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Will 7-Way Connector Charge Auxiliary Trailer Battery

Question:

My old trailer use to charge the on board battery. My new trailer does not. Is the Yellow AUX. wire supposed to be connected to the battery to charge it?

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Expert Reply:

The yellow wire on the Hopkins 7-Way RV Style Connector with Molded Cable # H20046 will not be able to charge an on-board battery, it should really be used for reverse lights. To charge the auxiliary battery on your trailer the best option is to use a battery charger such as the CTEK MULTI US 3300 12-Volt Universal Battery Charger # CTEK56353 which you would plug into a standard outlet.

You can maintain that charge when driving by running # 10-1-1 wire along with 40 amp circuit breaker # 9510 in-line to the black wire (12 volt hot lead); to keep that maintenance charge going only when your tow vehicle is running you will need to use solenoid # TR118665.

Your other option would be to use the Tekonsha Two Stage 12V DC Battery Charger # 2024-07 and install this onto the 12 volt wire and run it to the positive and negative side of your auxiliary battery.

I have added links to video reviews of both chargers for you to take a look at.

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expert reply by:
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Kyle S

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