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Old 09-28-2015, 10:43 AM   #1
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7 pin

On the 7 pin trailer plug is the 12 volt pin the one that charges the TT battery when on the road?
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Old 09-28-2015, 12:18 PM   #2
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Yep. It's not the one in the center though as that aux/back up lights.
You will have specific trailer relays and fuses under the hood, dedicated to those circuits.
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Old 09-28-2015, 12:20 PM   #3
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Yes. On some vehicles that pin is always "hot," on others the tow vehicle engine has to be running.
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Old 10-01-2015, 09:16 AM   #4
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One must ensure that the fuse is installed to energized the "charging" connection. On my 2005 Chevy I had to replace the dummy fuse with a real one (40 amp). On my 2011 the fuse was already installed.
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Old 10-01-2015, 01:07 PM   #5
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The factory had a dummy fuse on the #7 center pin on my Tundra.
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Old 10-01-2015, 05:46 PM   #6
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My F 150 had the "real" fuse in a plastic bag in my glove box.
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Old 10-01-2015, 06:56 PM   #7
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My TrailBlazer had the fuse in the fuse box. I just needed to plug it in. It was already in place in my Silverado.
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Old 10-03-2015, 09:13 AM   #8
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7 pin

I don't see a trailer charge fuse at all, I"ll have to ask a expert to look at it. Towing with this truck since new and didn't know it was not charging the TT batt. Our last TT had 2 batteries I guess that's why the batteries always had reserve power.
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Old 10-03-2015, 09:34 AM   #9
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Quote:
Originally Posted by MartyinSC View Post
Yes. On some vehicles that pin is always "hot," on others the tow vehicle engine has to be running.
Quote:
Originally Posted by allenr View Post
I don't see a trailer charge fuse at all, I"ll have to ask a expert to look at it. Towing with this truck since new and didn't know it was not charging the TT batt. Our last TT had 2 batteries I guess that's why the batteries always had reserve power.

Martin gave a diagram that is the same as paying an "expert" to look at it.
Get your multi meter and check it out.
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Old 10-03-2015, 09:51 AM   #10
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7 pin

I'll do that
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