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Supply voltage to trailer battery

sirhuntalot1

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sirhuntalot1 Enthusiast

sirhuntalot1

Posted
Posted

There's been a lot of discussion about getting the trailer battery charged off of the truck alternator and I believe we have the correct answer in saying that on the 6.0 2500hd You should pull the #1 stud and replace with a green 40 amp fuse and make sure the wire is connected underneath the fuse box, but I was wondering if anybody has a clue as to how much juice or actual benefit we get from the charging end of the alternator and how long you would have to run the truck b4 seeing any benefit. Any ideas ??? :ughdance:

RICH256 Enthusiast

RICH256

Posted
Posted

Yes, put the fuse in the Aux. #1 stud as long as you do not have the dual battery option and you have the trailer harness. I use a 30 amp fuse and am charging two 6 volt golf cart batteries in series.

 

You will get a good charging current as long as the battery is not already near a full charge. You get some drop in the line so it is not as good as being under the hood but still can supply 10 amperes or more. As your battery gets charged the current drops off. Don't expect a quick charge result but you can recover a deeply discharged battery in a few hours of driving.

raidernut5 Enthusiast

raidernut5

Posted
Posted

i am a little confused as to all of this as it pertains to the tp2 auxilliary battery option on the 2500 6.0. so am i correct that you do not put the fuse in post 1, and if you do not does the alternator charge your trailer batts or not. is this not possible with the aux battery option? please clear this up for me.

RICH256 Enthusiast

RICH256

Posted
Posted
i am a little confused as to all of this as it pertains to the tp2 auxilliary battery option on the 2500 6.0. so am i correct that you do not put the fuse in post 1, and if you do not does the alternator charge your trailer batts or not. is this not possible with the aux battery option? please clear this up for me.

 

 

 

 

I can't give you a good answer for that one. I have a Duramax. I also ordered the 5th wheel pigtail. After installing the plug I did some measurements and saw there was no 12 volts for the trailer. Got back to that plastic plug in #1 and then saw the note about not using a fuse if you have the dual battery. I had to read the note a couple times to verify that my two battery set up did not apply. It said something about it being OK to use the fuse with diesels.

 

What I would do is to check at the plug to see if there is any voltage there. Perhaps there is an in-line fuse.

Plug wire diagram at:

 

http://marksrv.com/wiring.htm

Note that is from the inside of the plug.

RICH256 Enthusiast

RICH256

Posted
Posted

I just got a little more information on the TP2 auxiliary battery.

 

There is supposed to be some sort of isolator system from the start battery and it is supposed to have an in-line fuse located against the firewall behind the battery. I still have no idea of what they are doing with the Aux #1 post.

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