RV Trip Planning Discussions

Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Alpine Coach Owner's Forum
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 03-25-2019, 03:37 PM   #1
Senior Member
 
Ljwt330's Avatar
 
Join Date: Jan 2018
Location: Capistrano Beach, California
Posts: 686
Towed plug wiring

2004 Alpine with Vansco.

My coach has a 6 pin tow plug that is wired with only 4 wires--tail lights, left turn/brake, right turn/brake, and ground.

The wire loom in the engine compartment has 6 wires, 5 of which are white and one black. The black wire (ground) and 4 of the white wires are spliced to a color coded loom that goes to the "black box" that changes the lighting to 4 wire, with the turn/brake on one circuit for each side.

On the input side of the box are red (12+?), white (ground), yellow (lft t/s), green (rt t/s), and brown (tail lights) wires. The output side of the box, which goes directly to the pins in the plug, are yellow, green, brown, and white--no red.

Here's my problem. I want to hook up a charge line through the plug by using the 12v+ wire from the engine/Vansco loom as a trigger for a relay that will connect directly to the battery via a 30 amp breaker. I thought the red wire from the engine loom to the black box was a 12+ wire, but it does not show voltage with ignition ON/OFF or engine running. There is one other cut white wire left in the loom, but it also does not show voltage with ignition ON/OFF or engine running.

The white wires in the loom have numbers printed on them but not words or abbreviations. There is no "towpwr" mark on any wire. My questions are, where is the 12+ wire in the loom from the Vansco? All the wires have been accounted for yet I cannot find a 12+ source. Am I wrong in thinking the red wire should be 12+?

Any help would be appreciated. I peeled back the loom a short distance but still only found 6 wires total, not 7 as other years might have.
__________________

__________________
Larry, Eileen, and Finley
2004 Alpine 36FDDS
Third motor home, first Alpine, no need for another.
Ljwt330 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 03-25-2019, 03:56 PM   #2
Senior Member
 
Old Scout's Avatar
 
Join Date: Nov 2005
Posts: 4,904
...most folk run a separate wire of sufficient gauge to support 30 amps, or whatever, directly to the coach battery bank [chassis?], with an appropriate inline fuse. The outputs wires from the VANSCO system have limited amps load--like maybe 6 amps each, way too low for a tow vehicle "charge" line....For that matter, the coiled multi-wire connector cable going to your tow vehicle probably doesn't have the right gauge wire to support a charge line either....
__________________

__________________
Old Scout
2003 40' MDTS
Garden Ridge, Texas
Old Scout is offline   Reply With Quote
Old 03-25-2019, 04:34 PM   #3
Senior Member
 
c_oneil's Avatar
 
Alpine Owners Club
Join Date: Dec 2012
Posts: 324
The white 16 ga wire marked TOWPWR originates at the rear Vansco output connector (the lower RH edge of the vansco box) and goes into the wire loom there. It is pin position #35, the last pin in the corner of the connector. See if you have +12V there with the ignition on. If the wires in the loom that you are looking at near the converter box don't have printed labels on them you might be seeing something that a previous owner modified and you may have to open the plastic wire loom cover further to find the upstream splices. I don't see any problem using the TOWPWR wire to trigger a relay for a charge line but like Dean said you will need fusing and appropriate wire gauges all the way to the toad battery.
__________________
Carter & Patty
'05 Alpine Limited 36FDTS + '13 CR-V
FMCA & ACA members
c_oneil is offline   Reply With Quote
Old 03-25-2019, 06:36 PM   #4
Senior Member
 
Ljwt330's Avatar
 
Join Date: Jan 2018
Location: Capistrano Beach, California
Posts: 686
Quote:
Originally Posted by c_oneil View Post
The white 16 ga wire marked TOWPWR originates at the rear Vansco output connector (the lower RH edge of the vansco box) and goes into the wire loom there. It is pin position #35, the last pin in the corner of the connector. See if you have +12V there with the ignition on. If the wires in the loom that you are looking at near the converter box don't have printed labels on them you might be seeing something that a previous owner modified and you may have to open the plastic wire loom cover further to find the upstream splices. I don't see any problem using the TOWPWR wire to trigger a relay for a charge line but like Dean said you will need fusing and appropriate wire gauges all the way to the toad battery.
Yes, I am aware of the Vansco wire gauge limits and want only a trigger for the relay. I plan on using 10 gauge wire with circuit breaker for the charge line. Thank you for the location of the TOWPWR wire, I will look for it by the Vansco output #35
__________________
Larry, Eileen, and Finley
2004 Alpine 36FDDS
Third motor home, first Alpine, no need for another.
Ljwt330 is offline   Reply With Quote
Old 03-26-2019, 06:29 AM   #5
Senior Member
 
Join Date: Nov 2017
Location: Marysville, WA
Posts: 183
I did just as Old Scout suggested.
I ran a #10 wire through a 30amp breaker to the trailer plug. Works great and very simple to wire.
__________________
Angelo & Leslie
2005 Alpine 36FDDS #75268
MARYSVILLE, WA.
Jeep401 is offline   Reply With Quote
Old 03-27-2019, 01:11 PM   #6
Senior Member
 
Join Date: Dec 2009
Location: Reno, NV
Posts: 206
If you run a wire directly from the battery to trailer plug with circuit breaker as I did. Then your trailer charges all the time instead of just when the MH is running. it worked great for me. good luck.
gatorv is offline   Reply With Quote
Old 03-27-2019, 11:21 PM   #7
Senior Member
 
DrDaveMA's Avatar
 
Alpine Owners Club
Join Date: Jun 2007
Location: Lake Wales, FL
Posts: 2,677
Just be sure to put a circuit breaker/fuse at BOTH ends, otherwise in the event of a short you could ruin the unprotected battery.
__________________
Dave, Bobbi and Fenway
2005 38' FDTS Alpine Limited, 2016 Jeep Grand Cherokee Limited
Lake Wales, FL
DrDaveMA is offline   Reply With Quote
Old 03-28-2019, 10:02 AM   #8
Senior Member
 
Ljwt330's Avatar
 
Join Date: Jan 2018
Location: Capistrano Beach, California
Posts: 686
Let me clarify what I have done and what I plan.

I already wired the tow with a 10 ga. line and a 30 amp fuse.

I intend to wire the coach with a relay triggered by an ignition ON source that will connect a 10 ga. line from the battery to the trailer plug, protected by a 30 amp fuse. Just preference as I don't want a constant HOT at the plug.

My coiled cord has only 14 ga. wire for the power. Rather than run a separate charge line to the towed, I'm thinking of reducing the amp fuses on the towed line and coach to 15 amps and connect the two through the cord. I really only want a trickle charge to the towed battery that will help maintain it when it is tapped for the braking device. All power in the towed is OFF during a tow except power to the brake device.

Thoughts are welcome. Perhaps I don't even need any power to the towed as the draw is low, but this is for my peace of mind. If anyone sees pitfalls in this plan, please chime in.
__________________
Larry, Eileen, and Finley
2004 Alpine 36FDDS
Third motor home, first Alpine, no need for another.
Ljwt330 is offline   Reply With Quote
Old 03-28-2019, 10:36 AM   #9
Senior Member


 
Holiday Rambler Owners Club
Join Date: Aug 2015
Posts: 3,968
Larry-

According to this chart, a fuse 20A or lower at each end will take the 14 AWG into account.
__________________
Mark
2008 Holiday Rambler Admiral 30PDD (Ford F-53 chassis)
2009 Honda Fit Sport
l1v3fr33ord1 is online now   Reply With Quote
Old 03-28-2019, 02:57 PM   #10
Senior Member
 
c_oneil's Avatar
 
Alpine Owners Club
Join Date: Dec 2012
Posts: 324
Sounds like you have a good plan working. I have been using 20a fuses to tow my CRV for about 10k miles and it has been fine. I did blow a 15a fuse once at first so I moved up a bit. Without doing the math the only time you would pull much current is if you hooked up the toad when it had a dead battery. The toad braking system draws from the toad battery and then only when it engages the brakes. Fuses are cheaper than melted wires. The worst that can happen if you blow a fuse you may run the battery down and need to jump start it when you unhook.
__________________

__________________
Carter & Patty
'05 Alpine Limited 36FDTS + '13 CR-V
FMCA & ACA members
c_oneil is offline   Reply With Quote
Reply

Tags
tow, wiring



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
Towed trailer wiring vfauto Newmar Owner's Forum 7 11-03-2016 02:26 PM
Do I need a diode on towed wiring? ronspradley Toads and Motorhome Related Towing 49 06-27-2015 07:17 AM
Save Time Installing Your Next Tail Light Wiring Kit With The Demco Towed Connector! RVupgrades Vendor Spotlight (Deals, Announcements & More) 6 02-17-2015 05:36 PM
2014 Ram 1500 towed Demco wiring harness AppleUser Toads and Motorhome Related Towing 3 11-21-2014 05:36 AM
Towed wiring dialh Toads and Motorhome Related Towing 4 03-05-2014 06:18 AM

» Featured Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 04:54 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.