Go Back   iRV2 Forums > MOTORHOME FORUMS > Toads and Motorhome Related Towing
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
 
Thread Tools Search this Thread Display Modes
 
Old 01-28-2010, 08:50 AM   #1
Junior Member
 
Injun Joe's Avatar
 
Join Date: Jan 2010
Location: Houston TX
Posts: 15
US Gear Unified Tow Brake For Hummer H3

09 Safari Cheetah and 08 Hummer H3 are the two parts to this puzzle.

My research indicates I should go with the Unified system since the Hummer H3 has an electric not a vacuum brake system.

Does anyone have this or similar system and any comments? Thanks.
__________________

__________________
Joe/
Injun Joe
09 Safari Cheetah 42PAQ 08 H3 Alpha Houston, TX
Injun Joe is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 01-28-2010, 09:54 AM   #2
Senior Member
 
Jeff_S's Avatar
 
Alpine Owners Club
Join Date: Jun 2006
Location: Glendale, AZ
Posts: 160
The Unified Tow Brake System will pull down on the brake pedal via a selenoid, so that's the same action as your foot.

However, the UTBS also includes a vacuum pump that is added to the vacuum line going to the brake booster under the hood. That pump is energized any time the UTBS is activated. Therefore, the UTBS is truly applying "power assisted" brakes each time, and the selenoid's work is reduced.

If the H3 is electrically boosted, I guess you would want to power that booster instead of the vacuum pump. Whether that is possible, I do not know.

Additionally, the towed vehicle should have a constant +12VDC from the coach, so that operation of the vacuum pump does not drain the vehicle battery.

Here is a diagram of the whole UTBS layout.

I think I found the answer!

UTBS Installation Supplement for GM vehicles with factory installed vacuum pump/electronic check valve on Power Brake Booster
.
__________________

__________________
"When you see a shooting star, remember those race drivers taken
from us and are now driving in the Gran Prix of The Heavens"
** Ayrton Senna, May 1, 1994 ** Dale Earnhardt, February 18, 2001
Jeff_S is offline   Reply With Quote
Old 01-28-2010, 10:16 AM   #3
Senior Member
 
wa8yxm's Avatar
 
Damon Owners Club
Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 22,787
The vacuum pump on the US-gear system can be omitted if you don't need it.. it should be possible to wire the Hummer's brake booster system so it's always live (Are you sure it's electric?)

Or, if the brake booster works with the ignition off, You are good to go with the US-Gear system.

As for keeping the towed battery charged.. US-Gear already thought of that and a 40 amp "Tie Line" between the chassis battery and the towed battery is already part of the design

DO upgrade the ground lead though.. Most light cables do not have nearly enough ground on 'em.
__________________
Home is where I park it!
wa8yxm is offline   Reply With Quote
Old 01-28-2010, 10:23 AM   #4
Senior Member
 
Jeff_S's Avatar
 
Alpine Owners Club
Join Date: Jun 2006
Location: Glendale, AZ
Posts: 160
Injun Joe,

Though I wasn't incorrect earlier, here's a better answer ...

Looks like the UTH-1000 is specifically for electric-hydro boosted vehicles.

So, US Gear should has your situation covered.

It's great not having to move a braking device out of the vehicle every time you disconnect. The only extra action the UTBS takes is to replace the breakaway switch key that is cabled to the coach with a stand-alone key so you can drive away.
__________________
"When you see a shooting star, remember those race drivers taken
from us and are now driving in the Gran Prix of The Heavens"
** Ayrton Senna, May 1, 1994 ** Dale Earnhardt, February 18, 2001
Jeff_S is offline   Reply With Quote
Old 01-28-2010, 01:01 PM   #5
Senior Member
 
Winnebago Owners Club
Join Date: Dec 2009
Location: Las Vegas, NV
Posts: 819
Jeff-S: How about a little more info on the "stand alone key". Sounds interesting.

Kerry
__________________
two-niner is offline   Reply With Quote
Old 01-28-2010, 04:20 PM   #6
Junior Member
 
Injun Joe's Avatar
 
Join Date: Jan 2010
Location: Houston TX
Posts: 15
I talked to a local installer about this product and we determined that this is the appropriate kit: Unified Tow Brake Towed Vehicle Kit (TVH-1000K) Electric Hydro-boost Operating and Installation Instructions

It is the TVH-1000K which will work with the Hummer system and also with the Monaco pre-wiring setup in the coach.

I still have to look in to the break-away key.

By the way, none of this towing business is cheap, especially if one has to buy the tow bar (Aventa LX), Blue Ox base plate, wiring, Unified Tow Brake, labor, etc.
Newbies, like me, should be prepared to cough up some serious coin, or possibly buy used components. Ain't RVing fun?

Thanks to all for the great advice.
__________________
Joe/
Injun Joe
09 Safari Cheetah 42PAQ 08 H3 Alpha Houston, TX
Injun Joe is offline   Reply With Quote
Old 01-28-2010, 05:20 PM   #7
Senior Member
 
Jeff_S's Avatar
 
Alpine Owners Club
Join Date: Jun 2006
Location: Glendale, AZ
Posts: 160
Quote:
Originally Posted by two-niner View Post
Jeff-S: How about a little more info on the "stand alone key". Sounds interesting.
Not THAT interesting.

The key for the breakaway switch when towing is attached to a long cable that attaches to the coach. When unhooking the vehicle, the breakaway switch key is removed (temporarily activating the Unified Tow Brake) and is replace with a key that has nothing attached to it. The "standalone" key is merely to keep the breakaway switch open for normal driving of the vehicle.

I lied, there is a split ring on the standalone breakaway key to pull on when removing it to connect up to the coach.

I believe both keys came with the Unified Tow Brake, one key on the cable, and one standalone key.
__________________
"When you see a shooting star, remember those race drivers taken
from us and are now driving in the Gran Prix of The Heavens"
** Ayrton Senna, May 1, 1994 ** Dale Earnhardt, February 18, 2001
Jeff_S is offline   Reply With Quote
Old 01-29-2010, 10:02 AM   #8
Senior Member
 
hardy1000's Avatar
 
Monaco Owners Club
Join Date: Feb 2009
Posts: 1,305
Quote:
Originally Posted by Injun Joe View Post
09 Safari Cheetah and 08 Hummer H3 are the two parts to this puzzle.

My research indicates I should go with the Unified system since the Hummer H3 has an electric not a vacuum brake system.

Does anyone have this or similar system and any comments? Thanks.
Call Unified they will fix you up
__________________
Del & Lori 2007 Diplomat 40PDQ - 2009 Jeep Wrangler Unlimited Rubicon.
hardy1000 is offline   Reply With Quote
Old 01-29-2010, 11:15 AM   #9
Senior Member
 
wa8yxm's Avatar
 
Damon Owners Club
Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 22,787
Quote:
Originally Posted by two-niner View Post
Jeff-S: How about a little more info on the "stand alone key". Sounds interesting.

Kerry
I will give you two answers

The short answer is this: The break-a-way "key" (Or plug) that goes into the swith is nothign more than a piece of plastic, Shaped to fit and do the job. WIth a ring in it and a cable attached

The "Stand alone key" is an identical piece of plastic, with a ring in it, and no cable attached.

The long answer: Or what is inside that switch box

This is not exactly how it's buit but it works for a description

Imagine if you will a plastic cloths pin. Now on the "Tip" end of this cloths pin drill a hole through both "Arms" of the pin.. Open the pin and run a screw up through the hole to the threads are on the outside of the pin, apply washer, nut washer, wire, nut. When the pin is closed the two screws should touch.. You now have the "Guts" of a break-away switch

The plastic goes into the "Jaws" of the pin, forcing the two screws apart.. Pull it out and the spring snaps the jaws shut, closing the circuit and grounding the break-a-way lead activating the brakes.

NOTE: this is not exactly how it's built.. but the concept is identical.

IN either case the "Drive off" key or "Stand Alone" key is identical to the break-a-way plug

ALternative.. I put a clip on the end of the cable and leave the plug in place both ways.. This is easier.. but more dangerous cause once when I pulled the plug for testing I found the very simply almost no way it can fail switch.....failed.
__________________
Home is where I park it!
wa8yxm is offline   Reply With Quote
Old 01-29-2010, 02:04 PM   #10
Senior Member
 
Winnebago Owners Club
Join Date: Dec 2009
Location: Las Vegas, NV
Posts: 819
Hey' my 06 Grand Vitara came equiped with all that. I did not know it was called a stand alone key. No manual.
Last year I bought two of them(keys) at Quartzsite for $2.99 each.
Another mystery solved!!

Kerry
__________________

__________________
two-niner is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Roadmaster 9700 tow car brake ctcamper Toads and Motorhome Related Towing 4 03-06-2009 05:39 PM
US Gear Unified Tow Brake: New Installation in '04 Alpine Mike & Mike Alpine Coach Owner's Forum 4 11-01-2007 04:52 PM
Ford Escape "Toad" and a US Gear Unified Controller park_ridge_dave Newmar Owner's Forum 3 02-19-2007 12:21 PM
Pre-wired for Unified Tow Brake HD tech Workhorse and Chevrolet Chassis Motorhome Forum 7 08-20-2006 05:48 PM
Tow Vehicle Emergency Brake on GMC 3500 Tootall Trailer Towing and Tow Vehicles Discussion 5 08-24-2005 06:52 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 02:12 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.