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Old 04-06-2009, 03:33 PM   #1
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TV Ground for Charging

I am getting ready to run a heavy charge line(#6) from the TV common positive to the trailer. Nice new two pole #6 disconnect has a grounding leg with a connector for a 1/4 " bolt. Like bolt to the truck frame. This would save me money on wire. Learned opinions sought. I think I'ld put a 100amp fuse on it.
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Old 04-06-2009, 03:56 PM   #2
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The frame will carry any current you want. But I would check it the battery is grounded directly to the frame or to the engine and then through a flex strap to the frame. If so make sure the flex strap is in good condition.

What are you powering in the trailer that requires that current?

How about a picture of the connector?
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Old 04-06-2009, 05:42 PM   #3
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Why ???

I would guess you are trying to power an inverter while running down the road and maintain the trailer battery.

That brings up the question of the TV alternator.

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Old 04-06-2009, 10:28 PM   #4
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Actually I want to charge the trailer batteries while on the road and or run the fridge on DC. The line in the 7 way is too small, the voltage wouldn't be high enough. The alternator is the standard on a 2500 GMC, I think it's 140amps. I was considering adding the second one but was discouraged by the dealer as they had problems getting the system to work. I'll revisit that another time.
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Old 04-08-2009, 07:58 AM   #5
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The wire on the 7 way pin 4 (battery charge line) is 10 gage I would think that would be good enough.

Changing out to 6 gage would mean running new wire all the way from the alt in the TV plug and the wire in the trailer from the plug to the converter to gain any current carrying increase.

However the answer is yes you can do it as described in your original post.

Garry
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Old 04-08-2009, 12:43 PM   #6
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The wire on the 7 way pin 4 (battery charge line) is 10 gage I would think that would be good enough.

Changing out to 6 gage would mean running new wire all the way from the alt in the TV plug and the wire in the trailer from the plug to the converter to gain any current carrying increase.

However the answer is yes you can do it as described in your original post.

Garry


Normally enough. But on the road dry camping I'll need more volts making it to the trailer to recharge in the drive between stops. I already have #6 from the enter box to the converter.
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Old 04-10-2009, 02:12 PM   #7
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The frame will carry any current you want. But I would check it the battery is grounded directly to the frame or to the engine and then through a flex strap to the frame. If so make sure the flex strap is in good condition.

What are you powering in the trailer that requires that current?

How about a picture of the connector?
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Old 04-10-2009, 02:34 PM   #8
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I understand your theory, and I do like to have things over-built, but I don't think you'll see and appreciable lowering of recharge time over the 7-way connection. Solar panels on the roof of the trailer would be my first pick in extending time for dry camping. Then they're charging even when not hooked to anything. Only my opinion, of course.

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Old 04-12-2009, 10:43 AM   #9
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I understand your theory, and I do like to have things over-built, but I don't think you'll see and appreciable lowering of recharge time over the 7-way connection. Solar panels on the roof of the trailer would be my first pick in extending time for dry camping. Then they're charging even when not hooked to anything. Only my opinion, of course.

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You have spent little time in New England. A good day here is one when it doesn't rain all day. It's actually traveling on hot days in your country and keeping the fridge going on DC that's the major issue. Or AC off an inverter.
I may have this confused but my thinking is this.
#6 yields higher voltage to the trailer battery. Voltage downs with distance from the source and depends on wire size. Thus when it is 90% the voltage difference will be enough to create a charge and top it off. When the batteries are 60% the heavier wire will allow a faster charge as it will take higher amps. I'll have to check it when it's done.

I don't think the 7 Way was intended to "charge" the battery but to power the trailer exterior lights and brakes without discharging the batteries.

Here's some good stuff. http://www.ccis.com/home/mnemeth/12volt/12volt.htm
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Old 05-08-2009, 06:57 AM   #10
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What is the largest wire ga a standard 7 pin connector will support ?
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Old 05-08-2009, 07:25 AM   #11
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What is the largest wire ga a standard 7 pin connector will support ?
The ground and charging line should be #10, brakes are #12, all others #14. You will have a hard time fitting larger than #10 wire on the taps.
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Old 05-08-2009, 08:31 AM   #12
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The ground and charging line should be #10, brakes are #12, all others #14. You will have a hard time fitting larger than #10 wire on the taps.
I've gotten #8 to fit by splitting and putting 1/2 on each side of the screw. My real question is how much will the blades themselves handle ?
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Old 05-08-2009, 08:34 AM   #13
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I think the blades could handle 40 amps if you can fit a #8 wire on it. Keep the brass clean.
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Old 05-08-2009, 10:33 AM   #14
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Normally enough. But on the road dry camping I'll need more volts making it to the trailer to recharge in the drive between stops. I already have #6 from the enter box to the converter.
Don't count on the engine recharging your trailer batteries while driving. Yes there will be some initial charging just after you start but the alternator will dropping off high charge as soon as it sees the TV batteries are charged, about 20 miles. The regulator in the alternator looks at the batteries and charges as required. Since the TV batteries are close to the alternator and there is voltage drop between the TV batteries and the trailer batteries it will respond to the charge on the TV batteries as being charged.

I proved this the hard way. We traveled all day making stops every 3 or 4 miles, about 20 stops. Hooked up the next day and took off down the road. After several more stops that day we had a dead battery in the TV because the alternator was seeing the trailer batteries and r4duced the charge rate to below what would hold the TV batteries up enough the start the TV.

One thing you can do to increase the capacity of the 7 pin connector is to solder to wires in place once you have tightened to screw. Splitting the wire on either side of the screw is the only way you will get a large wire under the screw and cap.
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