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Unread 06-10-2016, 04:15 PM   #1
Not Yet Wild
 
Join Date: May 2014
Posts: 69
Default Aux battery with relay?

Has anyone ever wired up an aux 12V battery with a relay so that some things will be turned off with the key switch? Is a relay even necessary? How much current can a stock key switch handle? I want my light bar/headlights/tail lights/horn to shut off with the key and I want the (future) stereo to stay on.

Would this work?
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Also what chargers do you guys use?
This one looks like it would work well. I'm liking the dashmount adapter. It makes it easy to plug in and also has a battery life indicator.
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Unread 06-10-2016, 04:50 PM   #2
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Default Re: Aux battery with relay?

The Relay coil needs to match your pack voltage, it will only draw about 0.02Amps from the key switch:
Link to 48v 30 amps Normally Open contacts relay
You also need a flyback diode in parallel with the relay coil, the cathode (end with a stripe) goes towards the positive activation wire.
Link to 1N4007 diode
Wire the relay coil to the key switch like this:
http://www.buggiesgonewild.com/attac...ux_battery.jpg
That NOCO charger should work fine.
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Unread 06-15-2016, 01:21 PM   #3
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Join Date: May 2014
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Default Re: Aux battery with relay?

Thank you for the information. I'm in the process of getting the parts ordered. What are others using to hold down the battery? Unfortunately a box won't work since there would be no room to take the battery in/out. Is something like this my only choice?

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