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Old 05-11-2012, 08:34 PM   #1
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Surplus Current?

In preparation for buying a new 5er, I just bought a 2011 Silverado 2500 diesel. It came with two batteries and dual 125 amp alternators. It seems a shame to waste all that capacity, but the wires in the standard harness are much too small to make much use of it. Is there a convenient way to use more of that 150 amps to charge the house batteries?
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Old 05-11-2012, 09:05 PM   #2
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yes with the trucks 7 pin trailer connector is the battery charge circuit. It should supply juice to the trailer while you are hooked up and the engine is running
my ford had 20 amps of power going to the rv.

hih
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Old 05-11-2012, 10:04 PM   #3
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i know that the 7 pin connector will do some charging, but the wire gauge just isn't enough to pass even a fraction of that current. BTW, a small typo. It is 250 amps, not 150 amps.
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Old 05-11-2012, 10:24 PM   #4
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You are right, the standard wiring is woefully inadequate in size to carry enough current. I cannot help with a wiring remedy, but the auto electricians here will. You might find the needed information on the dieselplace.com or duramaxforum.com websites, dedicated to GM diesel trucks, engines, and components.
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Old 05-11-2012, 10:33 PM   #5
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You need quick connectors like this to handle the high current flow: 500 AMP 2 GAUGE ELECTRIC WINCH QUICK CONNECTOR / DISCONNECT PLUGS W/ DUST COVERS | eBay
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Old 05-17-2012, 02:17 PM   #6
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The 125 amp batteries are not supplying 125 amps all the time. They are actually 125 amp-hour batteries. That means they will supply 1 amp for 125 hours, or 5 amps for 25 hours, etc. The larger wiring from the batteries will carry the 200+ amps necessary to start your engine during the brief starting cycle. The wiring in the 7-pin plug is adequate for the current necessary to charge the on-board batteries in the TT.
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Old 05-18-2012, 07:12 AM   #7
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Quote:
Originally Posted by schrederman View Post
The 125 amp batteries are not supplying 125 amps all the time. They are actually 125 amp-hour batteries. That means they will supply 1 amp for 125 hours, or 5 amps for 25 hours, etc. The larger wiring from the batteries will carry the 200+ amps necessary to start your engine during the brief starting cycle. The wiring in the 7-pin plug is adequate for the current necessary to charge the on-board batteries in the TT.
I think you misunderstood my original post. There are two 125 amp alternators. I didn't state the capacity of the two batteries.

Joel
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Old 05-18-2012, 08:27 AM   #8
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Quote:
Originally Posted by J Birder View Post
I think you misunderstood my original post. There are two 125 amp alternators. I didn't state the capacity of the two batteries.

Joel
DOH!!! Sorry....
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Old 05-20-2012, 06:42 AM   #9
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250 amps is way too much amperage to charges batteries. A beefy battery charger is only putting out about 40 amps. It's probably more like 3 or 4 amps tops going to the trailer to charge batteries. Of course if you insist you could run heavier wire to the 7 pin connector and then heavier wire to the trailer.
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