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Old 03-30-2017, 04:33 AM   #81
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Originally Posted by rockfordroo View Post

The only time the battery itself feeds the brakes is if the emergency brake switch is pulled (at least on a TT - can't speak to a 5ver).

If the emergency brake switch is activated, it's because the trailer and TV have separated. The battery on the trailer is what will power the brakes if this happens which is why it is required to have at least 1 working battery on your trailer before towing.
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Old 03-30-2017, 05:07 AM   #82
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Modern alternators and electrical systems since 1960 have regulation and the voltage does not change. The current might change but this is based upon demand to charging/operational needs.

The Exhaust brake and tow haul do work together. If you have a integrated factory brake controller it may have adjustable braking force meaning more voltage for the brakes. I highly doubt tow/haul changes this.
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Old 03-30-2017, 10:50 AM   #83
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Originally Posted by B and B View Post
Modern alternators and electrical systems since 1960 have regulation and the voltage does not change. The current might change but this is based upon demand to charging/operational needs.

The Exhaust brake and tow haul do work together. If you have a integrated factory brake controller it may have adjustable braking force meaning more voltage for the brakes. I highly doubt tow/haul changes this.
I believe you're wrong. Both my Traverse and my Silverado's volt meter will vary from below 13.5 volts to above 14.5 volts depending on load. Lots of info on this on the Traverseforum.com.

From my Silverado's owners manual for the volt meter:
Voltmeter Gauge
When the ignition is on, this gauge indicates the battery voltage.

When the engine is running, this gauge shows the condition of the
charging system. The gauge can transition from a higher to lower or a
lower to higher reading. This is normal. If the vehicle is operating
outside the normal operating range, the charging system light comes on.
See Charging System Light pg 142 for more information. The voltmeter
gauge may also read lower when in fuel economy mode. This is normal.

Readings outside the normal operating range can also occur
when a large number of electrical accessories are operating in the
vehicle and the engine is left idling for an extended period. This
condition is normal since the charging system is not able to
provide full power at engine idle. As engine speeds are increased, this
condition should correct itself as higher engine speeds allow the
charging system to create maximum power.

The vehicle can only be driven for a short time with the readings outside
the normal operating range. If the vehicle must be driven, turn off all
accessories, such as the radio and air conditioner.

Readings outside the normal operating range indicate a possible
problem in the electrical system. Have the vehicle serviced as soon
as possible.
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Old 05-06-2017, 11:05 AM   #84
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Originally Posted by f5moab View Post
On GM vehicles, when tow/haul mode is selected, output voltage is increased to help charge the battery of the trailer (if there is a battery).
Really!!?? Never heard of that... cool if true
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Old 05-06-2017, 11:13 AM   #85
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Really!!?? Never heard of that... cool if true
It is true. You can get the same effect by turning on headlights.
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Old 05-06-2017, 11:16 AM   #86
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It is true. You can get the same effect by turning on headlights.
Well... I'm pretty up on the capability and options of my 2015 sierra 2500, but this one eluded me this is pretty awesome!
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Old 05-06-2017, 11:25 AM   #87
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Originally Posted by rocnrol View Post
Well... I'm pretty up on the capability and options of my 2015 sierra 2500, but this one eluded me this is pretty awesome!
When all else fails, read the instructions!

From my 2016 Silverado 2500's owner's manual, page 348:

To help charge a remote
(non-vehicle) battery, press the Tow/
Haul Mode button at the end of the
shift lever. If the trailer is too light for
Tow/Haul Mode, turn on the
headlamps to help charge the
battery.
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Old 05-08-2017, 08:57 AM   #88
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[QUOTE=rocnrol;1497188]Really!!?? Never heard of that... cool if true[/

It's in the manual.
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Old 05-08-2017, 09:13 AM   #89
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The large reving of rpm could be due to the grade braking where the truck uses the engine to brake on steep grades. Press and hold the tow button for 3 seconds to disable. Grade braking can be disabled independently of tow mode.
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Old 06-15-2017, 12:53 AM   #90
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My 1996 1 ton dually doesn't have a tow/haul button. My camper is a Cherokee 274 RK. It weighs about 6700 empty. I figure its at about 7200 loaded up. I also often carry either a golf cart or a Polaris RZR in the bed of the truck. That adds about 800 to 1100 pounds of weight. I've noticed that If I am willing to bleed off some speed when pulling on a hill (which I am willing to do) my transmission seldom slips out of lockup mode when I'm in Overdrive. In town or twisty very hilly areas I run in 3rd gear. Going down the interstate I do OK in overdrive. The 454 engine doesn't seem to complain. I hope the way I'm doing things I will be OK. I would love to have a tow/haul mode on my truck but I'm not going to get rid of it just for that.
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Old 06-15-2017, 05:56 AM   #91
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I tow a 8000lb dry, 11,000lb fully loaded T.T. with 6.6L diesel. When I'm on the flats I usually run cruise and take it out of tow mode and let it shift to 6th and get better mpg. I've heard people say I'll damage the tranny, but my neighbor does the same with his 16,000lb fifth wheel and he's been pulling it since 2008 and 50,000 miles and has never had problem with his transmission.
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