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How to Charge a Trailer Battery for Use with a Bulldog Jack  

Updated 04/17/2018 | Published 04/14/2018



Question:

If I understand what I have read it is better to mount a battery on the trailer to run the jack rather than wire it through and to avoid overheating the 7 way plug. Would it then be reasonable and safe to keep that battery charged through the 7 way plug? Also, would it be safe to keep the battery in a box inside the cargo trailer instead of outside? Thanks,

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Expert Reply:

What you described is actually the best solution!

Connecting your battery to 12V Power wire from the 7-Way on your trailer is a great way to provide a maintenance charge on your battery to operate a Bulldog jack like part # BD500199. Mounting a battery inside a box like part # 329-HM300BKS inside your trailer will further help to keep your battery safe from the elements (although battery boxes do a pretty good job at that).

Please note that the 12V power from your vehicle will not necessarily charge your battery, it will just help to maintain it. You can either use a battery charger like part # CTEK56353 to recharge your battery when an AC outlet is present, or use a battery charger like part # 331-BCDC1240D along with a solar panel like part # PTW2997 to help charge your battery in addition to the 12V power maintenance from your your tow vehicle.

I have attached a picture showing how the second method would be installed for you to reference should you decide to go that route.

expert reply by:
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Jon G
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