatives for different things, one being the radio on my starter battery. My question is when I go to install the second battery do I need to connect whatever I want the second battery to power on the second battery terminals? Or does it connect to the whichever battery and the switch changes which battery is gona power what. This may be a stupid question and has prolly been beatin into the ground but I appreciate everybody's input. Thanks
Old 08-15-2013, 11:23 AM
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Plenty of threads on what you want to setup.

There is always more than one way to do wiring right - it depends on how the boat is used.

For what you describe I would add the second battery and put the house loads like the radio on it. Most everything that is only used when running like trim, running lights, etc stays on the cranking battery.

Wire both batteries into a 1/2/both/off switch so the second battery can be used for cranking in an emergency. Have another on/off switch coming from the second battery and a main feed (fused) into your console so can run the radio and anything else that will be run with the engine off. Add a combiner (my fav is a C100 Yandina) between both batteries so the second battery gets charged no matter the position od the 1/2/all/off switch. That switch will normally be set to the cranking battery.

Run one main feed wire from the switch to a fuse block or terminal strip to distribute the load and grounds.
Old 08-15-2013, 12:51 PM
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As mentioned, a few threads and a few different ways of doing it. Gonna also depend on how much money you want to invest in your project. I just added a second battery using the Blue Seas Add-a-battery kit. Also installed a new fuseblock. I can help with this if you decide you want to go this route.
Old 08-15-2013, 06:12 PM
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Thanks guys for the responses. I have another question this one about the sound system. Like I mentioned before I only have one battery so when I wired the amp I terminated the positive and negative on the battery. Now when I go to trim up or down the speakers make a pop noise or the amp turns completely off. I thought that the battery might be getting drained so I hooked up a second battery for just the stereo and I had the same result. Do you think it's a ground issue where the amp should be grounded directly to the block or is it something else?
Old 08-15-2013, 11:08 PM
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Originally Posted by Stingray220 View Post
Thanks guys for the responses. I have another question this one about the sound system. Like I mentioned before I only have one battery so when I wired the amp I terminated the positive and negative on the battery. Now when I go to trim up or down the speakers make a pop noise or the amp turns completely off. I thought that the battery might be getting drained so I hooked up a second battery for just the stereo and I had the same result. Do you think it's a ground issue where the amp should be grounded directly to the block or is it something else?
A lot of electronics are sensitive to voltage fluctuations. If your 2 batteries are wired in parallel the voltage drop when using the tilt is likely the problem. That second battery needs to be isolated from the battery connected to the engine.

A ground well attached to the battery itself is as good as it gets.

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