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How To Set up 7 Pin Trailer Connector for Constant Power

Constant power for tailgating or whatever you need
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Re: How To Set up 7 Pin Trailer Connector for Constant Power

Postby FR8TRN » Jan 08 2013, 3:48pm

Simply adding a battery in parallel to the existing can cause issues with charging and if the batteries aren't completely identical your system will only be as good as the weaker battery. Also a short or other problems in one battery will degrade the other and the entire system. At a minimum use an isolator, the solenoid type here is probably the best option as diode type have about a .5V loss.
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Related Topics  Curt T-connector and 7 pin trailer plug   2009 Silverado 7 pin trailer connector   7 Pin Connector to Combo 7 / 4 pin connector upgrade   No power to trailer connector   7 Pin Connector Mystery   Trailer Wiring Connector In Bumper   Replace 7-pin Trailer Wiring Receptacle with Combo 4 / 7   Trailer power wiring question   constant ticking noise.   4WD Constant Clanging and Clicking-Accelerating and Stopping   7 way connector messed up   7 blade and 5 prong connector in 14's   ACDelco Connector ID Assistance   Wire connector for fuse block 
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Re: How To Set up 7 Pin Trailer Connector for Constant Power

Postby steved » Jan 08 2013, 4:56pm

FR8TRN wrote:Simply adding a battery in parallel to the existing can cause issues with charging and if the batteries aren't completely identical your system will only be as good as the weaker battery. Also a short or other problems in one battery will degrade the other and the entire system. At a minimum use an isolator, the solenoid type here is probably the best option as diode type have about a .5V loss.



But the diesels run two batteries in parallel without issues...there's nothing really different between those charging systems?

If I did this, I would buy two new batteries...probably cheaper to buy two aftermarket than one OE GM.
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Re: How To Set up 7 Pin Trailer Connector for Constant Power

Postby FR8TRN » Jan 08 2013, 5:28pm

Just running a pair of cables from one battery to the other isn't quite how it is done. GM uses a couple relays to determine the status of the primary battery before putting the secondary battery in the charge circuit. And really the only difference for them between Diesel and Gas is the size of the Fuse (125A vs 175A).

When I get a little quality 1-on-1 time with my new truck I'm going to look at it a little closer to see if I can follow GM's plan for wiring in 2 batteries, but it'll be much warmer before I have a chance to do that.

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Re: How To Set up 7 Pin Trailer Connector for Constant Power

Postby bbrown » Mar 27 2013, 2:31pm

FR8TRN wrote:Simply adding a battery in parallel to the existing can cause issues with charging and if the batteries aren't completely identical your system will only be as good as the weaker battery. Also a short or other problems in one battery will degrade the other and the entire system. At a minimum use an isolator, the solenoid type here is probably the best option as diode type have about a .5V loss.


The best quality diode isolators from "Hell Roaring Technologies" only have .05 - .01 V losses (yes that's hundredths) according to their specs. depending on which model you choose and their device dissapates less watts than your typical diode type isolator/combiners. They are solid state and allow you to remote combine the batteries for emergency starting with the optional remote module. I've had no issues with mine in the 2 years I've been running it. The only downside...expensive. As always, you get what you pay for.
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Re: How To Set up 7 Pin Trailer Connector for Constant Power

Postby Zeker11 » May 14 2013, 10:52pm

It says in the owners manual to remove the fuse(68) if Aux battery is installed.Would this have anything to do with where the red/black wire would go(on the post or to the aux battery)?? :? :?
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Re: How To Set up 7 Pin Trailer Connector for Constant Power

Postby bbrown » May 14 2013, 11:59pm

No clue...I've never seen inside a 2013 model.
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